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Articles 1 - 30 of 453
Full-Text Articles in Geotechnical Engineering
Experimental Study On Shear Strength Of Unsaturated Soil Over A Wide Suction Range And Its Prediction, Geng Niu, Xiao-Feng Zhu, Jun-Xing Li, Meng-Yuan Lü, Li-Qi An, Zi-Han Chen
Experimental Study On Shear Strength Of Unsaturated Soil Over A Wide Suction Range And Its Prediction, Geng Niu, Xiao-Feng Zhu, Jun-Xing Li, Meng-Yuan Lü, Li-Qi An, Zi-Han Chen
Rock and Soil Mechanics
In this paper, the experimental studies on the water retention and strength properties of unsaturated weakly expansive soil in a wide suction range were carried out, and a strength model of unsaturated soil over a wide suction range was proposed. The results show that in the wide suction range, the stress‒strain curve increases with the increase of suction. The strain hardening occurs in the low suction range, while the strain softening appears in the high suction range. In the low suction range, the sample presents shear contraction, while in the high suction range, the sample begins to show a shear …
Energy Evolution Of Unloading Confining Pressure And Dissipative Energy Damage Constitutive Model Of Coal-Rock Combination, Wen-Kai Ru, Shan-Chao Hu, Di-Yuan Li, Jin-Yin Ma, Chen-Xi Zhang, Ping-Kuang Luo, Hao Gong, Ao-Hui Zhou
Energy Evolution Of Unloading Confining Pressure And Dissipative Energy Damage Constitutive Model Of Coal-Rock Combination, Wen-Kai Ru, Shan-Chao Hu, Di-Yuan Li, Jin-Yin Ma, Chen-Xi Zhang, Ping-Kuang Luo, Hao Gong, Ao-Hui Zhou
Rock and Soil Mechanics
In coal mining, the excavation of a coal-rock roadway and a thin coal seam will inevitably cause radial unloading of the coal-rock combination system. The radial unloading phenomenon is often accompanied by the rapid accumulation and release of energy, so it is necessary to investigate the energy evolution law of coal-rock combination specimens under the unloading confining pressure condition. To this end, the unloading confining pressure tests with different unloading rates were carried out for the coal-rock combination specimens. The results show that: (1) The axial loading and constant stress stages are the main energy storage stages of the combination …
Reliability Of Offshore Plate Anchor Design In Sand For Uplift Limit State, Yu-Ting Li, Xiao-Bin Chen, Peng-Peng He
Reliability Of Offshore Plate Anchor Design In Sand For Uplift Limit State, Yu-Ting Li, Xiao-Bin Chen, Peng-Peng He
Rock and Soil Mechanics
The offshore wind industry needs to move towards floating offshore wind turbines (FOWTs) that are secured to the seabed with anchoring systems in order to harness the more substantial amounts of offshore wind resources available in deep waters. The design of the anchoring system for FOWTs is crucial to ensure stability and safety in challenging offshore conditions. As a simplified reliability- based design approach, the partial safety factor method remains important in current offshore foundation design practice, but its effectiveness in achieving the required target safety level still needs to be examined. To achieve this end, a reliability analysis is …
Analysis Of Factors Affecting Permeability Of Calcareous Sand In Salt Solution Environment, Si-Wei Zheng, Ming-Jian Hu, Yu-Long Huo, Yu Li
Analysis Of Factors Affecting Permeability Of Calcareous Sand In Salt Solution Environment, Si-Wei Zheng, Ming-Jian Hu, Yu-Long Huo, Yu Li
Rock and Soil Mechanics
Permeability is the capacity of a soil for transmitting a fluid, e.g., a salt solution, through soil pores. The permeability coefficient K is an important measurement of the soil permeability, which is affected by various factors. The existing research on the permeability of sandy soil is basically carried out in the freshwater environment. However, the calcareous sand is a typical marine sedimentary sand, which is deposited in the seawater environment with certain salt concentrations. In order to investigate the influence of void ratio, particle size and concentration of the salt solution on the permeability of calcareous sand in a salt …
Strength Model Of Anisotropic Rocks Based On Hoek-Brown Criterion, Guo-Xiao Li, Hang-Long Wang, Jun Peng, Lin-Fei Wang, Bi-Bo Dai
Strength Model Of Anisotropic Rocks Based On Hoek-Brown Criterion, Guo-Xiao Li, Hang-Long Wang, Jun Peng, Lin-Fei Wang, Bi-Bo Dai
Rock and Soil Mechanics
