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Articles 31 - 60 of 427
Full-Text Articles in Geotechnical Engineering
Shaking Table Test Study On The Influence Of Seismic History On Liquefaction Resistance Of Soils At Different Depths, Xiao-Lei Wang, Li-Teng Liu, Run Liu, Li-Bo Liu, Lin Dong, Hai Ren
Shaking Table Test Study On The Influence Of Seismic History On Liquefaction Resistance Of Soils At Different Depths, Xiao-Lei Wang, Li-Teng Liu, Run Liu, Li-Bo Liu, Lin Dong, Hai Ren
Rock and Soil Mechanics
Earthquake-induced liquefaction can cause significant damage to geotechnical structures, and the aftershocks accompanying the earthquakes may cause the sandy soils to liquefy again. To investigate the effect of free-field subsurface seismic history on the liquefaction resistance of saturated sandy soils at various depths, a series of shaking table tests was designed and conducted. Four shaking events with different accelerations, subdivided into seven smaller events, were input to the sandy soil in the tests. The excess pore pressure ratio, acceleration response, and soil settlement were calculated and compared for each vibration event to investigate the variation laws of soil liquefaction resistance …
Dynamic Response And Effect Of Loading Rate Of Soil Under Impact Loading, Yong-Jian Liu, Yang-Pan Fu, Ming-Yang Lai, Zhang-Ming Li, Hao-Yuan Fang, Zhi-Kun Xie
Dynamic Response And Effect Of Loading Rate Of Soil Under Impact Loading, Yong-Jian Liu, Yang-Pan Fu, Ming-Yang Lai, Zhang-Ming Li, Hao-Yuan Fang, Zhi-Kun Xie
Rock and Soil Mechanics
To study the dynamic response characteristics of soil under impact load, plate dynamic load tests (PDLT) with different load levels and loading rates were carried out on two typical soils (sand and clay) in Guangzhou University Town by using the self-developed additional excitation force-type PDLT system, obtaining three characteristic curves of load-time curve, displacement-time curve, and load-displacement curve, establishing the empirical formula of dynamic deformation modulus and loading rate, and comparing the effects of loading rate of the two soils under impact load. It shows that: (1) There is a threshold of charging voltage in the PDLT test of sand. …
Lining–Stratum Interaction Mechanism Of Mountain Tunnel Based On Static Pushover Model Test, Qin-Wu Lu, Zhen-Chang Guan, Lin Lin, Shu-Jing Wu, De-Jie Song
Lining–Stratum Interaction Mechanism Of Mountain Tunnel Based On Static Pushover Model Test, Qin-Wu Lu, Zhen-Chang Guan, Lin Lin, Shu-Jing Wu, De-Jie Song
Rock and Soil Mechanics
With the rapid development of traffic infrastructure construction in western mountain area, the lining-stratum interaction mechanism of mountain tunnel under seismic effects has attracted increasing attentions. Based on the prototype of a regular two-lane highway tunnel section with V-grade surrounding rock, a static pushover model test for mountain tunnel was conducted. The variations of stratum displacement, stratum strain and ground pressure with pushover distance were carefully studied, and the lining-stratum interaction mechanism was thoroughly discussed. The test results show that: the lining-stratum interaction can be generally divided into compacting stage, overturning stage, and dragging stage. The stratum tends to circumferentially …
Temperature Effect On Water Retention Capacity Of Nanning Expansive Soil And Its Microscopic Mechanism, Zhao-Tian Zeng, Zhe-Qi Cui, De-An Sun, Zhi Yao, Bin Pan
Temperature Effect On Water Retention Capacity Of Nanning Expansive Soil And Its Microscopic Mechanism, Zhao-Tian Zeng, Zhe-Qi Cui, De-An Sun, Zhi Yao, Bin Pan
Rock and Soil Mechanics
To explore the variation of water retention capacity of expansive soil at different temperatures, the calibration curves of Whatman No.42 filter paper were measured by vapor equilibrium method at 5, 25, 40 ℃ and 60 ℃, and the bilinear calibration equation considering temperature effect was established. The results show that the water retention capacity of the filter paper decreases with the increase of temperature, and the effect on the high suction section of calibration curve is weaker than the low suction section. On this basis, Nanning expansive soil is taken as the research object, and the soil-water characteristic curves of …
