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- Dynamic response (5)
- Shaking table test (5)
- Damping ratio (4)
- Experimental study (3)
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- Coarse-grained soil (2)
- Creep (2)
- Creep characteristics (2)
- Excavation unloading (2)
- Failure approach index (2)
- Freeze-thaw cycles (2)
- Frozen wall (2)
- Geotechnical engineering (2)
- Liquefaction (2)
- Rainfall (2)
- Rainfall infiltration (2)
- Seepage (2)
- Slope stability (2)
- Thickness optimization (2)
- Vacuum preloading (2)
- Weibull distribution (2)
- 3D CT reconstruction (1)
- 3D internal crack (1)
- 3D printing (1)
- 3D-ILC (1)
- A new supporting and retaining structure (1)
- Acceleration (1)
- Acoustic emission (1)
- Active layer (1)
- Air entry value (1)
Articles 1 - 30 of 79
Full-Text Articles in Engineering
Triple-Shear Failure Criteria And Experimental Verification For Unsaturated Soils, Hao Chen, Xiao-Rong Hu
Triple-Shear Failure Criteria And Experimental Verification For Unsaturated Soils, Hao Chen, Xiao-Rong Hu
Rock and Soil Mechanics
Based on the triple-shear failure criterion of materials and the mechanical properties of unsaturated soils, the triple-shear failure criteria of the single stress variable and the double stress variable for unsaturated soils are put forward, and their characteristics are analyzed. The results show that the existing failure criteria for unsaturated soils can be interpreted approximately with the new criteria by changing the influence coefficient b of the principal stress. For loci on the π plane, the failure criteria proposed in this paper cover all the convex regions from the inner boundary of the single-shear failure criterion to the outer boundary …
Intelligent Recognition Of Tunnel Stratum Based On Advanced Drilling Tests, Yu-Wei Fang, Zhen-Jun Wu, Qian Sheng, Hua Tang, Dong-Cai Liang
Intelligent Recognition Of Tunnel Stratum Based On Advanced Drilling Tests, Yu-Wei Fang, Zhen-Jun Wu, Qian Sheng, Hua Tang, Dong-Cai Liang
Rock and Soil Mechanics
The reliable recognition of strata in front of tunnel face is significant for the stability and safety of the tunnel engineering project. Traditional advanced geological forecasting methods could not ensure high identification accuracy, low cost and short construction time simultaneously, and they can’t satisfy the universality of stratum identification under different geological conditions. The advanced forecasting efficiency could be significantly enhanced if the drilling data of surrounding rocks in front of the tunnel face can be obtained while performing the conventional advanced borehole to attain the rock conditions at different drilling depths in real time, which would be convenient and …
Study On Constitutive Model Of Fractured Rock Mass Based On Statistical Strength Theory, Wei Gao, Cheng-Jie Hu, Tian-Yang He, Xin Chen, Cong Zhou, Shuang Cui
Study On Constitutive Model Of Fractured Rock Mass Based On Statistical Strength Theory, Wei Gao, Cheng-Jie Hu, Tian-Yang He, Xin Chen, Cong Zhou, Shuang Cui
Rock and Soil Mechanics
With the aid of damage mechanics and on the basis of statistical strength theory, a method for establishing the constitutive model of deep fractured rock mass is proposed and verified by laboratory and numerical tests. The fractured rock mass is divided into numerous micro-cubes. The strength of micro-cubes is related to the fracture degree and the strength of each micro-cube is randomly distributed. Thus the strength can be used to reflect the fracture degree of the rock mass. Among them, based on the fact that the work done by friction between fracture surfaces is equal to the strain energy released …
Study On Solid-Liquid Phase Transition Characteristics Of Saturated Sand Based On Large Shaking Table Test On Free Field, Cheng-Shun Xu, Peng-Fei Dou, Xiu-Li Du, Su Chen, Jun-Yan Han
Study On Solid-Liquid Phase Transition Characteristics Of Saturated Sand Based On Large Shaking Table Test On Free Field, Cheng-Shun Xu, Peng-Fei Dou, Xiu-Li Du, Su Chen, Jun-Yan Han
