Analysis of Fissured Expansive Soil Slope Stability and its Reinforcement with Anti-Slippery Piles

2013 ◽  
Vol 275-277 ◽  
pp. 1489-1492 ◽  
Author(s):  
Hui Sun ◽  
Bo Hu ◽  
Guo Qiang Zhang
Keyword(s):  
Slope Stability ◽  
Expansive Soils ◽  
Limit Equilibrium ◽  
Expansive Soil ◽  
Water Diversion ◽  
Soil Slope ◽  
Water Diversion Project ◽  
North Water ◽  
Channel Slope ◽  
The Stability

Fissure is one of the most important characteristics in expansive soil. It’s an important factor affecting slope stability in the expansive soil area. With the study of expansive soils typical channel slope fissured characters in the South-to-North Water Diversion Project, different impaction on slope stability such as location and inclination of the fissure are analyzed. By using the limit equilibrium method, the stability of expansive soil slope is analyzed; the most adverse condition of expansive soil slope is concluded. Then anti-slippery pile reinforcement in expansive soil channel slope is studied by using finite difference method. The research is of great significance to the construction and reinforcement of expansive soil slopes in South-to-North Water Diversion Project.

scholarly journals Strength Characteristics and Slope Stability Analysis of Expansive Soil with Filled Fissures

2020 ◽  
Vol 10 (13) ◽  
pp. 4616 ◽  
Author(s):  
Zhangjun Dai ◽  
Jianhua Guo ◽  
Hongming Luo ◽  
Jian Li ◽  
Shanxiong Chen
Keyword(s):  
Stability Analysis ◽  
Slope Stability ◽  
Modular Design ◽  
Expansive Soils ◽  
Expansive Soil ◽  
Triaxial Tests ◽  
Sliding Surface ◽  
Inclination Angles ◽  
North Water ◽  
The Stability

Fissured expansive soils were widely distributed in the South-to-North Water Transfer Project. Most of the fissures were filled with clay, which controlled the stability of the slope. With the method of layered filling—bevel cutting—refilling and a modular design idea, the sample with a filled fissure preparation device for triaxial test was designed. After setting the filled fissures of gray-green clay in the expansive soil, triaxial tests were carried out for the samples with no filled fissures and with filled fissures with inclination angles of 15°, 30°, and 45°. Then, considering the spatial distribution and the strength of the filled fissures in the slope, the stability analysis method for the expansive soil slope with filled fissures was proposed. The stability of a typical slope in Nanyang was analyzed. The results show that the c of expansive soil with filled fissures was about 12 to 15 kPa and the φ was 3° to 6°. Filled fissures had an attenuation effect on the strength of the expansive soil. The larger the inclination of filled fissures, the more significant the effect of soil strength attenuation. The fissured slope stability was controlled by the filled fissures. The sliding surface was affected by the vertical fissures on the top of the slope and the slow-inclined long-large fissures in the slope, and the shape of the sliding surface was a broken line, which was basically consistent with the actual landslide.

scholarly journals Field test study on expansive soil canal of middle route of South to North Water Diversion Project

2016 ◽  
Vol 2 (75) ◽  
pp. 2600-2605
Author(s):  
Biwei Gong ◽  
Zhanlin Cheng ◽  
Jun Tong ◽  
Jun Liu ◽  
Ming Liu
Keyword(s):  
Field Test ◽  
Expansive Soil ◽  
Water Diversion ◽  
Test Study ◽  
Water Diversion Project ◽  
North Water

scholarly journals Performance estimation of a shallow foundation on an unsaturated expansive soil slope subjected to rainfall infiltration

2021 ◽  
Vol 337 ◽  
pp. 03009
Author(s):  
Mengxi Tan ◽  
Sai K. Vanapalli
Keyword(s):  
Slope Stability ◽  
Limit Equilibrium ◽  
Expansive Soil ◽  
Rainfall Infiltration ◽  
Performance Estimation ◽  
Shallow Foundation ◽  
Water Infiltration ◽  
Rational Approach ◽  
Soil Slope ◽  
Unsaturated Expansive Soil

In the last two decades, there has been a significant increase in infrastructure development on slopes of hilly regions of the world, due to population growth. There are many infrastructures on unsaturated expansive slopes, especially in semi-arid and arid regions. Rainfall infiltration is one of the major factors that contributes to the slope and infrastructure foundations failures on hilly slopes with unsaturated expansive soils. In the current study, a rational approach is proposed considering the combined influence of the foundation-slope behavior based on the principles of unsaturated soil mechanics. This is achieved by a novel numerical modelling approach using the commercial software Geo-studio to investigate the performance of strip foundation located on the top of the unsaturated expansive soil slope subjected to various rainfall infiltration conditions. Hydro-mechanical coupling analysis is conducted to evaluate the rainfall water infiltration influence combined with slope stability analysis using limit equilibrium method. Comparisons are made between both the foundation bearing capacity, slope stability before and after rainfall water infiltration. Different failure mechanisms of the foundation and slope system are presented with and without foundation loading for various rainfall scenarios. Results summarized in this paper are helpful for the geotechnical engineers for understanding the performance of shallow foundations on unsaturated expansive soil slopes considering the influence of rainfall infiltration conditions.