Effects Of Skeleton Void Ratio On The Strength And Deformation Characteristics Of Coarse-Grained Soil, Jia-Jun Pan, Xiang-Jun Sun, Yong-Zhen Zuo, Jun-Peng Wang, Yi-Wei Lu, Bing Han
Effects Of Skeleton Void Ratio On The Strength And Deformation Characteristics Of Coarse-Grained Soil, Jia-Jun Pan, Xiang-Jun Sun, Yong-Zhen Zuo, Jun-Peng Wang, Yi-Wei Lu, Bing Han
Rock and Soil Mechanics
The strength and deformation characteristics of coarse-grained soil are closely related to the initial gradation and dry density during specimen preparation. To study the strength and deformation characteristics of coarse-grain materials with different gradations and densities, a simple and generalized method for calculating the skeleton void ratio of coarse-grained soil is proposed. The results of laboratory tests show that there is an obvious monotonic variation between the skeleton void ratio obtained by this calculation method and the mechanical properties of coarse-grained soil. When the specimen size is consistent, with the decrease of the skeleton void ratio, the failure shear stress …
A Study About The Influence Of Joint Roughness On The Volume Of Rock Blocks, Tie-Xin Liu, Jia-Qi Li, Jian-Hui Deng, Zheng-Hu Zhang, Jun Zheng
A Study About The Influence Of Joint Roughness On The Volume Of Rock Blocks, Tie-Xin Liu, Jia-Qi Li, Jian-Hui Deng, Zheng-Hu Zhang, Jun Zheng
Rock and Soil Mechanics
The structure of a rock mass directly controls its mechanical and hydraulic properties, and the distribution of rock block volumes can directly reflect the structural characteristics of the rock mass. Currently, many studies simplify the joint surfaces as planes and ignore the influence of roughness on the volume of rock blocks. In this study, the Hurst exponent (H) and root-mean-square height (Rq) were used to characterize joint roughness, and the influence of joint roughness on the quantity and volume distribution of rock blocks was investigated. The results show that: (1) H and Rq control the roughness of the joint, and …
A Calculation Method For Deformation Of Diaphragm Wall Of Narrow Deep Foundation Pit In Soft Soil Considering Spatio-Temporal Effect, Kun-Yong Zhang, Meng Zhang, Bin Sun, Fu-Dong Li, Yong-Zhou Jian
A Calculation Method For Deformation Of Diaphragm Wall Of Narrow Deep Foundation Pit In Soft Soil Considering Spatio-Temporal Effect, Kun-Yong Zhang, Meng Zhang, Bin Sun, Fu-Dong Li, Yong-Zhou Jian
Rock and Soil Mechanics
To accurately evaluate the safety of foundation pit construction in soft soil area and its impact on the surroundings, the time and space influencing factors during excavation cannot be ignored. In this paper, based on the excavation of a deep foundation pit in the soft soil area of the Yangtze River floodplain, a 3D finite element model was established considering the combination of bottom-up and top-down constructions, and the calculated values of horizontal displacement of the diaphragm wall were compared with the measured values to verify the reliability of the finite element calculation. Based on theoretical analysis, numerical calculation and …
Reliability Analysis Of Rock Tunnel Stability Based On Interval Non-Probability Under Multiple Failure Modes, Xiang Li, Jing-Tong Wang, Heng Wei
Reliability Analysis Of Rock Tunnel Stability Based On Interval Non-Probability Under Multiple Failure Modes, Xiang Li, Jing-Tong Wang, Heng Wei
Rock and Soil Mechanics
For the reliability analysis of rock tunnel stability, considering the difficulty in obtaining the statistical data on rock mass parameters, there is the potential inadequacy when using the probabilistic reliability method; on the other hand, the rock tunnel stability is intimately pertinent to a variety of failure modes, meaning it is necessary to consider the issue on structural system reliability. First, based on the interval theory, the uncertainty parameters were represented by adopting the interval variables. Subsequently, aiming at the coexistence of multiple failure modes in rock tunnel engineering, the concept of structural system reliability was introduced, and then a …
Experimental Study On Sand Anti-Seepage By Microorganism–Bentonite Combined Mineralization, Yu Zhang, Xiang He
Experimental Study On Sand Anti-Seepage By Microorganism–Bentonite Combined Mineralization, Yu Zhang, Xiang He
Rock and Soil Mechanics