Rock and Soil Mechanics
Based on the large shaking table test of saturated sand on the free field, the dynamic shear stress–strain response of the foundation soil model was obtained by using the linear interpolation method according to the data from accelerometer arrays. At the same time, the concepts of apparent viscosity and zero shear viscosity of non-Newtonian fluid based on the assumption of hydrodynamic theory were introduced to study the characteristics and behaviors of shear thinning after site liquefaction. The characteristics of solid-liquid phase transition of saturated sand under seismic load were studied. Results showed that when the saturated sand was stimulated by …
A Theoretical Study Of Porosity Characteristics On The Excavation Face Of Slurry Shield In Sand Stratum, Jia-Hua Mao, Da-Jun Yuan, Jiang-Xiao Yang, Bing Zhang
A Theoretical Study Of Porosity Characteristics On The Excavation Face Of Slurry Shield In Sand Stratum, Jia-Hua Mao, Da-Jun Yuan, Jiang-Xiao Yang, Bing Zhang
Rock and Soil Mechanics
To maintain the stability of excavation face in slurry shield, a filter cake must be timely formed during the excavation work. With the filter cake, the slurry pressure can counteract the earth pressure and water pressure in the excavation stratum. In this study, a mathematical model of slurry penetration under constant pressure in sand stratum is established by considering the filtration effect. By means of this model, the influence of penetration time, slurry concentration, slurry pressure and initial stratum porosity on soil porosity and filter cake formation is analyzed. Combining the periodic disturbance of cutting-tools, the variation of soil porosity …
Dynamic Response Of Pile Foundation Under Pile-Soil-Fault Coupling Effect In Meizoseismal Area, Jing-Bin He, Zhong-Ju Feng, Yun-Xiu Dong, Hai-Bo Hu, Chuang Liu, Sui-Zhu Guo, Cong Zhang, Min Wu, Zhen Wang
Dynamic Response Of Pile Foundation Under Pile-Soil-Fault Coupling Effect In Meizoseismal Area, Jing-Bin He, Zhong-Ju Feng, Yun-Xiu Dong, Hai-Bo Hu, Chuang Liu, Sui-Zhu Guo, Cong Zhang, Min Wu, Zhen Wang
Rock and Soil Mechanics
In order to study the dynamic response characteristics of pile foundation under the pile-soil-fault coupling effect, four different types of seismic waves with the peak acceleration of 0.35g are selected for shaking table test. The acceleration response, relative displacement of pile top, bending moment of pile body and damage of pile foundation under different types of seismic waves are studied. The test results show that the parameters of the pile in hanging wall are obviously larger than those in the footwall of the fault, showing the hanging wall effect. The peak acceleration of pile top is greater than that of …
Continuum-Discontinuum Simulation Of Effects Of Internal Friction Angle On Local Fracture Of Circular Cavern Surrounding Rock Under Hydrostatic Pressure, Xue-Yuan Bai, Xue-Bin Wang, Qin Shu
Continuum-Discontinuum Simulation Of Effects Of Internal Friction Angle On Local Fracture Of Circular Cavern Surrounding Rock Under Hydrostatic Pressure, Xue-Yuan Bai, Xue-Bin Wang, Qin Shu
Rock and Soil Mechanics
In order to simulate the transition of rock from continua to discontinua more accurately and reduce the mesh dependence, an element splitting method is developed based on the continuum-discontinuum method where the Lagrangian element method is coupled with discrete element method. The computational domain is discretized into high-precision quadrilateral elements; after cracking, the cracks can propagate along the diagonal lines of quadrilateral elements and the edges of triangular or quadrilateral elements. Deformation-cracking processes of the Brazilian disc rock specimen, uniaxial compression rock specimen and surrounding rocks under hydrostatic pressure are simulated. The following results are found. (1) For the Brazilian …