In order to improve the applicability of Hoek-Brown failure criterion and reduce subjectivity in the determination of geological strength index (GSI) value for anisotropic rocks, a modified Hoek-Brown failure criterion is proposed, which considers the variation of the GSI value with the bedding angle of anisotropic rocks. Triaxial compression test data of anisotropic rocks with different bedding angles were first collected. The results show that the peak strength of anisotropic rocks exhibits a U-shaped relation with bedding angle . Then, the rock specimen with the bedding angle = 0º is defined as the intact rock. The uniaxial compressive strength …
Correlation Between Macro And Micro Mechanical Parameters Of Marble Based On Nanoindentation Experiment, Xian-Hui Chen, Yi Cheng, Xin-Yue Xie, Mi-Mi Chen
Correlation Between Macro And Micro Mechanical Parameters Of Marble Based On Nanoindentation Experiment, Xian-Hui Chen, Yi Cheng, Xin-Yue Xie, Mi-Mi Chen
Rock and Soil Mechanics
Nanoindentation experiment is an important means to study micro mechanical properties of rock. Up to now only a few studies have discussed the correlation between the micro mechanical properties of rock and various macroscopic strengths of the rock. Firstly, the nanoindentation experiments on four different kinds of marble were carried out by the continuous stiffness measurement technique to obtain the micro mechanical parameters of dolomite and calcite. Secondly, the microscopic data scale was upgraded by Mori-Tanaka method to obtain the homogenized elastic modulus and Poisson’s ratio. Finally, the correlation between the microscopic parameters and the macroscopic mechanical experiment results was …
Fatigue Analysis Of Jacket Foundations For Offshore Wind Turbines, Yue-Ming Du, De-Qiong Kong, Si-Liu Wang, Bin Zhu
Fatigue Analysis Of Jacket Foundations For Offshore Wind Turbines, Yue-Ming Du, De-Qiong Kong, Si-Liu Wang, Bin Zhu
Rock and Soil Mechanics
Jacket foundations are considered as the most promising solution for offshore wind turbines (OWTs), due to its large lateral stiffness and adaptability to different marine environments. Nowadays, the study on jacket foundations mainly focuses on the bearing and deformation behavior, with significantly less attention being paid to their fatigue damage. Besides, the actual pile-soil interaction is always ignored when assessing the fatigue damage or fatigue life of the foundations for OWTs. This paper presents the development of a three-dimensional numerical model of tetrapod piled jacket foundations, with the interaction between the corner piles and the soil being implemented into it. …
Meso-Fracture Evolution Characteristics Of Freeze-Thawed Sandstone Based On Discrete Element Method Simulation, Yong-Jun Song, Yin-Wei Sun, Chen-Jing Li, Hui-Min Yang, Lei-Tao Zhang, Li-Jun Xie
Meso-Fracture Evolution Characteristics Of Freeze-Thawed Sandstone Based On Discrete Element Method Simulation, Yong-Jun Song, Yin-Wei Sun, Chen-Jing Li, Hui-Min Yang, Lei-Tao Zhang, Li-Jun Xie
Rock and Soil Mechanics
To investigate the mesoscopic damage accumulation and the loading-induced fracture process in freeze-thawed rocks, a method coupling water-ice particle phase transition and expansion based on the discrete element method is proposed. The rock freeze-thaw process is simulated using a particle flow program, and the reliability of the simulation results is verified through laboratory experiments. The frost heave evaluation index of pore water particles is quantitatively characterized, and a functional relationship between and the number of freeze-thaw cycles N is established. Furthermore, the fracture characteristics and the evolution of microcrack, displacement field and force chain field in freeze-thawed rocks during the …
Study On The Identification Method Of Tunnel Surrounding Rock Failure Zone Based On Continuous Discontinuous Analysis Theory, Ming-Qing Xiao, Chen Xu, Jian Yang, Jia-Ming Wu, Xiao-Dong Fu, Yong-Qiang Zhou
Study On The Identification Method Of Tunnel Surrounding Rock Failure Zone Based On Continuous Discontinuous Analysis Theory, Ming-Qing Xiao, Chen Xu, Jian Yang, Jia-Ming Wu, Xiao-Dong Fu, Yong-Qiang Zhou
Rock and Soil Mechanics
