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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 …
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 …
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 …
Rapid Prediction Method Of Soil-Water Characteristic Curve Of Yan’An Compacted Loess, Hai-Man Wang, Wan-Kui Ni, Kui Liu
Rapid Prediction Method Of Soil-Water Characteristic Curve Of Yan’An Compacted Loess, Hai-Man Wang, Wan-Kui Ni, Kui Liu
Rock and Soil Mechanics
The traditional SWCC test method is time-consuming, and it is of great practical significance to develop a method that can quickly determine the SWCC of unsaturated soil. In order to predict the SWCC of compacted loess rapidly, the water potential and moisture content of compacted loess with different dry densities were tested, and the pore size distribution curve was measured using nuclear magnetic resonance (NMR) technology. Based on the test results, a rapid prediction method of the soil-water characteristic curve of Yan’an compacted loess was established based on the void ratio, and its accuracy was verified by the measured data. …
Analytical Solution To Consolidation Of Unsaturated Soil By Vertical Drains With Continuous Permeable Boundary, Ai-Fang Qin, Liang-Hua Jiang, Wei-Fang Xu, Guo-Xiong Mei
Analytical Solution To Consolidation Of Unsaturated Soil By Vertical Drains With Continuous Permeable Boundary, Ai-Fang Qin, Liang-Hua Jiang, Wei-Fang Xu, Guo-Xiong Mei
Rock and Soil Mechanics
In this paper, based on the axisymmetric consolidation theory of unsaturated soil and equal-strain assumption, an analytical solution using the homogenization of boundary conditions and eigenfunction method is proposed to three-dimensional consolidation of unsaturated soil enhanced by vertical drains under instantaneous loading, in which the continuous permeable boundary conditions are properly introduced. Then, the proposed solution is verified by the special cases of double drainage boundary conditions. Finally, the solution is analyzed using examples and the results show that the proposed solution can be used to simulate the arbitrary distribution of permeability of the top and bottom boundary by setting …
Hysteresis Incremental Model Of Soil-Water Characteristic Curve Based On Pore Expansion And Contraction, Chen Ke, Cao Wen-Gui, Chen He
Hysteresis Incremental Model Of Soil-Water Characteristic Curve Based On Pore Expansion And Contraction, Chen Ke, Cao Wen-Gui, Chen He
Rock and Soil Mechanics
The void ratio of soil has an important influence on the soil-water characteristic curve (SWCC) of unsaturated soil. Experimental studies have shown that pores expand or contract under different hydraulic load paths, which results in the hysteresis of the soil-water characteristic curve (SWCC). Based on this finding, this paper assumes that the expansion and contraction of pores can cause the hysteresis of the soil-water characteristic curve (SWCC). In this study, axial translation technique is employed as an example to explain the expansion and contraction of soil pores under hydraulic loading. Then, an incremental equation for the soil-water characteristic curve that …
Calculation Of Mean Intergranular Stress And Its Application In Unsaturated Soil, Zhao-Yang Song, Cheng-Gang Zhao, Chang-Fu Wei, Tian-Tian Ma
Calculation Of Mean Intergranular Stress And Its Application In Unsaturated Soil, Zhao-Yang Song, Cheng-Gang Zhao, Chang-Fu Wei, Tian-Tian Ma
Rock and Soil Mechanics
The physicochemical interactions between different phases of the soil have an important impact on the geotechnical engineering related to environment and energy. The principle of effective stress is always the most important and effective theory to solve the relevant problems. However, the change of inter-particle stress caused by physicochemical effects cannot be accurately described by current effective stress equation. In response to the above problems, a mean intergranular stress expression that uniformly describe capillary, adsorption and osmosis effects between soil particles has recently been proposed. The purpose of this research is to realize the quantitative calculation of the mean intergranular …