Stability Analysis Of An Underground Powerhouse On The Left Bank Of The Baihetan Hydropower Station Based On Discrete Element Simulation And Microseismic Monitoring, Hao-Yu Mao, Nu-Wen Xu, Biao Li, Yi-Lin Fan, Jia-Yao Wu, Guo-Tao Meng
Stability Analysis Of An Underground Powerhouse On The Left Bank Of The Baihetan Hydropower Station Based On Discrete Element Simulation And Microseismic Monitoring, Hao-Yu Mao, Nu-Wen Xu, Biao Li, Yi-Lin Fan, Jia-Yao Wu, Guo-Tao Meng
Rock and Soil Mechanics
To investigate the stability of the surrounding rock during excavation process of the underground caverns at the Baihetan hydropower station, effects of excavation unloading on the deformation and failure of the surrounding rock using the numerical simulation software 3DEC based on DEM (discrete element method) are analyzed. The microseismic monitoring technology is introduced to monitor and analyze micro-fracture evolution inside the surrounding rock of the caverns in real time, and the numerical simulation results are compared with the microseismic monitoring data. In order to verify the accuracy of numerical simulation and microseismic monitoring results, the spatiotemporal evolution law of the …
Study On Bearing Behavior Of Flexible Single Pile Subject To Horizontal And Uplift Combined Load, Lei Zhang, Wei-Shen Hai, Hao Gan, Wei-Ping Cao, Tie-Hang Wang
Study On Bearing Behavior Of Flexible Single Pile Subject To Horizontal And Uplift Combined Load, Lei Zhang, Wei-Shen Hai, Hao Gan, Wei-Ping Cao, Tie-Hang Wang
Rock and Soil Mechanics
In order to study the bearing behavior of a flexible single pile under combined horizontal and uplift loading, two groups of structural testing, comprised of 6 pile models in total have been carried out. The results show that for a flexible single pile, pre-applied uplift load with a magnitude smaller than half of pure uplifting capacity(Tu1) lead to significant improvement of ultimate horizontal bearing capacity, achieving greater horizontal resistance compared to pure ultimate horizontal bearing capacity (Hu1) Additionally, it has been observed that this horizontal bearing capacity increases initially but decreases subsequently under further increasing uplift load. This load increasing …
An Elastoplastic Model For Energy Soils Considering Filling And Bonding Effects, Qing-Meng Yuan, Liang Kong, Ya-Peng Zhao
An Elastoplastic Model For Energy Soils Considering Filling And Bonding Effects, Qing-Meng Yuan, Liang Kong, Ya-Peng Zhao
Rock and Soil Mechanics
The filling and bonding effects of hydrate increase the compactness and strength for gas hydrate-bearing sediments(GHBS), which makes the GHBS exhibiting properties similar to dense sand or cemented soil. Under the frame of unified hardening model of clay and sand (CSUH model), the mechanical properties of GHBS are summarized firstly, and a compressive hardening parameter is introduced to describe the isotropic compression characteristics of GHBS under the double influences of filling and bonding of hydrate. A bonding parameter is put forward to modify the yield function, and an evolution rule of bonding effect is also proposed. The state parameters are …
Integration And High Precision Intelligence Microseismic Monitoring Technology And Its Application In Deep Rock Engineering, Bing-Rui Chen, Xia-Ting Feng, Qi-Qing Fu, Bo Wang, Xin-Hao Zhu, Tao Li, Cai-Ping Lu, Huan Xia
Integration And High Precision Intelligence Microseismic Monitoring Technology And Its Application In Deep Rock Engineering, Bing-Rui Chen, Xia-Ting Feng, Qi-Qing Fu, Bo Wang, Xin-Hao Zhu, Tao Li, Cai-Ping Lu, Huan Xia
Rock and Soil Mechanics
It has been popular and difficult for scientists and engineers to acquire more microseismic information, automatically identify microseismic data of rock rupture, locate the location of rock rupture automatically and accurately, and provide theoretical and technical support for disaster analysis, early warning, and prevention and control. In view of these difficulties, an integrated and high precision intelligence microseismic monitoring technology was developed. In the microseismic monitoring technology, several innovation techniques are developed, which include that a sensing-acquisition-transmission technology was integrated; the acquisition technology with noise reduction of 32 bits A/D coupled with electric components was established; integrated identification method of …