The seepage of sandy foundation would lead to the collapse of foundation and the destruction of engineering structure. A series of large-scale sand column seepage model experiments was carried out by using microorganism–bentonite combined mineralization method. The in-depth discussion was conducted for the effects of sand particle size, slurry liquid-to-solid ratio and treatment cycles on the permeability, internal erosion characteristic and bentonite and calcium carbonate precipitate distribution of sand. Moreover, the stability of sealing and the microstructure were thoroughly investigated, and the treatment effect of microorganism–bentonite combined mineralization method was evaluated. It was found that this method could improve the …
Optimal Strut Position Of Deep Foundation Pit With Convex Corner Under Surcharge Of Adjacent Building, Bao-Guo Chen, Zeng-Pan Jia
Optimal Strut Position Of Deep Foundation Pit With Convex Corner Under Surcharge Of Adjacent Building, Bao-Guo Chen, Zeng-Pan Jia
Rock and Soil Mechanics
Since the mechanical behavior of the convex corner is complex due to surcharge near the excavation, it is of great importance to evaluate the influence of changes in strut position on the convex corner. Field monitoring and numerical simulations were used to analyze the influence law of the changes of strut position on the deformation and stress characteristics of the convex corner area. The axial force of inner strut, the lateral earth pressure on the pile, the horizontal displacement of the pile, the settlement of adjacent building and the bending moment of the pile were obtained. The research results show …
Investigation Of The Fracture Process Zone And Behavior Of The Macro-Scale Fatigue Cracks In Brittle Rock Specimens, Nazife Erarslan
Investigation Of The Fracture Process Zone And Behavior Of The Macro-Scale Fatigue Cracks In Brittle Rock Specimens, Nazife Erarslan
Rock and Soil Mechanics
The importance of this study is to explain the fatigue damage mechanism while addressing the effect of fatigue on the fracture toughness (KIC) using the brittle Brazilian specimens and to show for the first time in the literature the behavior of macroscale cracks that open and close in brittle rock without leading to eventual failure. The KIC was reduced by 35% due to the cyclic loading, and the reduction of the indirect Brazilian strength was found to be reduced by 30%. The fatigue cracks were observed to open and close elastically without failure and have been recorded by a camera …
Mode I Crack Morphology And Fracture Surface Roughness Of Granite Under Impact, Xue-Song Wang, Lian-Jun Guo, Xin Liu, Ding Deng, Jiu-Yang Zhang, Zhen-Yang Xu
Mode I Crack Morphology And Fracture Surface Roughness Of Granite Under Impact, Xue-Song Wang, Lian-Jun Guo, Xin Liu, Ding Deng, Jiu-Yang Zhang, Zhen-Yang Xu
Rock and Soil Mechanics
To study the response of mode I cracks under impact loading, the dynamic fracture test on the single cleavage triangle (SCT) granite specimens with the lateral opening was carried out using a split Hopkinson pressure bar test system. The Hough transform method was used to quantitatively describe the distributions of the surface crack lengths and angles, and the relationship between them and the absorbed energy of the specimen was analyzed. The three-dimensional (3D) point cloud data of the fracture surface was obtained by using a 3D surface topography detection device, and a fracture surface reconstruction method based on the threshold …
Upper Bound Analysis Of Uplift Piles In Saturated Clay And Soil Plug Effect, Ke-Wen Zhu, Jian Yu, Mao-Song Huang
Upper Bound Analysis Of Uplift Piles In Saturated Clay And Soil Plug Effect, Ke-Wen Zhu, Jian Yu, Mao-Song Huang
Rock and Soil Mechanics
A new mechanism is established and applied to the upper bound analysis of uplift piles in saturated clay. Upper bound solutions of uplift capacities of closed and open-ended piles are analyzed. The new mechanism is verified by comparing with elastoplastic finiteelement, existing lower bound and API solutions. Its reliability is assessed through case studies including one centrifuge test and two field tests. The effects of the pile length-diameter ratio, pile surface roughness, non uniformity of undrained soil strength and length of soil plug on the uplift bearing capacity are considered. A formulation predicting the net bearing capacity of closed-ended uplift …
Shear Strength Characteristics Of Unsaturated Rubber Silt Mixtures, En-Quan Zhou, Yuan Yao, Lei Cui, Long Wang
