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Articles 1 - 30 of 144
Full-Text Articles in Geotechnical Engineering
Evolution Model Of Unsaturated Shear Strength Indices Over A Wide Range Of Saturation, Yu-Xin Zhao, Xu Li, Hong-Fen Zhao, Yan Liu
Evolution Model Of Unsaturated Shear Strength Indices Over A Wide Range Of Saturation, Yu-Xin Zhao, Xu Li, Hong-Fen Zhao, Yan Liu
Rock and Soil Mechanics
The variation of shear strength indices of unsaturated soil with the degree of saturation Sr is complicated. In order to describe the experimental phenomena, the existing literature on the variations of cohesion, internal friction angle and dilation angle with Sr is analyzed. The results show that: (1) When Sr decreases and the pore water gradually transits from capillary water to adsorbed water, the friction angle increases. The turning point can be defined as critical degree of saturation Src. When Sr is greater than Src, the value of the friction angle is constant; when Sr is less than Src, the friction …
Classification And Damage Characteristics Of Complex Secondary Cracks In Granite Residual Soil, Cheng-Sheng Li, Bing-Xin Zhang, Zhi-Jun Liu
Classification And Damage Characteristics Of Complex Secondary Cracks In Granite Residual Soil, Cheng-Sheng Li, Bing-Xin Zhang, Zhi-Jun Liu
Rock and Soil Mechanics
The development of cracks is important to the damage and failure of soil. In order to study the evolution of meso-cracks in granite residual soil with complex geotechnical engineering properties, a series of reconstructed volume images was obtained by using CT to scan the process of the triaxial compression test. The crack volume overlap rate is introduced to improve the crack classification method proposed by the author, and the accuracy of judging the connectivity of the two cracks before and after deformation is improved. The results reveal that the change of crack volume overlap rate has a slight effect on …
Pull-Out Test Study On Mechanical Characteristics Of Geogrid-Aggregate Interface, Mu-Han Yan, Xian-Zhang Ling, Liang Tang, Hong Xiao, Xu-Guo Song
Pull-Out Test Study On Mechanical Characteristics Of Geogrid-Aggregate Interface, Mu-Han Yan, Xian-Zhang Ling, Liang Tang, Hong Xiao, Xu-Guo Song
Rock and Soil Mechanics
Geogrids are often used in the aggregate cushion of the composite foundation to limit the lateral displacement and reduce the differential deformation. It depends on the interaction between geogrids and aggregate particles. In this study, a series of large-size pull-out tests was performed on biaxial and triaxial geogrids embedded in aggregates with three particle-size gradations. The test results showed that higher normal stress, better gradation and more suitable aggregate particle sizes yielded the increase of the pull-out resistance. The classic punching-shear failure model was proven to be valid for explaining the shear effect between transverse ribs of biaxial geogrids and …
Prediction Of Consolidation Coefficient Of Soft Soil Using An Artificial Neural Network Models With Biogeography-Based Optimization, Cai-Jin Wang, Meng Wu, Yang Yang, Guo-Jun Cai, Song-Yu Liu, Huan He, Jian-Xin Chang
Prediction Of Consolidation Coefficient Of Soft Soil Using An Artificial Neural Network Models With Biogeography-Based Optimization, Cai-Jin Wang, Meng Wu, Yang Yang, Guo-Jun Cai, Song-Yu Liu, Huan He, Jian-Xin Chang
Rock and Soil Mechanics
The consolidation coefficient Cv of soft soil is an important parameter in geotechnical engineering. The artificial neural network (ANN) model is improved with the biogeography-based optimization algorithm (BBO). And the artificial neural network with biogeography-based optimization (ANN-BBO) model, trained and tested by using the subgrade soft soil data of the reconstruction and expansion project of Lianyungang–Huai’an expressway, has been adopted to calculate the soft soil consolidation coefficient. Using the correlation coefficient matrix and principal component analysis, eleven physical and mechanical parameters were statistically analyzed, seven of which were identified as input parameters of calculation model which was then trained and …
Effect Of Particle Swelling On Hydraulic Performance And Meso-Mechanism Of Geosynthetic Clay Liners, Juan Hou, Jin-Bang Zhang, Yin-Yu Sun, Rui Sun, Fei-Yu Liu
