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Civil and Environmental Engineering Commons™
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- Excess pore water pressure (3)
- Shear strength (3)
- Bentonite (2)
- Bridge engineering (2)
- Creep (2)
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- Digital image correlation (2)
- Direct shear test (2)
- Discrete element method (2)
- Expansive soil (2)
- Foundation pit excavation (2)
- Freeze-thaw cycle (2)
- Hydraulic conductivity (2)
- Hydraulic fracturing (2)
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- Mechanical properties (2)
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- Microstructure (2)
- Model test (2)
- Numerical simulation (2)
- Permeability (2)
- Pile foundation (2)
- Rock mechanics (2)
- Seepage (2)
- Seismic response (2)
- Shaking table test (2)
- Shield tunnel (2)
- Skeleton void ratio (2)
- Structural plane (2)
- Unsaturated soil (2)
- 3D finite element (1)
Articles 91 - 99 of 99
Full-Text Articles in Civil and Environmental Engineering
Experimental Study Of Micp-Treated Sand Enhanced By Pozzolan, Yu Xiong, Hua-Feng Deng, Jian-Lin Li, Lei Cheng, Wen-Xi Zhu
Experimental Study Of Micp-Treated Sand Enhanced By Pozzolan, Yu Xiong, Hua-Feng Deng, Jian-Lin Li, Lei Cheng, Wen-Xi Zhu
Rock and Soil Mechanics
In order to improve the reinforcement effect of microbially induced calcium carbonate precipitation (MICP) technology on sand, the test of MICP-treated sand reinforced by pozzolan was designed and carried out considering the porous structure and activity characteristics of pozzolan. The enhancement effect and enhancement mechanism of pozzolan on the MICP-treated sand were systematically analyzed by integrating macroscopic physical and mechanical tests and microscopic tests. The results showed that: 1) Pozzolan could significantly improve the bacteria fixation rate and cementation material production in the process of sand microbial reinforcement, and the optimal amount of pozzolan content was around 10%, which increased …
Mineralogical Evidence Of Alkaline Corrosion Of Montmorillonite In Gmz Bentonite, Yan-Mei Tong, Hu-Yuan Zhang, Guang-Ping Zhou, Xiao-Ya Li
Mineralogical Evidence Of Alkaline Corrosion Of Montmorillonite In Gmz Bentonite, Yan-Mei Tong, Hu-Yuan Zhang, Guang-Ping Zhou, Xiao-Ya Li
Rock and Soil Mechanics
During the operation of underground repository of high-level radioactive waste, the highly alkaline solution generated by groundwater corroding lining concrete will diffuse into the bentonite buffer barrier, resulting in the degradation of barrier property. The KOH solution with different pH values was used to simulate the alkaline solution, and a one-year contact diffusion test at room temperature was conducted. Then, X-ray fluorescence spectroscopy (XRF), X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive spectrometry (EDS) were performed to investigate the effect of slow diffusion on the mineralogy of bentonite. The XRF test results show that when the pH of …
Rock Cutting Characteristics With Single Pick And Prediction Of Cutting Force Based On Force Chain, Lei Dong, Hua Zhang, Ji-Shuang L, Rui-Min Shi
Rock Cutting Characteristics With Single Pick And Prediction Of Cutting Force Based On Force Chain, Lei Dong, Hua Zhang, Ji-Shuang L, Rui-Min Shi
Rock and Soil Mechanics
The pick is the main load-bearing object of the mining machinery for cutting coal. Prediction of the cutting force from the working condition is essential to reduce the wear of the pick. The rock was considered as a granular material for single pick cutting simulation using the particle flow code (PFC2D). The influence of the contact state on the cutting force of the single pick was discussed based on the characteristics of the force chain between particles during rock cutting. The cutting force test was carried out with a single pick cutting test equipment. The variation laws of the cutting …
Multivariate Experimental Study On Soybean Urease Induced Calcium Carbonate Precipitation, Meng Cui, Xiao Fu, Jun-Jie Zheng, Su-Ying L, Hui-Hui Xiong, Chen Zeng, Shang-Yu Han
Multivariate Experimental Study On Soybean Urease Induced Calcium Carbonate Precipitation, Meng Cui, Xiao Fu, Jun-Jie Zheng, Su-Ying L, Hui-Hui Xiong, Chen Zeng, Shang-Yu Han
Rock and Soil Mechanics
The plant-derived enzyme induced calcium carbonate precipitation (EICP) can significantly improve the engineering mechanical properties of sand. However, there is no specification for choosing the parameter value in the specific operation, and the solidification effect needs to be improved. Based on soybean urease, the effects of temperature, urease concentration, urea concentration, calcium concentration, pH value, calcium source type and other variables on urease activity and calcium carbonate precipitation were studied, and the SEM and XRD tests on precipitated calcium carbonate crystals were carried out. On this basis, the unconfined compressive strength and solidification effect of soybean urease-solidified sand were tested. …