Shear Strength Characteristics Of Unsaturated Rubber Silt Mixtures, En-Quan Zhou, Yuan Yao, Lei Cui, Long Wang
Rock and Soil Mechanics
To study the shear strength characteristics of unsaturated rubber silt mixtures, a series of direct shear tests was conducted on the rubber silt mixtures with different rubber particle contents and water contents. Based on the particle contact state theory, the meso contact mode of rubber silt mixtures was constructed, and the calculation method of rubber silt mixtures skeleton void ratio based on different rubber content was obtained. The test results show that the shear strength of rubber silt mixtures decreases with the increase of skeleton void ratio at a low water content, while the strength of rubber silt mixtures increases …
A Simplified Algorithm For Predicting Creep Settlement Of High Fill Based On Modified Power Law Model, Jian Huang, Pu-Rong De, Yang-Ping Yao, Ren Peng, Ji-Lin Qi
A Simplified Algorithm For Predicting Creep Settlement Of High Fill Based On Modified Power Law Model, Jian Huang, Pu-Rong De, Yang-Ping Yao, Ren Peng, Ji-Lin Qi
Rock and Soil Mechanics
The creep settlement dominates the long-term deformation of high fill foundation after construction and cannot be ignored. The reliable prediction of creep settlement provides an important guideline for judging whether settlement is stable and arranging subsequent construction. The modification of the traditional power law model for predicting the one-dimensional creep deformation of soil is proposed, which can describe the one dimensional creep deformation of clay, sand and soil-rock mixture. The modified model satisfies the requirement that the growth of the creep deformation has an asymptote with respect to time; that is to say, the creep deformation grows continually and approaches …
Probabilistic Evaluation Of Excavation Unloading Response Of Rock Slope Considering The Uncertainty Of Mechanical Parameters, Guo-Feng Liu, Kun Feng, Chang-Gen Yan, Guang-Liang Feng, Ding-Ping Xu, Chi Zhou
Probabilistic Evaluation Of Excavation Unloading Response Of Rock Slope Considering The Uncertainty Of Mechanical Parameters, Guo-Feng Liu, Kun Feng, Chang-Gen Yan, Guang-Liang Feng, Ding-Ping Xu, Chi Zhou
Rock and Soil Mechanics
There are many studies on the spatial variability of mechanical parameters of jointed rock masses and the reliability of slopes with potential slip surface, but the research on the spatial variability of mechanical parameters of rock slopes and the uncertainty analysis of excavation unloading response (deformation and plastic zone) is limited. A probabilistic evaluation method for excavation unloading response of rock slopes considering the uncertainty of mechanical parameters is proposed. Based on laboratory rock mechanical tests and geological survey mapping data, the probabilistic statistical models of rock mass mechanical parameters of slopes are constructed by using Hoek-Brown empirical criterion and …
Long-Term Stress Characteristics And Load Reduction Effect Of High-Fill Box Culverts With Eps Slabs, Qi Gao, Bao-Guo Chen, Sen Wu, Shan Yuan, Meng-Yao Sun
Long-Term Stress Characteristics And Load Reduction Effect Of High-Fill Box Culverts With Eps Slabs, Qi Gao, Bao-Guo Chen, Sen Wu, Shan Yuan, Meng-Yao Sun
Rock and Soil Mechanics
Laying expandable polystyrene (EPS) slabs on the top of high-fill box culverts to reduce earth pressure has been used in engineering practice, but the creep of EPS slabs will cause the earth pressure on the box culvert to change over time. The present design theory of box culverts cannot clearly reflect the long-term load reduction effect of EPS slabs and the long-term stress characteristics of box culverts. In this analysis, model tests were carried out to investigate the short-term stress characteristics of the box culvert with EPS slabs, and a numerical model was validated by the model test results. Then …
Simulation Of Seepage And Heat Transfer In 3d Fractured Rock Mass Based On Fracture Continuum Method, Dong-Dong Liu, Li-Xin Wei, Guo-Yuan Xu, Yan-Yong Xiang
Simulation Of Seepage And Heat Transfer In 3d Fractured Rock Mass Based On Fracture Continuum Method, Dong-Dong Liu, Li-Xin Wei, Guo-Yuan Xu, Yan-Yong Xiang
Rock and Soil Mechanics