Effect Of Particle Swelling On Hydraulic Performance And Meso-Mechanism Of Geosynthetic Clay Liners, Juan Hou, Jin-Bang Zhang, Yin-Yu Sun, Rui Sun, Fei-Yu Liu
Rock and Soil Mechanics
The hydraulic performance of geosynthetic clay liners (GCL) is closely related to the swelling characteristics of the bentonite particles and the resulting porous medium. However, there currently needs to be more analysis at the mesoscopic level to understand the permeating mechanisms. A numerical model using COMSOL was developed to study the effects of particle swelling on the effective porosity, tortuosity, and hydraulic conductivity of GCL under deionized water actions. The results demonstrate that the swelling of bentonite particles is a crucial factor influencing the effective porosity, tortuosity, and hydraulic conductivity of GCL. Particle swelling significantly affects the width and number …
Study On The Environmental Durability Of Heavy Metal Contaminated Soil Remediated By Enzyme Induced Carbonate Precipitation, Han-Liang Bian, Pei-Rui Ji, Jun-Ling Wang, Xu-Gang Zhang, Xiang-Chun Xu
Study On The Environmental Durability Of Heavy Metal Contaminated Soil Remediated By Enzyme Induced Carbonate Precipitation, Han-Liang Bian, Pei-Rui Ji, Jun-Ling Wang, Xu-Gang Zhang, Xiang-Chun Xu
Rock and Soil Mechanics
To explore the environmental durability of heavy metal contaminated soil remediated by enzyme induced carbonate precipitation (EICP) technology, acid soaking, freeze-thaw tests, and rainfall tests were carried out on the zinc and lead contaminated soil after EICP remediation, respectively. The durability and influence of the zinc and lead contaminated soil remediated by EICP technique under different environmental conditions and the corresponding influence regularity were discussed in this paper. The results showed that under different concentrations and types of acid solutions, the leaching amount of heavy metal ions in exchangeable and carbonate bound forms in the zinc and lead contaminated soil …
Experimental Study On Rock Joint Permeability Evolution During Plugging Process By Microbially Induced Calcite Precipitation, Wei-Min Xiao, Xin Lin, Jian-Min Zhong, Shuang Li, Zhan-Yuan Zhu
Experimental Study On Rock Joint Permeability Evolution During Plugging Process By Microbially Induced Calcite Precipitation, Wei-Min Xiao, Xin Lin, Jian-Min Zhong, Shuang Li, Zhan-Yuan Zhu
Rock and Soil Mechanics
Microbially induced calcite precipitation (MICP) has been widely applied for soil reinforcement, but its applications in rock mass permeability reduction have been rarely reported. To explore the plugging mechanism of rock joints using MICP, artificial rock joint specimens made of transparent resin were prepared, and laboratory MICP plugging experiments under six various conditions considering MICP reaction influence factors were performed. Through the plugging experiments, evolution laws of rock joint transmissivity and hydraulic aperture, accompanied with corresponding CaCO3 distribution images, during plugging processes were obtained. The experimental results showed that the hydraulic aperture of rock joint approximately decreases linearly with grouting …
Inverse Analysis On Dynamic Shear Modulus Of Earth-Rockfill Dam Foundation Based On The Influence Of Dynamic Earth Pressure, Xiao-Shi Huang, Jun-Qing Huang, Ye-Gan Yan, Yu-Bing Wang
Inverse Analysis On Dynamic Shear Modulus Of Earth-Rockfill Dam Foundation Based On The Influence Of Dynamic Earth Pressure, Xiao-Shi Huang, Jun-Qing Huang, Ye-Gan Yan, Yu-Bing Wang
Rock and Soil Mechanics
The one-dimensional shear beam model method is unsuitable for determining the stress–strain relationship in the earth-rockfill dam foundation because of the constrained ground surface and the effects of the lateral normal stress. A centrifugal shaking table test was conducted on an earth-rockfill dam with overburden saturated sand foundation to analyze the soil acceleration response in the non- dam-covered area of the foundation, middle and toe of the dam under different input seismic loads. This test also obtained the variation characteristics of the horizontal dynamic earth pressure in the upper and middle layers of the dam foundation. An inverse calculation method …