Experimental Study On Surrounding Rock Deformation And Acoustic Emission Characteristics Of Rectangular Roadway Under Different Loads, Gong-Yu Hou, Hao-Yong Jing, Jin-Ping Liang, Jin-Xin Tan, Yong-Kang Zhang, Xi Yang, Xin Xie
Experimental Study On Surrounding Rock Deformation And Acoustic Emission Characteristics Of Rectangular Roadway Under Different Loads, Gong-Yu Hou, Hao-Yong Jing, Jin-Ping Liang, Jin-Xin Tan, Yong-Kang Zhang, Xi Yang, Xin Xie
Rock and Soil Mechanics
To investigate the unloading deformation, failure and acoustic emission characteristics during excavation of rectangular roadway under different initial geostresses, excavation unloading model tests were carried out on casted surrounding-rock specimens made of cement mortar. The deformation and failure characteristics of the roof, corner and surrounding rock as well as the evolution characteristics of AE impact count, damage variable and frequency spectrum were obtained. Experimental results showed that: 1) The failure of rectangular roadway was mainly caused by the radial tension strain of the roof and surrounding rock, and the tangential compression strain of the corner. The deformation characteristics of the …
Experimental Study On Critical Dynamic Stress Of Coarse-Grained Soil In Railway Subgrade
Experimental Study On Critical Dynamic Stress Of Coarse-Grained Soil In Railway Subgrade
Rock and Soil Mechanics
The coarse-grained soil is widely used as the filling in the railway subgrade, which is directly subjected to the long-term effect of the dynamic cyclic train loads transmitted from the track structure. Investigation of its dynamic behavior and plastic deformation characteristics under the dynamic train loads may provide ideas for the subgrade performance evaluation and settlement control. GDS dynamic triaxial tests were used to investigate the dynamic response of coarse-grained soil in railway subgrade. By introducing the plastic strain rate and shakedown theory, the evolution law of axial plastic strain of subgrade under different frequencies, confining pressures and cyclic dynamic …
Experimental Study On Evolution Characteristics Of Water And Mud Inrush In Fault Fractured Zones, Qing-Yan Zhang, Wei-Zhong Chen, Jing-Qiang Yuan, Liu-Qi Liu-Qi, Chi Rong
Experimental Study On Evolution Characteristics Of Water And Mud Inrush In Fault Fractured Zones, Qing-Yan Zhang, Wei-Zhong Chen, Jing-Qiang Yuan, Liu-Qi Liu-Qi, Chi Rong
Rock and Soil Mechanics
To investigate the mechanism of water and mud inrush in water-rich fault fracture zones, a large-scale indoor water and mud inrush test system considering mass transfer and geostress state is developed. The simulation test of water and mud inrush disasters evolution process in the fault fracture zone with different hydraulic loading modes and medium parameters of fracture zones are carried out using the device. Some findings are as follows: 1) Evolution of water and mud inrush disasters in fault fractured zones is a strong coupling process of seepage and erosion. In the beginning, fine particles in the filling of fracture …
Quantitative Research On Morphological Characteristics Of Hysteretic Curves Of Remolded Weak Expansive Soil Under Cyclic Loading, Xin-Shan Zhuang, Han-Wen Zhao, Jun-Xiang Wang, Yong-Jie Huang, Zhi Hu
Quantitative Research On Morphological Characteristics Of Hysteretic Curves Of Remolded Weak Expansive Soil Under Cyclic Loading, Xin-Shan Zhuang, Han-Wen Zhao, Jun-Xiang Wang, Yong-Jie Huang, Zhi Hu
Rock and Soil Mechanics
