In slope stability analysis, the limit equilibrium method is usually used to calculate the safety factor of slope based on Mohr-Coulomb criterion. However, Mohr-Coulomb criterion is restricted to the description of rock mass. To overcome its shortcomings, this paper combined Hoek-Brown criterion and limit equilibrium method and proposed an equation for calculating the safety factor of slope with limit equilibrium method in Hoek-Brown criterion through equivalent cohesive strength and the friction angle. Moreover, this paper investigates the impact of Hoek-Brown parameters on the safety factor of slope, which reveals that there is linear relation between equivalent cohesive strength and weakening factor D. However, there are nonlinear relations between equivalent cohesive strength and Geological Strength Index (GSI), the uniaxial compressive strength of intact rock σ ci, and the parameter of intact rock m i. There is nonlinear relation between the friction angle and all Hoek-Brown parameters. With the increase of D, the safety factor of slope F decreases linearly; with the increase of GSI, F increases nonlinearly; when σ ci is relatively small, the relation between F and σ ci is nonlinear, but when σ ci is relatively large, the relation is linear; with the increase of m i, F decreases first and then increases.
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机译:在边坡稳定性分析中,通常采用极限平衡法根据Mohr-Coulomb准则计算边坡的安全系数。但是,Mohr-Coulomb准则仅限于描述岩体。为克服上述缺点,本文将Hoek-Brown准则与极限平衡法相结合,提出了通过等效粘结强度和摩擦角,采用Hoek-Brown准则中极限平衡法计算边坡安全系数的公式。此外,本文研究了Hoek-Brown参数对边坡安全系数的影响,表明等效内聚强度与弱化系数D之间存在线性关系。但是,等效内聚强度与地质强度指标之间存在非线性关系( GSI),完整岩石的单轴抗压强度σci和完整岩石的参数mi。摩擦角与所有Hoek-Brown参数之间存在非线性关系。随着D的增加,边坡F的安全系数线性减小;随着GSI的增加,F非线性地增加;当σci较小时,F与σci的关系为非线性;而当σci较大时,则为线性。随着m i em>的增加, F em>先减小然后增加。
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