Service-Learning In Action: Lafayette, Indiana, Rain Garden Installation, Elizabeth Mccleery
Service-Learning In Action: Lafayette, Indiana, Rain Garden Installation, Elizabeth Mccleery
Purdue Journal of Service-Learning and International Engagement
Indiana’s Wabash River is being polluted with contaminated water runoff from precipitation events. A lack of pervious land cover has led to an accumulation of fertilizer, sediment, and waste in the river. Green infrastructure, a stormwater management practice that mimics the natural ecosystem, is one of the most effective ways to prevent pollution from stormwater runoff and benefit the community. This project consisted of a rain garden installation at the Lafayette Fueling Station, a site where frequent water drainage and water runoff into the Wabash occurs. The rain garden will allow on-site water infiltration during rain events and promote natural …
Experimental Study On Shear Properties Of Fault Gouge With Different Mineral Compositions, Li-Huan Xie, He-Juan Liu, Sheng-Nan Ban, Hai-Jun Mao, De-Bin Xia, Yu-Jia Song, Rong-Chen Tong, Qi-Qi Ying
Experimental Study On Shear Properties Of Fault Gouge With Different Mineral Compositions, Li-Huan Xie, He-Juan Liu, Sheng-Nan Ban, Hai-Jun Mao, De-Bin Xia, Yu-Jia Song, Rong-Chen Tong, Qi-Qi Ying
Rock and Soil Mechanics
The strength parameters of fault gouge is significant for the fault sealing of underground gas storage. In this paper, direct shear tests are performed for fault gouge composed of different contents of kaolinite(K), montmorillonite(M) and quartz(Q), thus obtaining the shear strength parameters (cohesion c and internal friction angle ) of various types of fault gouge. The results reveal that: (1) the cohesion of fault gouge is positively correlated with the content of montmorillonite and negatively correlated with the content of quartz. The cohesion of fault gouge specimens with high content of montmorillonite (≥40%) is positively correlated with the content of …
Experimental Study Of Capillary Water Rising In Aeolian Sand Using A Moisture Field Testing Technique Based On Image Rgb Information, Sheng-Kui Tian, Guan-Shi Liu, Qing-Song Zhao, Guo-Fang Xu, Ming-Xuan Cai
Experimental Study Of Capillary Water Rising In Aeolian Sand Using A Moisture Field Testing Technique Based On Image Rgb Information, Sheng-Kui Tian, Guan-Shi Liu, Qing-Song Zhao, Guo-Fang Xu, Ming-Xuan Cai
Rock and Soil Mechanics
Capillary action has an important impact on the deformation and stability of various geotechnical engineering structures. It is challenging to accurately monitor the dynamic changes in the capillary water rising process by traditional methods. In this study, the relationship between RGB (red, green, blue) information and water content of aeolian sand images was firstly investigated. The methodology and technology for measuring water content and obtaining centimeter-level resolution moisture fields via image RGB information were developed. According to this method, the spatial-temporal variation of water content during capillary water rising in aeolian sand was further explored, and the wetting front profile …
Experimental Investigation On Quantitative Evaluation Of Rock Hardness Based On Impact Energy Dissipation Index, Rui-Lang Cao, Yu-Jie Wang, Bo Xing, Yu-Fei Zhao, Qiang Shen
Experimental Investigation On Quantitative Evaluation Of Rock Hardness Based On Impact Energy Dissipation Index, Rui-Lang Cao, Yu-Jie Wang, Bo Xing, Yu-Fei Zhao, Qiang Shen
Rock and Soil Mechanics
Rock hardness is an important indicator reflecting the relative hardness, drillability, and blastability of rock formation. Accurate interpretation of the response of percussion drilling tools can provide new possibilities for in-situ, rapid, and quantitative evaluation of rock hardness. High-precision digital displacement, hydraulic pressure, and rotational speed sensors were used to monitor the key transmission parts of the percussion drill, and a digital monitoring system for the drilling process was then established. Rock hardness measurement and orthogonal tests of percussion drilling were parallelly carried out, and a standard database containing response data of the drill when drilling various types of rocks …
