FLAC与极限平衡法联合分析高陡矿山边坡稳定性的应用研究

基于极限平衡法、强度折减法和重度增加等方法,结合岩土工程中现有边坡计算和分析方法的特点,研究了强度折减法和极限平衡法的基本原理和适用条件。对于某矿山300m高陡边坡,采用基于强度折减FLAC数值模拟方法和极限平衡法,分析两种不同开挖方案下矿山高陡边坡的稳定性,确定相应的边坡稳定系数和最危险截面,为选择合理的开挖方案提供依据。根据研究结果,通过FLAC数值模拟与极限平衡法得出的稳定安全系数,二者计算结果相近、最危险滑动面也类似;但是FLAC数值模拟可更精确、有效地模拟边坡的塑性破坏和塑性流动,并可得到边坡滑动体的形状和位置。

Application Research of FLAC and Limit Equilibrium Method to Analyze the Stability of High and Steep Mine Slopes

Based on the methods of limit equilibrium method,strength reduction method and weight increase,combined with the characteristics of existing slope calculation and analysis methods in geotechnical engineering,the basic principles and applicable conditions of strength reduction method and limit equilibrium method were studied.For a 300m high and steep slope in a certain mine,the strength-reduced FLAC numerical simulation method and limit equilibrium method are used to analyze the stability of the mine high and steep slope under two different excavation schemes to determine the corresponding slope stability coefficient and the most dangerous sections and provide a basis for selecting a reasonable excavation scheme.According to the research results,the stability safety coefficient obtained by FLAC numerical simulation and limit equilibrium method is similar,and the most dangerous sliding surface is similar;but FLAC numerical simulation can more accurately and effectively simulate the plastic failure and plasticity flow of the slope,and the shape and position of the slope sliding body can be obtained.