Stability Analysis Method of "Transient" Saturated-unsaturated Slope

被引：0
|
作者：
Qiu X. [1 ,2 ]
Jiang H.-B. [3 ]
Ou J. [4 ]
Liu Z.-W. [1 ]
Chen M. [1 ]
机构：
[1] School of Civil Engineering, Changsha University of Science & Technology, Changsha
[2] Key Laboratory of Road Structure and Materials Transportation Industry, Changsha University of Science & Technology, Changsha
[3] School of Traffic & Transportation Engineering, Changsha University of Science & Technology, Changsha
[4] Team 402, Hunan Provincial Bureau of Geology and Mineral Exploration and Development, Changsha
来源：
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | 2020年 / 33卷 / 09期
基金：
中国国家自然科学基金;
关键词：
transient" saturation-unsaturated; Improved Swedish arc method; Instability mode; Road engineering; Slope stability;
D O I：
10.19721/j.cnki.1001-7372.2020.09.007
中图分类号：
学科分类号：
摘要：
In order to achieve stability of "transient" saturated-unsaturated slopes, a calculation formula was derived for the slope stability coefficient, considering "transient" water pressure, pore water gravity, softening, and unsaturated strength. The "transient" saturation-unsaturated slope stability analysis program, which can automatically locate the position of the sliding surface, is developed. The evolution law of the safety coefficient and instability mode of the "transient" saturated-unsaturated slope is studied by this program. The degree of influence of different factors on the safety factor of the slope is analyzed. The results illustrate that the problem of "transient" saturated-unsaturated slope stability can be effectively solved by the improved Swedish arc method, which can simultaneously consider "transient" water pressure, pore water gravity, softening, and unsaturated strength. When the slope instability mode is changed from deep overall failure to shallow local failure, there is a threshold, which is defined by the depth of the rainfall infiltration zone. When the depth of the rainfall infiltration zone is less than the threshold, the safety factor of the slope decreases rapidly, the maximum depth of the sliding surface decreases rapidly, and the instability mode of the slope appears as deep overall damage. When the depth of the rainfall infiltration zone is greater than the threshold, the safety factor of the slope continues to decrease, the maximum depth of the sliding surface slowly increases, and a sliding zone is formed in the shallow layer of the slope. The instability mode of the slope is characterized by shallow local failure. When the ratio of anti-slip torque to slip torque without considering "transient" water pressure less than the ratio of sliding surface "transient" water pressure and sliding resistance caused by lateral hydraulic water pressure to sliding moment caused by lateral "transient" water pressure of the sliding body, the "transient" water pressure is good for stability, and vice versa. Although the gravity of pore water and softening of soil are detrimental for slope stability, the unsaturated strength impacts it favorably. © 2020, Editorial Department of China Journal of Highway and Transport. All right reserved.
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页码：63 / 75
页数：12
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