Multi-Directional Cyclic Simple Shear Behaviour Of Loose Sand Under Complex Initial Stress States, Yao Li, Jia-Ping Li
Multi-Directional Cyclic Simple Shear Behaviour Of Loose Sand Under Complex Initial Stress States, Yao Li, Jia-Ping Li
Rock and Soil Mechanics
Loose sand is highly susceptible to liquefaction, and small changes in stress state can affect its liquefaction characteristics. Based on multi-directional cyclic simple shear tests, this study conducted cyclic simple shear tests on loose sand under different magnitudes and directions of static shear stress, and complex shear paths. The cyclic simple shear characteristics of loose sand under complex initial stress states are studied. The main conclusions are drawn as follows: (1) As the static shear stress ratio increases, the peak shear stress of the specimen increases, the increment of pore water pressure in the first cycle increases, and the specimen …
Characteristics And Mechanism Of Soil Heave At The Bottom Of Ultra-Deep Circular Shafts In Soft Soil Areas, Ya-Fei Qiao, Kai Yan, Teng-Teng Zhao, Wen-Qi Ding
Characteristics And Mechanism Of Soil Heave At The Bottom Of Ultra-Deep Circular Shafts In Soft Soil Areas, Ya-Fei Qiao, Kai Yan, Teng-Teng Zhao, Wen-Qi Ding
Rock and Soil Mechanics
Based on an ultra-deep circular shaft project in Shanghai, the field data of soil heave at the bottom of the pit during the construction were collected, and the vertical distribution pattern, evolution law and main influencing factors of soil heave at the bottom of the pit were summarized. An axisymmetric numerical model was then built and verified to investigate the effect of the excavation-induced unloading, dewatering, diaphragm wall and soil mechanical properties on the soil heave, then the mechanism of soil heave was revealed. Soil heave was the combined result of the soil mechanical response under the excavation-induced unloading, dewatering, …
Numerical Simulation Of Three-Dimensional Rock Fragmentation By Disc Cutters Of Tunnel Boring Machine Using Peridynamics, Jian Zhou, Xiao-Nan Shang, Fu-Shen Liu, Jun-Yi Shen, Xing-Chuan Liao
Numerical Simulation Of Three-Dimensional Rock Fragmentation By Disc Cutters Of Tunnel Boring Machine Using Peridynamics, Jian Zhou, Xiao-Nan Shang, Fu-Shen Liu, Jun-Yi Shen, Xing-Chuan Liao
Rock and Soil Mechanics
Peridynamics is a non-local mesh-free numerical method which has great advantages in simulating dynamic damage and fracture. This work proposes to use the peridynamics to simulate rock fragmentation by TBM disc cutters and seven tests are simulated to verify this idea. The feasibility of peridynamics in simulating rock fragmentation by TBM disc cutters is demonstrated by comparisons with the punch indentation tests. A nonlinear short-range force contact model is proposed to better reflect the variation of the disc cutter normal force with respect to indentation depth, and can also calculate the changing contact area between the disc cutter and the …
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 …
Early-Age Strength And Failure Characteristics Of 3d Printable Polymer Concrete: Numerical Modelling And Experimental Testing, Mohammad Amin Dehghani Najvani
Early-Age Strength And Failure Characteristics Of 3d Printable Polymer Concrete: Numerical Modelling And Experimental Testing, Mohammad Amin Dehghani Najvani
Civil Engineering ETDs
The time-dependent rheological and early-age strength parameters of Polymer concrete (PC) were investigated. PC flow decreased, and the static yield stress and thixotropy increased as the specimen aged, while the dynamic yield stress remained unchanged. The study found that the Herschel-Bulkley model can accurately describe the PC’s rheological behavior over time. The change in cohesion strength and internal friction angle over time was observed using uniaxial unconfined compression and direct shear tests of fresh PC. A time-dependent MohrCoulomb failure criterion was established. Temperature analysis was used to determine the gel time and explain the evolution of the time-dependent early-age strength …
Modeling Of Asphalt Concrete For Cross-Anisotropic Visco-Elasticity And Heterogeneity, Zafrul Hakim Khan