A series of cyclic triaxial tests is conducted by GDS apparatus to investigate the effects of confining pressure, loading frequency, consolidation stress ratio on the hysteretic curves of the remolded weak expansive soil under multi-step loadings and single-step loadings respectively. Morphological characteristics of hysteretic curves are quantitatively described by three parameters, namely, the area S of the hysteretic curve, the slope of curve k, center offset distance d of adjacent hysteretic curves, and the degree of closure εp. The results show that the S, d and εp of the hysteretic curve of weak expansive soils increase nonlinearly with the increase …
Analysis Of The Nonlinearity Of Coefficient Of Earth Pressure At Rest And Its Calculation Method For Coarse-Grained Soils, Zhao-Sheng Yu, Xiao-Bin Chen, Jia-Sheng Zhang, Liang Dong, M S Abdoulkader
Analysis Of The Nonlinearity Of Coefficient Of Earth Pressure At Rest And Its Calculation Method For Coarse-Grained Soils, Zhao-Sheng Yu, Xiao-Bin Chen, Jia-Sheng Zhang, Liang Dong, M S Abdoulkader
Rock and Soil Mechanics
The acquisition of a precise coefficient of earth pressure at rest (K0) is very important for earth pressure calculation, and the study of nonlinear characteristics of K0 has great practical significance. Nevertheless, the research on nonlinearity of K0 for coarse-grained soils has long been neglected. To fill the gap, this study presents a detailed analysis of the nonlinearity characteristics of K0 for coarse-grained soils. Based on the incremental stress-strain relation of Duncan-Chang model, we establish the mathematical formula of K0, and the sensitivity analysis of the K0 formula is presented. The proposed method is applied to predict the K0 of …
Research On Surface Frost Heave And Thaw Settlement Law And Optimization Of Frozen Wall Thickness In Shallow Tunnel Using Freezing Method, Li-Fu Zheng, Yong-Tao Gao, Yu Zhou, Shu-Guang Tian
Research On Surface Frost Heave And Thaw Settlement Law And Optimization Of Frozen Wall Thickness In Shallow Tunnel Using Freezing Method, Li-Fu Zheng, Yong-Tao Gao, Yu Zhou, Shu-Guang Tian
Rock and Soil Mechanics
There are strict requirements on surface displacement caused by frost heaving and thawing settlement for the shallow tunnels. To improve the frozen wall design of the contact channel in Zhuhai Urban-Airport Interity Railway transit project, the finite difference numerical calculation method is used to simulate the whole process of the artificial ground freezing method based on the thermal-mechanical coupling theory. The optimal design of the thickness of the frozen wall is achieved by comparing the surface displacement of frost heaving, thaw settlement and the deformation of the tunnel segment in models with different frozen wall thicknesses. Results show that: 1) …
Experimental Study On Bearing Characteristics Of Bolt-Grouting In Shallow Fractured Surrounding Rock Of Roadway, Rui Pan, Hua Cheng, Lei Wang, Feng-Yun Wang, Yi Cai, Guang-Yong Cao, Peng Zhang, Hao-Jie Zhang
Experimental Study On Bearing Characteristics Of Bolt-Grouting In Shallow Fractured Surrounding Rock Of Roadway, Rui Pan, Hua Cheng, Lei Wang, Feng-Yun Wang, Yi Cai, Guang-Yong Cao, Peng Zhang, Hao-Jie Zhang
Rock and Soil Mechanics
To clarify the bearing characteristics of bolt-grouting support in shallow fractured surrounding rock of roadway, comparative bolt-grouting bearing capacity test was carried out with different rock particle sizes, lithologies, and number of bolts. The results show that: 1) the bearing capacity of the bolt-grouting increases first and then decreases with increasing the particle size. Compared with the non-anchored specimens under the same conditions, the peak stress of the anchored specimens increases by 53.38% on average, and the peak strain decreases by 46.43% on average. 2) Under anchored condition, the free surface opposite to the supporting surface and its vicinity are …
Investigation Of The Rock Similar Material Proportion Based On Orthogonal Design And Its Application In Base Friction Physical Model Tests, Yi-Bing Ning, Hui-Ming Tang, Bo-Cheng Zhang, Pei-Wu Shen, Guang-Cheng Zhang, Ding Xia
