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Articles 91 - 120 of 5035
Full-Text Articles in Engineering
Enhancing The Co2 Trapping Capacity Of Saudi Arabian Basalt Via Nanofluid Treatment: Implications For Co2 Geo-Storage, Muhammad Ali, Nurudeen Yekeen, Mirhasan Hosseini, Ghazanfer R. Abbasi, Amer Alanazi, Alireza Keshavarz, Thomas Finkbeiner, Hussein Hoteit
Enhancing The Co2 Trapping Capacity Of Saudi Arabian Basalt Via Nanofluid Treatment: Implications For Co2 Geo-Storage, Muhammad Ali, Nurudeen Yekeen, Mirhasan Hosseini, Ghazanfer R. Abbasi, Amer Alanazi, Alireza Keshavarz, Thomas Finkbeiner, Hussein Hoteit
Research outputs 2022 to 2026
Mineralization reactions in basaltic formations have gained recent interest as an effective method for CO2 geo-storage in order to mitigate anthropogenic greenhouse gas emissions. The CO2/rock interactions, including interfacial tension and wettability, are crucial factors in determining the CO2 trapping capacity and the feasibility of CO2 geological storage in these formations. The Red Sea geological coast in Saudi Arabia has many basaltic formations, and their wetting characteristics are rarely reported in the literature. Moreover, organic acid contamination is inherent in geo-storage formations and significantly impacts their CO2 geo-storage capacities. Hence, to reverse the organic effect, the influence of various SiO2 …
Permeability Prediction For Expansive Soil Based On Physical Properties Using Artificial Neural Networks, Ferry Fatnanta, Imam Suprayogi, Nicola Rabb Ranata, Soewignjo Agus Nugroho, Agus Ika Putra
Permeability Prediction For Expansive Soil Based On Physical Properties Using Artificial Neural Networks, Ferry Fatnanta, Imam Suprayogi, Nicola Rabb Ranata, Soewignjo Agus Nugroho, Agus Ika Putra
Makara Journal of Technology
Permeability is a soil parameter related to the construction industry to understand the processes of infiltration, runoff, and settlement. The risk of testing errors is inevitable in permeability investigations, especially in expansive soils. Trial and error in permeability testing becomes difficult due to soils with small pore sizes and large shrinkage expansion. Several studies related to soil physical properties that affect permeability have been conducted. However, the correlation results obtained still have poor accuracy. Artificial neural networks (ANN) are machine learning systems that can change their structure to solve problems that are included in the system. The use of ANNs …
Improving Square Skirted Foundations Behavior On Sand, Tamer Al-Shyoukhi, Ayman Altahrany, Mahmoud Elmeligy
Improving Square Skirted Foundations Behavior On Sand, Tamer Al-Shyoukhi, Ayman Altahrany, Mahmoud Elmeligy
Mansoura Engineering Journal
Shallow foundations' behavior is enhanced by using skirts to confine the soil beneath the foundation. The bearing capacity and settlement of skirted foundations resting on the sand are influenced by the size of the skirt cell and shear strength of sand. Experimental modelling was carried out on an axially square-skirted footing resting on sand in this study. Plaxis-3D software was used for numerical analysis to support the experimental results. The numerical analysis results validated the experimental results. The outcomes of the study demonstrated that skirts wider than the footing size increased the bearing capacity of skirted foundations. In the case …
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 …
Dynamic Response And Characteristics Of Tapered Rigid Core Composite Cement- Soil Piles Under Cyclic Loading, Jie He, Duan-Wei Guo, De-Xin Song, Meng-Xin Liu, Lei Zhang, Qi-Feng Wen
Dynamic Response And Characteristics Of Tapered Rigid Core Composite Cement- Soil Piles Under Cyclic Loading, Jie He, Duan-Wei Guo, De-Xin Song, Meng-Xin Liu, Lei Zhang, Qi-Feng Wen
Rock and Soil Mechanics
Tapered rigid core composite cement-soil pile is an emerging type of composite pile. In order to investigate its bearing behavior in engineering applications such as highways and railways under long-term cyclic loading, model tests were conducted on four composite piles with different pile core wedge angles, static loading ratios and cyclic loading ratios. The ultimate bearing capacity under static loading as well as the cumulative settlement, pile axial force distribution, tip resistance and side friction resistance were evaluated. The results indicated that the bearing capacity of tapered inner core composite piles under static loading was better than that of constant …
