Study on different slope shapes and stability under same slope angle

doi:10.16265/j.cnki.issn1003-3033.2022.S1.0837

Abstract

Abstract:

In order to study the influence of different slope forms on the stability of quasi-homogeneous soil slope under the same slope angle, taking quasi-homogeneous soil slope as an engineering example, based on the theoretical analysis of strength reduction and limit equilibrium, FLAC^3D and SLOPE/W were applied to determine the slope failure mechanism and evaluate the stability. The results show that when the slope height is 50 m, the slope angle of the step is 70°, and the step height is 10 m and 5 m, respectively, equal flat plate, and the different potential effects of the slope angle of 15, 20 and 25° were studied respectively. The stability coefficient of the slope with a height of 10m is 0.037-0.516 larger than that of 5 m. Through the simulation calculation of different landslide modes, the stability coefficient of the optimal arc submerged landslide mode for the same slope angle is the smallest. When the slope angle is less than 20°, the stability coefficient is the largest in the arc sliding mode. When the slope angle is greater than 25°, the stability coefficient is the largest in the linear-base sliding mode.

Key words: same slope angle, slope shape, slope stability, limit equilibrium method, strength reduction, landslide pattern

ZHAO Lichun, LIU Yongjie, ZONG He, XU Yongchao, WANG Bo, QI Limin. Study on different slope shapes and stability under same slope angle[J]. China Safety Science Journal, 2022, 32(S1): 140-144.

Figures/Tables 5

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References 15

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岩层	容重γ/ (kN·m^-3)	黏聚力 c/kPa	内摩擦角 φ/(°)	弹性模量 E/MPa	泊松比
类均质土体	17.7	20	17	30	0.45
基底	30.0	100	30	108	0.35

边坡角/ (°)	滑坡模式	边坡稳定系数
边坡角/ (°)	滑坡模式	台阶高度10 m	台阶高度5 m
15	优化圆弧	1.883	1.695
	圆弧	4.950	4.434
	直线-基底	1.961	1.858
20	优化圆弧	1.354	1.304
	圆弧	2.419	2.181
	直线-基底	1.798	1.671
25	优化圆弧	1.105	1.068
	圆弧	1.137	1.078
	直线-基底	1.392	1.339