Laboratory Investigation On The Effect Of Waste Plastic Bottles Filled With Soil As Transverse Members On Pullout Resistance Of Steel Strip For Reinforcement Fine Sand, Beyranvand Alireza, Hamid Lajevardi Seyed, Ghazavi Mahmoud, Mohammad Mirhosseini Seyed
Laboratory Investigation On The Effect Of Waste Plastic Bottles Filled With Soil As Transverse Members On Pullout Resistance Of Steel Strip For Reinforcement Fine Sand, Beyranvand Alireza, Hamid Lajevardi Seyed, Ghazavi Mahmoud, Mohammad Mirhosseini Seyed
Rock and Soil Mechanics
The aim of this study is to investigate the feasibility of utilizing the waste plastic bottles filled with soil as the transverse element attached to the steel stripe in the Mechanically Stabilized Earth Walls (MSEWs). Transverse members of reinforcement have a major effect on increasing the pullout resistance. This system is comprised of a steel stripe as a longitudinal member and waste plastic bottles filled with soil as transverse members attached to it. To understand this, pullout tests were conducted on one steel strip and seven steel stripes with one to seven bottles. More than 18 laboratory large-scale pullout tests …
Strength And Damage Characteristics Of Tailings Filling Body With Different Particle Size Distributions, Ai-Bing Jin, Jie Wang, Shuai-Jun Chen, Hai Li
Strength And Damage Characteristics Of Tailings Filling Body With Different Particle Size Distributions, Ai-Bing Jin, Jie Wang, Shuai-Jun Chen, Hai Li
Rock and Soil Mechanics
To explore the influence of tailings particle size distribution on strength and damage characteristics of filling body, uniaxial compression, scanning electron microscopy, and digital image correlation (DIC) tests were carried out on the filling body composed of ultrafine tailings (median particle size D50=10.1 m), fine tailings (D50=37.1 m), and coarse tailings (D50=121.31 m), and the strength and microstructure characteristics were analyzed. Based on the cusp mutation theory, the damage identification index of the filling body was established using wavelet packet technology, and the damage characteristics of the filling body were quantitatively analyzed. The results reveal that the strength and elastic …
A New Method For Evaluating Rock Joint Roughness Based On Power Spectral Density, Chuan-Qing Zhang, Yu-Hang Guo, Jin-Shun Xu, Ning Liu, Qi-Ming Xie, Guo-Jian Cui, Hui Zhou
A New Method For Evaluating Rock Joint Roughness Based On Power Spectral Density, Chuan-Qing Zhang, Yu-Hang Guo, Jin-Shun Xu, Ning Liu, Qi-Ming Xie, Guo-Jian Cui, Hui Zhou
Rock and Soil Mechanics
To further improve accuracy and reliability of describing the roughness feature of the structural plane, and more comprehensively reflect influences of the morphological differences, the fluctuation of the profile was decomposed into three principal characteristics: amplitude, inclination, and curvature, which represent the change characteristics of height, angle, and bending of the profile. The data of the three characteristics were obtained by 10 standard profiles established by Barton. And the distribution curves of the three characteristics were analyzed. Then, the power spectral density (PSD), which can well describe the microscopic morphology, was used to analyze the spectral characteristics of amplitude, inclination …
Stability Analysis Of Shield Tunnel Face Considering Spatial Variability Of Hydraulic Parameters, Shuai Yuan, De-Wang Feng, Sen-Hao Zhang, Yun-Peng Xing, Zun-Qi Ke
Stability Analysis Of Shield Tunnel Face Considering Spatial Variability Of Hydraulic Parameters, Shuai Yuan, De-Wang Feng, Sen-Hao Zhang, Yun-Peng Xing, Zun-Qi Ke
Rock and Soil Mechanics
The shield method is commonly employed in the construction of urban subways, and the stability of the excavation surface is extremely important for the safety of tunnel construction. When constructing tunnels in submerged or water-rich strata, the seepage force is a key factor affecting the ultimate support force of excavation faces. Uncertainty of natural geotechnical material hydraulic parameters significantly impacts the seepage force near the face. Based on the classic limit analysis and the random field theory, the principle of effective stress in saturated soil is introduced, and the stochastic numerical limit analysis method considering the influence of pore water …
A Rapid Determination Method Of Hydraulic Conductivity In Full Suction Range, A-Qiang Liu, Xu Li, Yan Liu, Zhi-Yuan Zhang
A Rapid Determination Method Of Hydraulic Conductivity In Full Suction Range, A-Qiang Liu, Xu Li, Yan Liu, Zhi-Yuan Zhang
Rock and Soil Mechanics
The hydraulic conductivity function of unsaturated soil spans several orders of magnitude. Traditional measurement methods often take several months, and it is difficult to measure the hydraulic conductivity in the full suction range. In order to realize the rapid measurement of hydraulic conductivity in the full suction range, the wetting front advancing method is combined with the instantaneous profile method (here referred to as the combined determination method) in this study. A self-developed soil column infiltration device was used to measure the hydraulic conductivity of Qinghai silty clay in the full suction range under different dry densities. The test results …