Infiltration Characteristics And Deformation Mechanism Of Rainfall-Induced Landslides In Three Gorges Reservoir Area Based On 1d And 2d Model Tests, Li Wang, Fang-Yun Nan, Shi-Mei Wangi, Yong Chen, Xiao-Wei Li, Zhi-Hong Fan, Yu-Shan Chen
Infiltration Characteristics And Deformation Mechanism Of Rainfall-Induced Landslides In Three Gorges Reservoir Area Based On 1d And 2d Model Tests, Li Wang, Fang-Yun Nan, Shi-Mei Wangi, Yong Chen, Xiao-Wei Li, Zhi-Hong Fan, Yu-Shan Chen
Rock and Soil Mechanics
Shallow deformation of ancient landslides induced by heavy rainfall is the most serious geological disaster in China's Three Gorges Reservoir Area (TGRA). It is important to explore the infiltration characteristics and its shallow deformation mechanism caused by heavy rainfall. In this study, the rainfall-induced landslide of the TGRA was selected as the research object, and the distributions of the soil permeability coefficients for rainfall-type landslide were summarized. Considering the effects of heavy rainfall, one-dimensional (1D) soil column infiltration test and two-dimensional (2D) landslide model test were conducted to study the infiltration characteristics of landslide soil and the corresponding shallow deformation …
Mechanical Properties Of Fractured Sandstone After Cyclic Thermal Shock, Man Li, Xian-Shan Liu, Yu-Hua Pan, Shi-Hao Qiao, Zi-Yu Hao, Lei Qian, Xiao-Lei Luo
Mechanical Properties Of Fractured Sandstone After Cyclic Thermal Shock, Man Li, Xian-Shan Liu, Yu-Hua Pan, Shi-Hao Qiao, Zi-Yu Hao, Lei Qian, Xiao-Lei Luo
Rock and Soil Mechanics
The stimulation of thermal reservoirs in sandstone and its long-term stability evaluation are of great significance to the development of geothermal energy. In this paper, the mechanical properties of fractured sandstone under 0–8 cycles of thermal shocks are studied. The experimental results show that the P-wave velocity, uniaxial compressive strength (UCS) and elastic modulus of fractured sandstone all decrease gradually with the increase in the number of thermal shocks under two types of cooling methods. Compared with the cooling method in the water, the natural cooling method in the air causes less damage to the mechanical properties of fractured sandstone. …
Evolution Mechanism Of Deformation And Failure Of Rock Slope With Controlling Fissure Through Transparent Physical Model Experiments, Xian-Lun Leng, Chuan Wang, Qian Sheng, Wen-Jun Song, Jian Chen, Zhan-Rong Zhang, Fei Chen
Evolution Mechanism Of Deformation And Failure Of Rock Slope With Controlling Fissure Through Transparent Physical Model Experiments, Xian-Lun Leng, Chuan Wang, Qian Sheng, Wen-Jun Song, Jian Chen, Zhan-Rong Zhang, Fei Chen
Rock and Soil Mechanics
The deformation and failure evolution process of rock slope during disaster incubation period is controlled by internal long fissures (controlling fissures), and the evolution mechanism is of great significance for the prevention of landslide disasters. Based on the transparent physical model experiment technology, two typical rock slopes with controlling fissures (one with a steep fissure in the upper part of slope and the other with a gently inclined fissure in the lower part) were selected as the objects, and the evolution process of deformation and failure inside the slopes was studied through physical model experiments using the self-developed equipment. The …
Understanding The Hydromechanical Effects Of Extreme Events To Improve The Performance Of Infrastructure Foundations, Siddharth Marathe
Understanding The Hydromechanical Effects Of Extreme Events To Improve The Performance Of Infrastructure Foundations, Siddharth Marathe
All Dissertations
Extreme hydroclimatic events like heavy rainfall, flooding, and prolonged drought can potentially cause the failure of infrastructure foundations, leading to socio-economic losses. The objective of this dissertation is to understand the deformation and bearing capacity behavior of drilled shafts subjected to extreme hydroclimatic events, including heavy rainfall, prolonged drought, and earthquake. The Finite Element Method (FEM) results show that during rainfall, the drilled shaft settled caused by a decrease in the porewater pressure in the sand leading to a decrease in the axial bearing capacity. The axial force variation from an experimental investigation showed good agreement with the FEM. The …
Evaluating The Feasibility Of Using Strain Measured During Sinusoidal Rate Pumping Tests To Characterize An Aquifer, Riley Blais