Accurate analyzing the scope of tunnel excavation failure zone has important guidance and engineering significance in determining support parameters reasonably. This study focuses on the identification methods of tunnel surrounding rock failure zone, specifically the continuous medium analysis method and the continuous-discontinuous method represented by the finite element-discrete element coupling method (FDEM). Firstly, the continuous medium analysis method and FDEM identification criteria for surrounding rock failure are studied. Then the rock mass is divided into elastic rock elements and elastic-plastic interface elements. Based on the concept of equivalent continuous model, the relationship between the mechanical parameters of interface elements and …
Law Of Disturbed Stress Rotation Induced By Hard Rock Excavation And Its Influence On Rock Fracture, Qian-Cheng Sun, Yue Liu, Qing-Wen Wang, Shao-Jun Li, Min-Zong Zheng
Law Of Disturbed Stress Rotation Induced By Hard Rock Excavation And Its Influence On Rock Fracture, Qian-Cheng Sun, Yue Liu, Qing-Wen Wang, Shao-Jun Li, Min-Zong Zheng
Rock and Soil Mechanics
The rock fracture caused by disturbed stress field change in deep underground engineering is a common issue receiving continuous attention. After analyzing the test data of disturbed stress field in Jinping underground laboratory phase II project, the variation law of disturbed stress field under different construction processes was interpreted, and the change mode of principal stress direction was analyzed. Through the comparative analysis about in-situ drilling imaging of rock mass, the influence of principal stress direction change on surrounding rock fracture was revealed. The results show that the disturbed stress field changes the most actively at the stage of middle …
Thermo-Hydro-Mechanical Coupling Model For Natural Gas Hydrate-Bearing Sediments With Depressurization Based On Opengeosys, Zhi-Gang Ye, Lu-Jun Wang, Bin Zhu, Yun-Min Chen
Thermo-Hydro-Mechanical Coupling Model For Natural Gas Hydrate-Bearing Sediments With Depressurization Based On Opengeosys, Zhi-Gang Ye, Lu-Jun Wang, Bin Zhu, Yun-Min Chen
Rock and Soil Mechanics
Natural gas hydrates are considered as one of the most important potential alternatives for energy shortage, and depressurization is believed to be the most economic effectiveness for hydrate exploitation. The exploitation induces solid hydrate dissociation, liquid / gas generation and migration, heat transfer and skeleton deformation, showing strong thermo-hydro-mechanical (THM) coupling behavior of sediments. These processes will trigger geotechnical hazards, such as borehole inclination and reservoir collapse. A THM coupling numerical model for hydrate exploitation was developed based on the open-source FEM platform OpenGeoSys. In detail, the kinetic reaction equation was implemented to represent the liquid/gas generation during gas hydrate …
Analytical Solution Of Deformation Of Underlying Shield Tunnel Caused By Foundation Pit Excavation And Dewatering, Ling-Xiao Guan, Chang-Jie Xu, Xue-Peng Wang, Xue-Qin Xia, Wen-Hai Ke
Analytical Solution Of Deformation Of Underlying Shield Tunnel Caused By Foundation Pit Excavation And Dewatering, Ling-Xiao Guan, Chang-Jie Xu, Xue-Peng Wang, Xue-Qin Xia, Wen-Hai Ke
Rock and Soil Mechanics
The foundation pit excavation and dewatering break the equilibrium stress field of the surrounding soil layer and negatively affect the underlying shield tunnel. The analytical solution of the longitudinal deformation of the underlying tunnel caused by foundation pit excavation and dewatering is proposed using a two-stage analysis method. In the first stage, Mindlin elastic solution and effective stress principle are used to calculate the additional stress caused by excavation and dewatering. In the second stage, the shield tunnel is treated as a Timoshenko beam resting on the Pasternak foundation to simulate the interaction between the tunnel and soil. The analytical …
Bearing Capacity Of Shallow Foundations Considering Geological Uncertainty And Soil Spatial Variability, Qi-Hao Jiang, Jin-Tong Wang, Bo Hou, Dong-Ming Zhang, Jin-Zhang Zhang
Bearing Capacity Of Shallow Foundations Considering Geological Uncertainty And Soil Spatial Variability, Qi-Hao Jiang, Jin-Tong Wang, Bo Hou, Dong-Ming Zhang, Jin-Zhang Zhang
Rock and Soil Mechanics
