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采用现场调查和数值分析相结合的方法,基于简化Bishop法极限平衡理论,对排土场4个边坡剖面分别考虑正常、暴雨和特殊3种工况,共进行24次边坡静力和地震动力稳定性计算分析,并以安全系数表征。根据排土场安全度,分3种计算工况提出了稳定性分级标准,在此基础上预测了临界安全系数值对应的总边坡角。结果表明:局部高陡边坡对边坡整体稳定性的影响主要发生在暴雨和特殊工况下,正常工况时影响不大;数值计算得出的最危险滑动面均发生在过高和过陡的局部台阶位置,与现场勘查结果吻合;当前边坡总坡角每上升2°,安全系数平均降低了一个等级。
Based on the simplified Bishop limit equilibrium theory, the four sections of the dump are considered normal, heavy rain and special conditions respectively. A total of 24 slope static and earthquakes Dynamic stability calculation and analysis, and the safety factor is characterized. According to the safety of the dump, stability classification standards are proposed in three kinds of calculation conditions. Based on this, the total slope angle corresponding to the critical safety factor is predicted. The results show that the influence of local high steep slope on the overall stability of the slope occurs mainly under heavy rainfall and special conditions, and has little effect under normal conditions. The most dangerous slip surfaces calculated by numerical calculation all occur in excessively high and excessive The location of the steep local step agrees well with the result of the site survey; for each 2 ° increase in the total slope angle of the current slope, the safety factor is reduced by an average of one level.