Evaluating The Feasibility Of Using Strain Measured During Sinusoidal Rate Pumping Tests To Characterize An Aquifer, Riley Blais
All Theses
Pumping tests with sinusoidal variation in pumping rate have been proposed as a method for improving aquifer characterization. These tests can interrogate a larger aquifer volume than slug tests and they can be more sensitive to small variations in drawdown. Current methods of using sinusoidal variations of rate are based on measuring pressure signals from the reservoir or aquifer, which requires access to monitoring wells. An alternative approach has been developed that measures the strain in the vadose zone instead of pressure in the reservoir. An instrument has been developed at Clemson University that can measure small strains using optical …
Investigation Into The Load Transfer Mechanism Of Trees To Develop An Innovative Foundation Configuration Using 3d Finite Element Modeling, Kaleb Boland
All Theses
This study was inspired by a tree’s reliance on its root system that enables it to withstand a natural disaster, such as an extreme hydroclimatic event or hurricane. This curiosity has led to an investigation into what makes this possible, developing a new and innovative foundation configuration for infrastructure systems, and a new possible construction material and method. This study provides results on a material that does not have conventional testing procedures or standards: a tree root. The trees studied are common to the upstate of South Carolina, which are Pine, Sweetgum, and White Oak. According to the results, on …
Permeability Evolution In The Initial Period Of Oil Production Based On Field Well Test Data And Coreflooding Tests, Kozhevnikov Evgenii V., Turbakov Mikhail S., Riabokon Evgenii P., Gladkikh Evgeniy A., Poplygin Vladimir V., Guzev Mikhail A., Cheng-Zhi Qi
Permeability Evolution In The Initial Period Of Oil Production Based On Field Well Test Data And Coreflooding Tests, Kozhevnikov Evgenii V., Turbakov Mikhail S., Riabokon Evgenii P., Gladkikh Evgeniy A., Poplygin Vladimir V., Guzev Mikhail A., Cheng-Zhi Qi
Rock and Soil Mechanics
Permeability prediction during hydrocarbon production is a rather important problem. The decrease in permeability due to depletion reserves and the drop in reservoir pressure (increase in effective pressure) leads to an increase in the time of oil or gas production. A large number of works have been devoted to the problem of permeability reduction due to effective pressure. Establishment of permeability models is carried out by various methods including coreflooding tests and field well tests. The results of previous studies have shown that permeability has a power-law or exponential dependence on effective pressure, however, the difficulty in predicting permeability is …
Long-Term Deformation Test And Model Study Of One-Dimensional Consolidation Of South China Sea Coral Mud Under Graded Loading And Unloading, Yang Shen, Jue Deng, He Weng, Long Yang
Long-Term Deformation Test And Model Study Of One-Dimensional Consolidation Of South China Sea Coral Mud Under Graded Loading And Unloading, Yang Shen, Jue Deng, He Weng, Long Yang
Rock and Soil Mechanics
South China Sea coral mud is a calcareous ooze of marine rock and soil formed by the accumulation of bones and debris after the death of coral groups, which has special engineering properties. It is significant to investigate its time dependent long-term nonlinear deformation under load for the construction and long-term stability analysis of dredger fill islands and reefs. Three groups of one-dimensional consolidation compression tests of coral mud with different loading and unloading schemes were carried out, and the influence of stress history on its long-term deformation properties was explored by changing the loading time and loading-unloading loops. According …
Effect Of Rubber–Sand Mixture Gradation On Shear Characteristics Of Mixed Soil, Fei-Yu Liu, Hao-Ze Li, Jun Fu, Hong-Lei Sun
Effect Of Rubber–Sand Mixture Gradation On Shear Characteristics Of Mixed Soil, Fei-Yu Liu, Hao-Ze Li, Jun Fu, Hong-Lei Sun
Rock and Soil Mechanics
To study the shear characteristics of rubber–sand mixtures, the effects of four rubber–sand mixture gradations (one type of gap gradation, two types of continuous gradations, and one type of open gradation), three rubber contents (10%, 30%, and 60%), and three vertical stresses (30 kPa, 60 kPa, and 90 kPa) on the strength and volumetric change characteristics of rubber–sand mixtures were investigated by using a large-scale laboratory direct shear apparatus. Then, the discrete element models of pure sand and rubber–sand mixtures were established according to the same gradation and rubber content. The intrinsic mechanism of rubber–sand mixtures was explored from the …