The bearing capacity of shallow foundations is significantly affected by stratum uncertainty, mainly including geological uncertainty and spatial variability of soil properties. The influence of geological uncertainty and soil spatial variability on the bearing capacity of shallow foundations has been separately investigated in previous studies. This study aims to develop a general probabilistic computational framework to reveal the effects of geological uncertainty and spatial variability of soil properties on the bearing capacity of shallow foundations, in which the geological uncertainty is simulated by Markov random field and the soil spatial variability is characterized using log-normal random field in different strata …
Analysis Of Shear Characteristics Of Soil-Rock Mixture–Geotextile Interface Under Normal Cyclic Loading, Shui-Jiang Li, Jia-Min Yao, Fei-Yu Liu, Hong-Bo Liu, Juan Hou
Analysis Of Shear Characteristics Of Soil-Rock Mixture–Geotextile Interface Under Normal Cyclic Loading, Shui-Jiang Li, Jia-Min Yao, Fei-Yu Liu, Hong-Bo Liu, Juan Hou
Rock and Soil Mechanics
The dynamic shear characteristics of the reinforcement–soil interface affect the stability and durability of reinforced soil–rock mixture subgrades. A series of static and dynamic direct shear tests was conducted on the soil–rock mixture–geotextile interface using a large dynamic direct shear apparatus under different rock contents (0%, 25%, 50%, 75% and 100%). The effects of normal stress amplitude (10, 20, 30, 40 and 60 kPa) and normal loading frequency (0.5, 1.0 and 2.0 Hz) on the shear response of the interface were analyzed. The test results indicate that the shear strength of the upper and lower boundaries of the interface first …
Field Study On The Ultimate Bearing Capacity Of Enlarged Grout Base Of Pre-Bored Grouted Planted Pile, Wei-Dong Wang, Meng Wang, Jiang-Bin Wu
Field Study On The Ultimate Bearing Capacity Of Enlarged Grout Base Of Pre-Bored Grouted Planted Pile, Wei-Dong Wang, Meng Wang, Jiang-Bin Wu
Rock and Soil Mechanics
Pre-bored grouted planted pile is a new type of eco-friendly pile foundation. The combination of the lower section of PHC nodular pile and the pile base expansion greatly improves the vertical bearing capacity of single pile. A lot of application practices have been achieved in Jiangsu, Zhejiang and Shanghai regions, but limited to the current research status, the bearing capacity of enlarged grout base is not clear. Based on the in-situ self-balanced loading test, the ultimate compressive bearing capacity of the enlarged grout base of the pre-bored grouted planted pile is investigated. The research results reveal that the measured ultimate …
Meso-Structure Damage Evolution In Shear Bands Of Granite Residual Soil, Cheng-Sheng Li, Ling-Wei Kong, Rong-Jun Shu, Zhi-Jun Liu, Bing-Xin Zhang
Meso-Structure Damage Evolution In Shear Bands Of Granite Residual Soil, Cheng-Sheng Li, Ling-Wei Kong, Rong-Jun Shu, Zhi-Jun Liu, Bing-Xin Zhang
Rock and Soil Mechanics
Shear band and crack evolution are very important for landslides. Crack is the weakest area in soil, and there is a lack of effective methods to analyze the meso-structure damage in shear bands quantitatively. To reveal the influence of cracks in granite residual soil on shear deformation and failure, CT scanning was used to obtain volume images of the sample at different loading stages during triaxial loading. Based on the digital volume correlation (DVC) method, a crack classification method is established according to the connectivity characteristics of cracks before and after loading. The cracks can be divided into eight kinds: …
Performance Of Finned Pile Under Torsional Load In Sand, Aalaa Khater, Ahmad Nasr Prof, Waseim Azzam Prof
Performance Of Finned Pile Under Torsional Load In Sand, Aalaa Khater, Ahmad Nasr Prof, Waseim Azzam Prof
Journal of Engineering Research
The pile foundations can experience torsional loads from earthquakes, wind, waves, offshore wind turbines, electrical transmission towers, and ship collisions in the maritime environment. Additionally, the axial load from the supporting superstructures can also cause torsional loads. This paper presents a new approach to pile modification called the finned pile. To enhance the torsional capacity of a single pile in the sand (where sand was used in a state of medium density Dr=50%), with or without fins, a number of experimental tests were conducted to investigate the effects of torsional loads (T), these studies involved varying the length, width, shape, …
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 …