基于Hoek-Brown强度折减法的边坡稳定性图表法研究

doi:10.13722/j.cnki.jrme.2017.1361

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Abstract Stability charts provide a simple and effective way to evaluate the preliminary slope stability. Using the Hoek-Brown strength reduction FEM，this paper presents a series of stability charts to determine the safety factor of rock mass slopes satisfying the Hoek-Brown criterion. Firstly，the explicit formula of instantaneous Mohr- Coulomb friction angle and cohesive strength are derived based on the normal and shear stresses relationship of the Hoek-Brown criterion. Then，implementation of the non-linear Hoek-Brown strength reduction method is achieved in slope stability calculations. An example analysis shows that the Hoek-Brown strength reduction method can obtain a reliable safety factor and slip surface，but avoid determining instantaneous friction angle ?i and cohesive strength ci through iteration analysis. On this basis，stability charts for calculating the safety factors with a specified slope angle ? = 45°and disturbance factor D = 0 are proposed. Then，the disturbance weighting factor fD and the slope angle weighting factor f? are established to illustrate the influence of the disturbance factor and slope angle on the stability of rock slopes，respectively，and the charts for determining fD and f? are then provided. Thus，Stability charts for rock mass slopes satisfying the Hoek-Brown criterion are produced. Finally，this method is applied to two real engineering cases，and the results show that the proposed stability charts can be used to determine safety factors of rock mass slopes reliably.

Key words： slope engineering rock slope safety factor strength reduction Hoek-Brown criterion stability charts

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	Articles by authors
	SUN Chaowei1
	CHAI Junrui1
	2
	XU Zengguang2
	QIN Yuan2
	LI Gang1

Cite this article:

SUN Chaowei1,CHAI Junrui1,2, et al. Stability charts for rock slopes based on the method of reduction of Hoek-Brown strength[J]. , 2018, 37(4): 838-851.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2017.1361 OR http://www.rockmech.org/EN/Y2018/V37/I4/838

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