Deformation And Load Transmission Mechanism Of Prestressed Reinforced Embankment Subjected To Rockfall Impacts, Shu-Wen Ma, Liang Lu, Zong-Jian Wang, Jing-Tian Wang, Lan-Xing Li
Deformation And Load Transmission Mechanism Of Prestressed Reinforced Embankment Subjected To Rockfall Impacts, Shu-Wen Ma, Liang Lu, Zong-Jian Wang, Jing-Tian Wang, Lan-Xing Li
Rock and Soil Mechanics
The prestressed reinforced soil structure was proposed to solve the problem of large-area depressions of soil highways under rockfall impacts in remote mountain areas. Comparative model tests for prestressed reinforced soil embankment and traditional soil embankment were conducted to explore the deformation performance, mechanical response, and load transmission mechanism of both embankments under rockfall impacts. The results show that the size of pits formed in prestressed reinforced soil embankment is significantly smaller than that in traditional soil embankment, which reflects the good impact deformation resistance of prestressed reinforced soil embankment. The embankment stiffness increases with the increase of impact times, …
Excavation Response Analysis Of Prefabricated Recyclable Support Structure For Water-Rich Silt Foundation Pit, Rui-Song Wang, Cheng-Chao Guo, Pei-Yuan Lin, Fu-Ming Wang
Excavation Response Analysis Of Prefabricated Recyclable Support Structure For Water-Rich Silt Foundation Pit, Rui-Song Wang, Cheng-Chao Guo, Pei-Yuan Lin, Fu-Ming Wang
Rock and Soil Mechanics
The prefabricated recyclable support structure provides a new green support system with economic security, functional coordination and sustainable development for the development of underground space. The physical model test of the foundation pit of a pipe-jacking working well in Zhengzhou city is carried out based on the similarity theory. A three-dimensional fluid-solid coupling model that can differentiate the deformation difference between rigid and flexible components in the support system is established by using the ABAQUS software. The stress and deformation characteristics of support structure in the process of dewatering and excavation are analyzed. The influences of dewatering and excavation on …
Stress Jumping Of Elastic-Brittle Circular Coal Roadway And Prediction Model Of Rock Burst, Shu-Wen Wang, Wen-Jun Ju, Chun-Hui Zhang, Shi-Jie Su, Chuang Lu
Stress Jumping Of Elastic-Brittle Circular Coal Roadway And Prediction Model Of Rock Burst, Shu-Wen Wang, Wen-Jun Ju, Chun-Hui Zhang, Shi-Jie Su, Chuang Lu
Rock and Soil Mechanics
In order to predict the rock burst disasters of coal roadway, the coal with bump tendency is regarded as a perfectly elastic-brittle material, and the mechanical model of circular coal roadway is established to analyze the distribution characteristics of stress and deformation energy density of surrounding rock of coal roadway, and then the rock burst prediction model of coal roadway is established to predict the rock burst disaster of coal roadway. The results show that the tangential stress and deformation energy density of the surrounding rock of elastic-brittle coal roadway jump at the interface between the elastic zone and the …
Loosening Earth Pressure Based On Triangular Slip Surfaces, Jia-Quan Wang, Jia-Ming Chen, Zhi-Nan Lin, Yi Tang
Loosening Earth Pressure Based On Triangular Slip Surfaces, Jia-Quan Wang, Jia-Ming Chen, Zhi-Nan Lin, Yi Tang
Rock and Soil Mechanics
Soil deformation caused by karst collapse and tunnel excavation often causes uneven settlement, ground collapse and cracking in foundation. Development of approaches to determine the distribution of loose earth pressure at the top of soil structure and analyze the relationship between soil deformation and soil arching effect accurately is of much importance. A series of classical trapdoor tests with different H/B ratios is conducted to reveal the variation law of soil deformation and settlement on the loose earth pressure at the top of the structure. Based on the test results, a mathematical model is proposed to analyze the loose earth …
Study On The Mechanism Of Coal Bursts Induced By Quasi-Resonance Of Roof-Support System, Kai-Xing Wang, Jia-Qi Xue, Yi-Shan Pan, Lin-Ming Dou, Yong-Hui Xiao
Study On The Mechanism Of Coal Bursts Induced By Quasi-Resonance Of Roof-Support System, Kai-Xing Wang, Jia-Qi Xue, Yi-Shan Pan, Lin-Ming Dou, Yong-Hui Xiao
