长历时降雨入渗对多台阶排土场边坡稳定性影响研究  

Stability analysis of multi-stage dump slope under long time rainfall infiltration

作　　者：甘海阔[1] 周汉民[1] 崔旋[1] 郄永波[1] 

机构地区：[1]北京矿冶研究总院,北京102628

出　　处：《有色金属（矿山部分）》2014年第5期79-84,共6页NONFERROUS METALS(Mining Section）

基　　金："十二五"国家科技支撑计划项目(2012BAK09B03);国家国际科技合作专项项目(2011DFA71990);北京矿冶研究总院科研基金项目(YJ-2012-02)

摘　　要：降雨是边坡滑坡失稳的主要诱发因素之一。由多相土石混合料构成的人工排土场边坡因其滞水蓄水特性,在长历时降雨条件下极易发生滑坡事故。以充沛雨量地区某排土场为例,分析了长历时降雨造成现状单台阶高陡边坡临界失稳的原因。在此基础上,以经优化设计后的多台阶边坡为例,运用非饱和土力学方法,开展长历时降雨条件下瞬态渗流场演化规律及其对边坡稳定性影响研究。研究结果表明,长历时降雨条件下,单台阶浅层滑坡较深层滑坡更易发生失稳,下部台阶边坡受降雨影响的程度较上部台阶更大,停雨阶段各台阶边坡稳定性恢复速率相对较缓。优化控制排土段高和坡度、修建截排水设施等可有效维护排土场边坡的稳定性。Rainfall is one of the major predisposing factors of slope instability.For dump slope made of soilrock-mixture,it＇s more prone to landslide for its water storage under the long time rainfall condition.Through the example of a dump slope which is in the abundant rainfall area,this paper carries out the causes of the high and steep single-stage slope＇s critical instability state.Furthermore,by using the unsaturated soil mechanics method,the evolution of transient seepage and the slope stability of optimized multi-step slope under the long time rainfall condition are also analyzed.The results show that the single stage shallow failure is more likely to occur than the deep whole landslide;Compared with the upper stage slope,the long duration rainfall makes an even greater impact on the lower stage slope＇s pore-water pressure;The stability recovery rate for each stage slope is slow in the rainstop stage;Setting up drainage facilities and making optimized control of slope angle and height can effectively safeguards the stability of the dump slope in abundant rainfall areas.

关 键 词：降雨 排土场 多台阶 渗流场 边坡稳定性 

分 类 号：TD854.6[矿业工程—金属矿开采] TD854.7[矿业工程—矿山开采]