The main challenge of simulating the processes of seepage and heat transfer in fractured rock mass is the heterogeneity of rock mass at various scales. In order to balance the efficiency and accuracy of numerical simulation, the two-dimensional fracture continuum method is extended to a three-dimensional one. Based on the depth-first search algorithm, the effective fractures contributing to the permeability of rock blocks are collected. The block permeability tensor is obtained by considering the contribution of effective fractures and rock matrix. The finite element software COMSOL Multiphysics is integrated with Matlab to generate a three-dimensional fracture continuum model that contains …
Mechanism Of Liquefaction-Induced Lateral Spreading In Liquefiable Inclined Sites, Ke-Min Jia, Cheng-Shun Xu, Xiu-Li Du, Xiao-Ling Zhang, Jia Song, Zhuo-Lin Su
Mechanism Of Liquefaction-Induced Lateral Spreading In Liquefiable Inclined Sites, Ke-Min Jia, Cheng-Shun Xu, Xiu-Li Du, Xiao-Ling Zhang, Jia Song, Zhuo-Lin Su
Rock and Soil Mechanics
A numerical model of the liquefaction horizontal free-field shaking table test was developed based on the completed large-scale shaking table test of liquefaction horizontal free field using the OpenSees finite element platform, and the numerical model was verified. Based on this, a free-field numerical model of the overall inclined foundation was established, and the non-cyclic dynamic response of the liquefaction lateral spreading site and the mechanism of liquefaction-induced lateral spreading were discussed. The results show that the established numerical model can effectively simulate the seismic response in liquefiable sites. There was significant relative displacement at the interface between liquefiable loose …
Roughness Characterization Of Rock Fracture And Its Influence On Fracture Seepage Characteristics, Lei Gan, Yu Liu, Zong-Liang Zhang, Zhen-Zhong Shen, Hong-Ying Ma
Roughness Characterization Of Rock Fracture And Its Influence On Fracture Seepage Characteristics, Lei Gan, Yu Liu, Zong-Liang Zhang, Zhen-Zhong Shen, Hong-Ying Ma
Rock and Soil Mechanics
Roughness of rock fracture has a significant influence on the seepage characteristics of fracture. The point cloud data of rock fracture surface was collected by three-dimensional (3D) optical scanning system. The joint roughness coefficient (JRC) and surface roughness ratio (Rs) were calculated by SURFER and GEOMAGIC STUDIO, and the quantitative relationship between JRC and Rs was established. The effects of JRC and Rs on the fracture seepage characteristics in limestone were investigated by conducting seepage tests under the coupling effect of stress, seepage and chemical interaction. The results show that JRC is a logarithmic function of Rs, with the R-squared …
Strength Deterioration Characteristics Of Lime-Metakaolin Improved Earthen Site Soil Under Freeze-Thaw Cycles, Xin-Ming Li, Hao-Yang Zhang, Di Wu, Yan-Rui Guo, Ke-Bin Ren, Yun-Zhi Tan
Strength Deterioration Characteristics Of Lime-Metakaolin Improved Earthen Site Soil Under Freeze-Thaw Cycles, Xin-Ming Li, Hao-Yang Zhang, Di Wu, Yan-Rui Guo, Ke-Bin Ren, Yun-Zhi Tan
Rock and Soil Mechanics
The Central Plains are located in an area that experiences seasonal freeze-thaw cycles, which can have significant effects on the soil structure of soil relics. To determine if lime-metakaolin (L-MK) is a feasible alternative to natural hydraulic lime (NHL) for earth site restoration work, tests were conducted using lime, metakaolin and silty sand from the site as main raw materials. Mass loss, unconfined compressive strength and splitting tensile strength tests were carried out on L-MK improved silty sand soil undergoing different numbers of freeze-thaw cycles to study its strength characteristics in depth. X-ray diffraction (XRD) thermogravimetry (TG), and scanning electron …
Improvement Of Rainfall Boundary Treatment Based On The Diffusion Wave Approximation Equation, Xu Wang, Mei Dong, Meng-Yue Kong, Yun-Peng Deng, Ri-Qing Xu, Xiao-Nan Gong
Improvement Of Rainfall Boundary Treatment Based On The Diffusion Wave Approximation Equation, Xu Wang, Mei Dong, Meng-Yue Kong, Yun-Peng Deng, Ri-Qing Xu, Xiao-Nan Gong
Rock and Soil Mechanics