Modeling Of Asphalt Concrete For Cross-Anisotropic Visco-Elasticity And Heterogeneity, Zafrul Hakim Khan
Civil Engineering ETDs
Asphalt Concrete (AC) is a cross-anisotropic viscoelastic material. This study has developed a methodology to backcalculate the cross-anisotropic properties of the AC layer from the Falling Weight Deflectometer (FWD) sensor and pavement response data from embedded sensors inside a pavement section. This study has also developed a two-way coupled Multiscale Finite Element Model (MsFEM) with Phase Field Fracture (PFF) to study the microstructural heterogeneity and damage of the AC layer based on the actual field loadings. A Finite Difference Time Domain (FDTD) and Machine learning-based backcalculation algorithm were developed to determine the layer thickness and dielectric constant from air-coupled Ground …
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. …
Enhancing Wettability Prediction In The Presence Of Organics For Hydrogen Geo-Storage Through Data-Driven Machine Learning Modeling Of Rock/H2/Brine Systems, Zeeshan Tariq, Muhammad Ali, Nurudeen Yekeen, Auby Baban, Bicheng Yan, Shuyu Sun, Hussein Hoteit
Enhancing Wettability Prediction In The Presence Of Organics For Hydrogen Geo-Storage Through Data-Driven Machine Learning Modeling Of Rock/H2/Brine Systems, Zeeshan Tariq, Muhammad Ali, Nurudeen Yekeen, Auby Baban, Bicheng Yan, Shuyu Sun, Hussein Hoteit
Research outputs 2022 to 2026
The success of geological H2 storage relies significantly on rock–H2–brine interactions and wettability. Experimentally assessing the H2 wettability of storage/caprocks as a function of thermos-physical conditions is arduous because of high H2 reactivity and embrittlement damages. Data-driven machine learning (ML) modeling predictions of rock–H2–brine wettability are less strenuous and more precise. They can be conducted at geo-storage conditions that are impossible or hazardous to attain in the laboratory. Thus, ML models were utilized in this research to accurately model the wettability behavior of a ternary system consisting of H2, rock minerals (quartz and mica), and brine at different operating geological …
Study Of Multi-Dimensional Transfer Effects In Applied Smouldering Systems, Seyed Ziaedin Miry Mr
Study Of Multi-Dimensional Transfer Effects In Applied Smouldering Systems, Seyed Ziaedin Miry Mr
Electronic Thesis and Dissertation Repository
Smouldering is a flameless form of combustion that is driven by oxygen directly diffusing into the surface of condensed phase fuel (liquid or solid) and involves a complex interplay between heat and mass transfer through porous media, chemical reactions, and multiphase flow. Applied smouldering systems have been gaining popularity for a variety of applications including (i) energy and resource recovery, (ii) waste-to-energy, (iii) pyrolysis and gasification, and (iv) applied smouldering of organic liquids/solids for environmental benefits. In all contexts, smouldering is a complicated oxygen-limited phenomenon where multi-dimensional transfer effects (i.e., non-uniformities in …
The Utilization Of Repurposed Whole Textiles To Modify The Mechanical And Hydrogeological Soil Properties: Green Media, Angelis Almanzar-Chevalie, Yehya Elfgeeh, Calvin O. Walters Jr.
The Utilization Of Repurposed Whole Textiles To Modify The Mechanical And Hydrogeological Soil Properties: Green Media, Angelis Almanzar-Chevalie, Yehya Elfgeeh, Calvin O. Walters Jr.
Publications and Research
The utilization of repurposed whole textiles to modify the mechanical and hydrogeological soil properties investigates the impact of adding repurposed textiles to lightweight engineered soil, documenting changes in unit weight, water content, and hydraulic conductivity. This study builds upon prior findings, which demonstrated significant alterations in hydrogeological properties when incorporating textile fabric (3% by weight at an aspect ratio of 1:1). Functioning as reinforcement, these fibers enhance the soil's strength, stability, and structural integrity—especially advantageous in erosion-prone areas, regions susceptible to landslides, or locations requiring heightened load-bearing capacity. The outcomes of this parametric study lead to green roof farms playing …
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 …