scholarly journals Strength Characteristics and Slope Stability of Expansive Soil from Pingdingshan, China

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Ju-yun Zhai ◽  
Xiang-yong Cai
Keyword(s):  
Shear Strength ◽  
Slope Stability ◽  
Expansive Soil ◽  
Friction Angle ◽  
Natural Soil ◽  
Soil Slope ◽  
The Finite Element Method ◽  
Shear Strength Parameters ◽  
Strength Parameters ◽  
The Stability

By analyzing the characteristics of expansive soil from Pingdingshan, China, the shear strength parameters at different water contents, dry densities, and dry-wet cycles of expansive soil are obtained. It is found that, at higher soil-water content, the internal friction angle is 0° and the shallow layer of expansive soil slope will collapse and destroy; this has nothing to do with the height of the slope and the size of the slope. The parameters of soil influenced by atmosphere are the ones which have gone through dry-wet cycles, and the parameters of soil without atmospheric influence are the same as those of natural soil. In the analysis of slope stability, the shear strength parameters of soil can be determined by using the finite element method, and the stability coefficient of the expansive soil slope can be calculated.

Wetting-Drying Effect of Expansive Soils and its Influence on Slope Stability

2012 ◽  
Vol 170-173 ◽  
pp. 889-893 ◽  
Author(s):  
Zhao Tian Zeng ◽  
Hai Bo Lu ◽  
Yan Lin Zhao
Keyword(s):  
Stability Analysis ◽  
Slope Stability ◽  
Expansive Soils ◽  
Expansive Soil ◽  
Observation Data ◽  
Atmospheric Effect ◽  
Cycle Number ◽  
Constant State ◽  
The Stability ◽  
Number Of Cycles

The wetting-drying effect of expansive soils plays an important role in slope stability analysis. According to the depth of atmospheric effect and the field observation data of moisture content, laboratory experiments on the strength of expansive soil with two wetting-drying cycle amplitudes were performed to discuss on the wetting-drying effect of expansive soil. The results show that the shear strength of expansive soil decreases with increasing number of cycles and finally reaches to a constant state. The value and cycle number of the constant state reduce with increase of amplitude of variation of water content. Furthermore, the stability analysis of expansive soil slope is studied with considering the wetting-drying effect. The results may provide the reference for the parameter selection in slope design.

A Study on the Settlement Character of High Fill Channels

2014 ◽  
Vol 513-517 ◽  
pp. 2639-2642
Author(s):  
Yu Zhang ◽  
Fei Yu ◽  
Shan Xiong Chen ◽  
Xiao Jie Chu ◽  
Zhang Jun Dai
Keyword(s):  
Structural Stability ◽  
Deformation Rate ◽  
Water Channel ◽  
Great Influence ◽  
Water Diversion ◽  
Settlement Development ◽  
The North ◽  
Water Diversion Project ◽  
North Water ◽  
Channel Slope

The settlement of high fill channels has great influence on the structural stability of the impervious panels in the North Water Diversion Project. For the high fill channels, the settlement study on the filling body and water channel slope of the channels after the completion of the filling is systematically carried out. The study result shows that the post-settlement development law of the channels accord with the hyperbolic, the settlement of the slope is uneven, and the deformation and the deformation rate of the slope is mainly controlled by vertical settling.

Numerical Simulation of the Stability of Added Lime Expansive Soils Embankment

2013 ◽  
Vol 838-841 ◽  
pp. 821-824
Author(s):  
Qi Yong You
Keyword(s):  
Expansive Soils ◽  
Expansive Soil ◽  
Soil Slope ◽  
Slope Ratio ◽  
Embankment Slope ◽  
Calculation Results ◽  
Expansion Force ◽  
The Stability ◽  
Depth Of Infiltration ◽  
Reasonable Model

The main reason of expansive soil embankment slope landslide is the infiltration of rainwater. Analyzing engineering characteristics and failure mechanism of expansive soil embankment slope, considering the force of expansion under the infiltration of rainwater, and choosing the appropriate constitutive model, simulate expansive soil embankment slope under humidification state. According different conditions of the expansive soil and different depth of infiltration, and simplifying the swelling force, establish a simple and reasonable model of expansion force changes. Expansive soil embankment slope stability is mainly affected by the moisture of expansive soil slope after analyzing the calculation results. The safety of expansive soil slope after immersion in rainwater decreases significantly. It shows designers should choose reasonable slope ratio and consider the embankment slope protection and drainage measures.

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