有限元法和极限平衡法结合的某边坡稳定性分析

Stability analysis of a slope by finite element method and limit equilibrium method

有限元法可以有效的模拟出边坡的应力及位移分布,极限平衡法可以得出相对准确的边坡最小安全系数,通过将两种方法有效的结合,可以在边坡稳定性评价中得出更为可靠的结论。以唐山某白云石矿露天采场为研究对象,通过有限元法以及极限平衡法模拟了该采场边坡在正常工况、洪水(降雨)工况以及地震工况下的稳定性。结果表明:在正常工况下,岩质边坡各个计算断面抗滑安全系数均大于规范要求的抗滑安全系数,表明该边坡在正常工况下可以安全运行;在洪水(降雨)工况以及地震工况下,岩质边坡各个计算断面抗滑安全系数均大于规范要求的抗滑安全系数,但边坡B—B′断面在这两种工况下抗滑安全系数偏小,表明该岩质边坡B—B′断面在洪水(降雨)作用以及地震作用下安全储备不高;综合分析3种工况下的边坡稳定性,建议对该边坡B—B′断面所在位置采取相应的加固措施,以确保该露天采场的安全运行。

The finite element method can effectively simulate the stress and displacement distribution of the slope,and the limit equilibrium method can obtain the relatively accurate minimum safety coefficient of the slope.By combining the two methods,a more reliable conclusion can be drawn in the evaluation of slope stability.Taking an open stope of a dolomite mine in Tangshan as the research object,the stability of the slope under normal working conditions,flood(rainfall)and earthquake conditions was simulated by finite element method and limit equilibrium method.The results show that:under normal working conditions,the anti-sliding safety coefficient of each calculated section of the rock slope is larger than that required by the specification,indicating that the slope can operate safely under normal working conditions,under the condition of flood(rainfall)and earthquake,the anti-sliding safety coefficient of each calculated section of the rock slope is greater than the anti-sliding safety coefficient required by the specification,but the anti-sliding safety coefficient of the B—B′section of the slope is relatively small in this condition,indicating that the B—B′section of the rock slope is poorer in safety reserve under the action of flood(rainfall)and earthquake,based on the comprehensive analysis of the slope stability under three working conditions,it is suggested that the corresponding reinforcement measures should be taken for the B—B′section of the slope to ensure the safe operation of the open stope.