During the simulation of rainwater infiltration, the conventional rainfall boundary cannot accurately reflect the influence of the variation of ponding water depth on the calculation of actual rainwater infiltration rate. To address this issue, the conventional rainfall boundary is improved by incorporating the diffusion wave approximation equation, allowing for the coupling of ponding water depth variations with actual infiltration rate during heavy rainfall events. Additionally, the accuracy of the improved boundary is validated through two classical experimental cases. The improved boundary is subsequently applied to the simulation of an actual engineering scenario. The findings indicate that the improved rainfall boundary …
Three-Dimensional Unified Mechanical Model And Calculation Method Of Uplift Capacity Of Horizontal Rectangular Anchor Plate In The Whole Region In Sand, Wei Hu, Hui Wang, Chen Yao, Dong-Xue Hao, Dan-Da Shi
Three-Dimensional Unified Mechanical Model And Calculation Method Of Uplift Capacity Of Horizontal Rectangular Anchor Plate In The Whole Region In Sand, Wei Hu, Hui Wang, Chen Yao, Dong-Xue Hao, Dan-Da Shi
Rock and Soil Mechanics
Uplift of the horizontal rectangular anchor plate is a typical three-dimensional problem. However, it is difficult to characterize the sliding surface of soil around the anchor plate in the limit state for its shape is affected by a combination of the length-width ratio and embedment ratio of the anchor plate. Combining the results of ABAQUS 3D numerical simulation and 2D sliding surface analysis, it is found that the geometric form of the 3D sliding surface in any horizontal section within its buried depth range can be described by a closed graph, including four segments of straight lines parallel and equal …
Refined Analysis On Stress State Of Cutoff Wall Of High Asphaltic Core Dam On Super-Deep Overburden, De-Gao Zou, Yong-Qian Qu, Xian-Jing Kong, Kai Chen, Jing-Mao Liu, Jin Gong
Refined Analysis On Stress State Of Cutoff Wall Of High Asphaltic Core Dam On Super-Deep Overburden, De-Gao Zou, Yong-Qian Qu, Xian-Jing Kong, Kai Chen, Jing-Mao Liu, Jin Gong
Rock and Soil Mechanics
The concrete cutoff wall is the main anti-seepage structure of the rockfill dam resting on the deep overburden foundation, and is the key to ensuring the dam safety. Therefore, it is of great significance to accurately simulate the stress state of cutoff wall for evaluation of the rockfill dam resting on the deep overburden. Combining the incremental iteration method and the finite element-scaled boundary finite element coupling method (FEM-SBFEM), this paper realizes the trans-scale refined numerical analysis of the stress and deformation of the rockfill dam, which overcomes the low precision of the conventional midpoint increment method in solving local …
Characteristics Of The Cumulative Plastic Deformation And Pore Water Pressure Of Saturated Sand Under Cyclic Intermittent Loading, Qi Yang, Xiao-Ya Wang, Ru-Song Nie, Chen Chen, Yuan-Zheng Chen, Fang Xu
Characteristics Of The Cumulative Plastic Deformation And Pore Water Pressure Of Saturated Sand Under Cyclic Intermittent Loading, Qi Yang, Xiao-Ya Wang, Ru-Song Nie, Chen Chen, Yuan-Zheng Chen, Fang Xu
Rock and Soil Mechanics
The long-term train loads can result in problems such as strength attenuation, excessive cumulative settlement and even subsidence in sandy soil foundations and filling materials, which can jeopardize train operation safety. To understand the mechanism of the disease, it is necessary to explore the cumulative plastic deformation and pore water pressure characteristics of saturated sand under intermittent loading. Therefore, dynamic triaxial tests under continuous and intermittent loading with different dynamic amplitudes and confining pressures were performed. The test results showed that: (1) The cumulative plastic deformation-loading cycle curve of saturated sand exhibited a “zigzag” pattern. The intermittent effect led to …
Experimental Study On The Mechanical Response Of Buried Pipelines Under Different Subsidence Patterns, Yu Zhang, Hao Liang, Liang Lin, You Zhou, Qing-Song Zhao
Experimental Study On The Mechanical Response Of Buried Pipelines Under Different Subsidence Patterns, Yu Zhang, Hao Liang, Liang Lin, You Zhou, Qing-Song Zhao
Rock and Soil Mechanics