Investigation Of The Rock Similar Material Proportion Based On Orthogonal Design And Its Application In Base Friction Physical Model Tests, Yi-Bing Ning, Hui-Ming Tang, Bo-Cheng Zhang, Pei-Wu Shen, Guang-Cheng Zhang, Ding Xia
Rock and Soil Mechanics
On the basis of iron barites sand cementation material, clay was added as the plasticizer and the weight ratio of clay to aggregates plus clay, the weight ratio of iron ore powder plus barite powder to aggregates, the weight ratio of iron ore powder to iron ore powder plus barite powder, and the weight ratio of gypsum to mixture were selected as four factors with five variable levels. Twenty five schemes of the material mixture ratio were designed using orthogonal design method, and related laboratory tests were conducted to obtain physical and mechanical parameters of similar materials such as density, …
Physical Experimental Study On Excavation Disturbance Of Tbm In Deep Composite Strata, Lin-Ken Shi, Hui Zhou, Ming Song, Jing-Jing Lu, Chuan-Qing Zhang, Xin-Jing Lu
Physical Experimental Study On Excavation Disturbance Of Tbm In Deep Composite Strata, Lin-Ken Shi, Hui Zhou, Ming Song, Jing-Jing Lu, Chuan-Qing Zhang, Xin-Jing Lu
Rock and Soil Mechanics
In view of the alternating change of soft and hard rock mass in the work face, physical model test and numerical simulation were conducted to investigate the dynamic response of tunnel surrounding rock during the process of TBM excavation in composite strata at the Lanzhou water source construction project. Similar composite rock mass materials with different strength ratios of surrounding rock were prepared by performing analogous proportion experiments. The fiber grating technology was used to capture the strain evolution law of surrounding rock in composite strata during tunnel excavation, and the macroscopic fracture morphology of the surrounding rock of the …
Hysteresis Effect And Damping Characteristics Of Shale Under Saturated And Natural States, Chang-Bao Jiang, Cai Wei, Min-Ke Duan, Yu-Fei Chen, Tang Yu, Zheng-Ke Li
Hysteresis Effect And Damping Characteristics Of Shale Under Saturated And Natural States, Chang-Bao Jiang, Cai Wei, Min-Ke Duan, Yu-Fei Chen, Tang Yu, Zheng-Ke Li
Rock and Soil Mechanics
An RLW-2000 micro-computer servo-control rock triaxial testing machine was used to carry out triaxial cyclic loading and unloading experiments of saturated and natural shales under different confining pressures. The mechanical properties and hysteresis effects of two hydrated shales were analyzed. The evolution law of the damping ratio was discussed based on the energy principle. The experimental results show that as the cycle number increases, the cumulative residual strain increases gradually. The relative residual strain decreases first and then tends to a stable region, and finally increases rapidly prior to the rock damage. The deformation modulus of the saturated shale is …
Response Of Hydrothermal Activity In Different Types Of Shallow Soil To Rainfall In Permafrost Region, Ming-Li Zhang, Zhi Wen, Jian-Hua Dong, De-Kai Wang, Guo-Dong Yue, Bin Wang, Qiang Gao
Response Of Hydrothermal Activity In Different Types Of Shallow Soil To Rainfall In Permafrost Region, Ming-Li Zhang, Zhi Wen, Jian-Hua Dong, De-Kai Wang, Guo-Dong Yue, Bin Wang, Qiang Gao
Rock and Soil Mechanics
In order to understand the hydrothermal activity mechanism of active layers to rainfall in permafrost regions caused by humidification of climate, the differences of ground surface energy balance and hydrothermal activity in different types of shallow soil with the consideration of rainfall were discussed. Based on the meteorological data in 2013 observed at Beiluhe observation station of Tibet Plateau, three types of shallow ground soil (i.e., sandy soil, sandy loam and silty clay) were selected to compare the differences in the water content and energy balance at the ground surface, dynamic processes of water and energy transport in active layers …
Measurement And Curve Fitting For The Soil-Waterer Characteristic Curve Of Mural Plaster At Mogao Grottoes, Wen-Wu Chen, Quan-Quan Jia, Yan-Mei Tong