Rock and Soil Mechanics
The mechanism and prevention of coal burst is an important issue in the study of coal mine dynamic disasters. The disturbance of surrounding rocks can trigger the quasi-resonance phenomena of roadway roof support system in close proximity to its resonant state, ultimately inducing impact disasters. This is manifested in three strong quasi-resonant responses, including roof displacement, velocity and acceleration. Based on the support instability and plastic buckling criteria, three safety factors and the corresponding dangerous disturbance frequency ratio interval for the dynamic failure of support are proposed, and the support damping control strategy is given, aiming at the impact disasters …
Centrifugal Experimental Study On Seismic Response Of Bridge Pile Group Foundation In Saturated Sand Field Overlain By Water, Zhi-Xiao Yan, Yu-Run Li, Dong-Sheng Wang, Yong-Zhi Wang
Centrifugal Experimental Study On Seismic Response Of Bridge Pile Group Foundation In Saturated Sand Field Overlain By Water, Zhi-Xiao Yan, Yu-Run Li, Dong-Sheng Wang, Yong-Zhi Wang
Rock and Soil Mechanics
In order to explore the dynamic interaction of the soil−pile group foundation−bridge structure system in saturated sand field overlain by water, a physical similarity model of the vertical (inclined) pile group foundation−bridge structure was designed and manufactured. Centrifuge shaking table tests with seismic wave inputs of different ground motion intensities and characteristics were conducted. The dynamic characteristic indices of pile group foundation−bridge structure were analyzed, and the development of excess pore water pressure in the saturated sand foundation overlain by water and the dynamic response of pile−soil interaction were also investigated. The results indicated that the presence of overlying water …
Relationship Between Macro And Micro Friction Coefficients Of Sandstone Structural Surface Based On Nano-Scratch Test, Shuang Zheng, Rui Yong, Shi-Gui Du, Zhi-Hai He, Zhen Zhong, Ying-Ying Zhang, Su-Gang Sui
Relationship Between Macro And Micro Friction Coefficients Of Sandstone Structural Surface Based On Nano-Scratch Test, Shuang Zheng, Rui Yong, Shi-Gui Du, Zhi-Hai He, Zhen Zhong, Ying-Ying Zhang, Su-Gang Sui
Rock and Soil Mechanics
Basic friction coefficients are important parameters affecting the shear strength of structural surface in rock masses. The basic friction coefficient determined by conventional laboratory test methods is influenced by mineral composition, temperature, and other factors. To systematically reveal the basic frictional properties of structural surfaces, the macro and micro friction coefficients of sandstone were investigated separately, and their relationship was established. First, mineral components and mechanical parameters of the sandstone were determined by X-ray diffraction and nanoindentation tests. Second, the friction coefficient in the macro scale was examined by tilt test and direct shear test, and the direct shear test …
Numerical Study On Failure Path Of Rock Slope Induced By Multi-Stage Excavation Unloading Based On Crack Propagation, Chuan Wang, Xian-Lun Leng, Zhan-Rong Zhang, Chuang Yang, Jian Chen
Numerical Study On Failure Path Of Rock Slope Induced By Multi-Stage Excavation Unloading Based On Crack Propagation, Chuan Wang, Xian-Lun Leng, Zhan-Rong Zhang, Chuang Yang, Jian Chen
Rock and Soil Mechanics
The investigation on failure patterns and paths of cracked rock slopes under excavation unloading is one of the hot issues in the slope engineering field. Accurate identification of the potential failure path is of great significance for excavation safety and support design of the slope. A theoretical method for crack propagation discrimination was embedded into the numerical simulation based on the fracture propagation analysis method, and the quick simulation of initiation, propagation, and coalescence of discontinuous cracks in rock masses was realized through stress intensity factor calculation at crack tip, crack propagation pattern recognition, crack initiation angle derivation, and crack …
An Improved Shear Strength Model Of Unsaturated Soils Over A Wide Suction Range, Yu-Xin Zhao, Xu Li, Sen Lin, Xiao-Meng Wang
An Improved Shear Strength Model Of Unsaturated Soils Over A Wide Suction Range, Yu-Xin Zhao, Xu Li, Sen Lin, Xiao-Meng Wang
Rock and Soil Mechanics