The frequent occurrence of buried pipeline accidents caused by the ground collapse and subsidence makes it urgent to carry out experimental studies on the mechanical response under different subsidence effects. A systematical survey of the pipeline strain, earth pressure and soil deformation was conducted considering the effects of ground subsidence and collapse. The result showed that due to the arching effect at the top of the pipeline, the strain and earth pressure firstly increased and then decreased with the extension of the collapse zone, while they increased as the subsidence zone extended during the collapse and settlement. In the subsidence …
Creep–Fatigue Constitutive Model Of Salt Rock Based On A Hardening Parameter, Jin-Yang Fan, Lu-Xuan Tang, Jie Chen, Zhen-Yu Yang, De-Yi Jiang
Creep–Fatigue Constitutive Model Of Salt Rock Based On A Hardening Parameter, Jin-Yang Fan, Lu-Xuan Tang, Jie Chen, Zhen-Yu Yang, De-Yi Jiang
Rock and Soil Mechanics
Salt rock has been recognized as an ideal medium for energy storage or oil and gas storage because of its good creep and self-healing characteristics. Accurate characterization and prediction of the complex mechanical behavior of salt rock is the basis for ensuring the safety of underground space utilization project of salt caverns. Based on proposed parameters of hardening and other characteristic factors, in this study, a new creep–fatigue constitutive model is developed for salt rock considering complex loading and unloading paths. Based on the dislocation mechanism of salt rock deformation, hyperbolic damping elements are introduced as state variables to characterize …
Applicability Of Power-Law Stress-Strain Model For Coral Sand Under Earth Fills Stress Path, Ji-Ru Zhang, Yan-Jun Zheng, Wei-Ke Peng, Lei Wang, Jing-Xin Chen
Applicability Of Power-Law Stress-Strain Model For Coral Sand Under Earth Fills Stress Path, Ji-Ru Zhang, Yan-Jun Zheng, Wei-Ke Peng, Lei Wang, Jing-Xin Chen
Rock and Soil Mechanics
Coral sands are commonly used in hydraulic fill foundations and as subgrade fill in the construction of islands and reefs. The stress paths followed by soil consolidation or filled subgrade are characterized by K0 consolidation or constant stress ratio stress path. It is necessary to develop a computational model that reflects the effect of stress path on deformation in order to accurately estimate soil deformation during the filling process. Based on the generalized Hooke's law, a nonlinear elastic model in the form of a power function is proposed to describe the stress-strain curve of coral sand, and the functional expression …
Mechanical Properties Of Sand 3d Printed Rock-Like Samples Based On Different Post-Processing Methods, Wei Tian, Xiao-Hui Wang, Wei Yun, Xu Cheng
Mechanical Properties Of Sand 3d Printed Rock-Like Samples Based On Different Post-Processing Methods, Wei Tian, Xiao-Hui Wang, Wei Yun, Xu Cheng
Rock and Soil Mechanics
3D printing, a rapid prototyping technology, has great potential for applications in laboratory rock tests, but the low strength and stiffness of 3D printed samples have been one of the key problems that need to be addressed. In order to find a way to enhance the strength and stiffness of 3D printed rock-like samples, GS19 sand and furan resin were selected as printing materials, and sand 3D printed rock-like samples were used as research objects. Based on this, the samples were post-processed using three different methods: vacuum infiltration, low-temperature treatment, and combination of infiltration and low-temperature. Uniaxial compression tests were …
Disintegration Characteristics And Mechanism Of Dispersive Soil Modified By Si/Ca Compound System, Yi-Fei Liu, Ze-Fan Bu, Dong-Ting Cai, Heng-Hui Fan, Zhuo Zhang, Han Ru, Juan-Li Ju
Disintegration Characteristics And Mechanism Of Dispersive Soil Modified By Si/Ca Compound System, Yi-Fei Liu, Ze-Fan Bu, Dong-Ting Cai, Heng-Hui Fan, Zhuo Zhang, Han Ru, Juan-Li Ju
Rock and Soil Mechanics
Dispersive soil has the characteristic of being dispersed and lost when encountering water. In engineering practice, lime and cement are often used to modify dispersive soil, but doing so often has such problems as environmental pollution. The Si/Ca compound system composed of nano silica sol and calcium chloride is selected as the modified material for dispersive soil. The effect of the modification is studied by pinhole test, mud ball test, and dispersion and disintegration test. The mechanism of dispersive soil modified by Si/Ca compound system is explored by physical and chemical properties tests. The results show that the dispersibility of …