Measurement And Curve Fitting For The Soil-Waterer Characteristic Curve Of Mural Plaster At Mogao Grottoes, Wen-Wu Chen, Quan-Quan Jia, Yan-Mei Tong
Rock and Soil Mechanics
Mural plaster deterioration poses great threat to the long-term preservation and daily maintenance. The migration of soluble salts by moisture movement is one of the most important factors that causes mural plaster deterioration. The plaster plays an important role in supporting the murals. The soil-water characteristic of the mural plaster is related to the formation and development of mural deterioration. In order to study the soil-water characteristic curve (SWCC) of mural plaster in full suction range, laboratory reconstituted plasters were prepared by the same materials as the mural plaster in Mogao Grottoes, and the pressure plate test method and vapor …
Model Test On Dewatering Of High-Water-Content Dredged Slurry By Flocculation- Horizontal Vacuum Two-Staged Method, He-Fu Pu, You-Fu Pan, Dibangar Khoteja, Yang Zhou
Model Test On Dewatering Of High-Water-Content Dredged Slurry By Flocculation- Horizontal Vacuum Two-Staged Method, He-Fu Pu, You-Fu Pan, Dibangar Khoteja, Yang Zhou
Rock and Soil Mechanics
A two-stage method for dewatering high-water-content dredged slurry by flocculation and vacuum-assisted prefabricated horizontal drain (PHD) was proposed to increase the dewatering efficiency by addressing the issues of serious bending and clogging that are typically encountered when using the prefabricated vertical drain (PVD). Firstly, comparison of model tests using PVD and PHD, respectively, under vacuum preloading indicates that the PHD has advantages of uniform settlement of soil, negligible bending of the drain board, uniform dewatering rate and better dewatering efficacy. For the cases considered in this study, the mass of water drained out by PVD was only 77.4% of that …
An Experimental Study Of Creep Characteristics Of Sliding Zone Soil Of Huangtupo Landslide Under Different Consolidation Stresses, Qiong Chen, De-Shan Cui, Jing-E Wang, Qing-Bing Liu
An Experimental Study Of Creep Characteristics Of Sliding Zone Soil Of Huangtupo Landslide Under Different Consolidation Stresses, Qiong Chen, De-Shan Cui, Jing-E Wang, Qing-Bing Liu
Rock and Soil Mechanics
In order to study the creep characteristics of the sliding zone soil of the Huangtupo landslide under different consolidation stresses, the unidirectional load, load–unload, load–unload–reload tests were used to consolidate the sliding zone soil, and then the shear creep tests of the sliding zone soils in different consolidation states were carried out. The experimental results showed that the initial void ratio of the sliding zone soil was 0.49 and the compressibility coefficient a1-2 was between 0.37 and 0.45 MPa–1, belonging to the moderate compressibility soil. After unidirectional loading to the predetermined pressure, the void ratio of sliding zone soil reached …
Prediction And Classification Of Rock Mass Boreability In Tbm Tunnel, Xin-Lin Wu, Xiao-Ping Zhang, Quan-Sheng Liu, Wei-Wei Li, Ji-Min Huang
Prediction And Classification Of Rock Mass Boreability In Tbm Tunnel, Xin-Lin Wu, Xiao-Ping Zhang, Quan-Sheng Liu, Wei-Wei Li, Ji-Min Huang
Rock and Soil Mechanics
Due to the extremely high sensitivity of tunnel boring machine（TBM）performance to rock mass conditions and its huge early investment, it is of great value to evaluate the rock mass boreability and predict the TBM performance. In this study, about 300 sets of field data from China and Iran are collected, covering three different rock types and 5 TBM tunnels. FPI (field penetration index) is selected as the evaluation index of rock mass boreability. Specifically, the relationships between rock uniaxial compressive strength(UCS), rock mass integrity index , angle between main structural plane of rock mass and axis of the tunnel ?, …
Simulations Of Temperature Effects On Seepage And Deformation Of Coal Micro- Structure Based On 3d Ct Reconstruction, Gang Wang, Xiang-Jie Qin, Cheng-Hao Jiang, Zhen-Yu Zhang