Different types of unsaturated soils are widespread in nature. Due to the differences in grain size and mineral composition, the shear strength characteristics of the unsaturated soils are significantly different over a wide suction range. In order to establish a unified model for predicting the shear strength of different soil types over a wide suction range, a systematic investigation was carried out to examine the effect of soil type on the shear strength of unsaturated soils. An improved shear strength model is proposed based on the advantages of two traditional equations. The proposed model is verified by comparing the published …
Effects Of Cut Depth And Cut Spacing On A Conical Pick In Rock Cutting, Jiu-Bo Liao, Xi-Bing Li, Shao-Feng Wang, Kun Du
Effects Of Cut Depth And Cut Spacing On A Conical Pick In Rock Cutting, Jiu-Bo Liao, Xi-Bing Li, Shao-Feng Wang, Kun Du
Rock and Soil Mechanics
In order to study the effects of different cut depths and cut spacings on cutting force and specific cutting energy acting on a conical pick, the laboratory linear rock cutting tests were carried out on carbonaceous slate and rhyolite clastic rock based on the TRW-300 true triaxial electro-hydraulic servo system and self-designed innovative pick loading platform. Experimental results indicate that there were four types of failure modes on a conical pick in rock cutting, and there was a synergistic effect between two adjacent picks. The mean cutting force linearly increases with the increasing cut depth and cut spacing. The specific …
Penetration Resistance Evolution Characteristics And Mesoscopic Mechanism Of Submarine Pipeline In Sandy Seabed, Yang Yang, Ying-Hui Tian, Chun-Hui Zhang, Rong Wang, Zhi-Chao Wang, Le Wang
Penetration Resistance Evolution Characteristics And Mesoscopic Mechanism Of Submarine Pipeline In Sandy Seabed, Yang Yang, Ying-Hui Tian, Chun-Hui Zhang, Rong Wang, Zhi-Chao Wang, Le Wang
Rock and Soil Mechanics
Understanding the vertical penetration process of submarine pipelines is of fundamental significance for the reasonable assessment of the initial pipeline embedment during installation and safety and stability during service. Geotechnical centrifuge model tests, combined with discrete element method modelling were conducted to investigate penetration resistance evolution characteristics and mesoscopic mechanism of submarine pipeline in sand with different densities under the real stress level. The test results show that for the medium-dense sand, the pipe penetration resistance−embedment curve shows a hardening trend. On the other hand, for the dense sand, the pipe penetration resistance−embedment curve exhibits a periodic softening trend; moreover, …
Seepage Characteristics And Mechanical Response Of Shield Tunnels Under Localized Leakage And Exosmosis, Jia-Chong Xie, Xin Huang, Guo-Long Jin, Zi-Xin Zhang
Seepage Characteristics And Mechanical Response Of Shield Tunnels Under Localized Leakage And Exosmosis, Jia-Chong Xie, Xin Huang, Guo-Long Jin, Zi-Xin Zhang
Rock and Soil Mechanics
In order to address the problem of groundwater infiltration and inner water exosmosis induced by the hydraulic deterioration of lining joints in pressurized shield tunnels, the seepage characteristics and mechanical responses of tunnel lining and surrounding stratum under localized leakage conditions are analyzed through both numerical and analytical methods based on the hydraulic aperture theory. The results show that the analytical solutions derived from the classical image method for a multi-point leakage case match well with the numerical solutions, which verifies the effectiveness of the proposed numerical model of localized leakage. There is a significant difference in the characteristics of …
Three-Dimensional Analysis And Inclinometer Measurements In Deep Circular Excavation In Sand Soil, Hermil Rizki Hanifah, Paulus Pramono Rahardjo, Aswin Lim
Three-Dimensional Analysis And Inclinometer Measurements In Deep Circular Excavation In Sand Soil, Hermil Rizki Hanifah, Paulus Pramono Rahardjo, Aswin Lim
Rock and Soil Mechanics
This paper presents the results of the inclinometer monitoring and back analysis using three-dimensional finite elements in the scale pit deep excavations. Scale pit is a deep circular excavation construction with a depth of −27 m and a total diameter of 26 m. The soil layer above from the final excavation is dominated by a sandy soil layer. The retaining wall construction is a secant pile reinforced with waler beams at each excavation stage. The hardening soil model was used as soil constitutive model. The results of the back analysis show that the trend of wall deflection is close to …