Simulations Of Temperature Effects On Seepage And Deformation Of Coal Micro- Structure Based On 3d Ct Reconstruction, Gang Wang, Xiang-Jie Qin, Cheng-Hao Jiang, Zhen-Yu Zhang
Rock and Soil Mechanics
In order to investigate the influence of temperature in deep coal mining area on coal seepage and pore fracture structure deformation, 3D CT reconstruction technology and ANSYS were used to simulate the process of conjugate heat transfer and thermal deformation of coal microstructure respectively. The conjugate heat transfer simulation results show that water was initially injected into the 80℃ coal wall at 20℃ was heated to 37.13℃ when it flows out. The temperature of the coal gradually decreases along the wall facing the fluid center. Pore fracture structure has an important influence on the velocity and the temperature of the …
Analysis Of One-Dimensional Thermal Consolidation Of Saturated Soil Considering Heat Conduction Of Semi-Permeable Drainage Boundary Under Varying Loading, De-An Sun, Yao Xue, Lei Wang
Analysis Of One-Dimensional Thermal Consolidation Of Saturated Soil Considering Heat Conduction Of Semi-Permeable Drainage Boundary Under Varying Loading, De-An Sun, Yao Xue, Lei Wang
Rock and Soil Mechanics
In order to study the influence of the temperature change on the consolidation for saturated soils, this paper presents a semi-analytical solution to the one-dimensional thermal consolidation equations considering the heat conduction of the semi- permeable drainage boundary on basis of the seepage and heat transfer equations. The semi-analytical solutions of excess pore pressure, temperature difference and soil settlement are firstly derived by using the Laplace transform upon the one-dimensional thermal consolidation equations considering the coupled and uncoupled thermo-mechanical models, respectively. Then the analytical solutions for a given time domain are obtained by the Crump’s method. Verification is conducted by …
Investigation Of Mode I-Ii-Iii Fracture Of Brittle Spheres With A 60° Internal Crack Using 3d-Ilc, Hai-Jun Wang, Shu-Yang Yu, Zi-Xuan Tang, Lei Tang, Ran Ren, Jin Xu
Investigation Of Mode I-Ii-Iii Fracture Of Brittle Spheres With A 60° Internal Crack Using 3d-Ilc, Hai-Jun Wang, Shu-Yang Yu, Zi-Xuan Tang, Lei Tang, Ran Ren, Jin Xu
Rock and Soil Mechanics
As one of the perfect geometries in nature, sphere is common in daily and industrial life. The mechanical properties of sphere are of great significance to engineering safety and numerical simulation. Internal cracks or defects are inherent properties of materials and have an important influence on the mechanical properties of materials. However, the internal crack of the sphere is not considered in the current research due to the limit of technology. Thus, understanding of the propagation of internal cracks of brittle spheres is limited. In our study, internal cracks were created in glass sphere samples by 3D-ILC (3D-internal laser-engraved crack). …
Centrifugal Shaking Table Test On Dynamic Response Characteristics Of Tunnel Entrance Slope In Strong Earthquake Area, Yang Ren, Tian-Bin Li, Lin Lai
Centrifugal Shaking Table Test On Dynamic Response Characteristics Of Tunnel Entrance Slope In Strong Earthquake Area, Yang Ren, Tian-Bin Li, Lin Lai
Rock and Soil Mechanics
The investigation of tunnel damage after strong earthquake shows that the seismic damage of tunnel entrance is quite serious, so it is necessary to further investigate the dynamic response of tunnel entrance slope. Taking the typical tunnel entrance slope in Wenchuan earthquake area as an example, the dynamic response characteristics of tunnel entrance slope under strong earthquake are studied using large centrifugal shaking table test. The experimental results show that: 1) The acceleration amplification on the slope and inside the slope has a significant elevation effect, the acceleration amplification coefficient of the tunnel arch roof is larger than that of …