强降雨对高陡岩质边坡稳定性的影响分析  

Analysis of the Influence of Heavy Rainfall to the Stability of High and Step Rock Slope

作　　者：张立博[1,2] 秦哲[3] 付厚利[4] 陈绪新[1,2] 

机构地区：[1]山东科技大学土木工程与建筑学院,山东青岛266590 [2]山东省土木工程防灾减灾重点实验室,山东青岛266590 [3]山东科技大学矿业与安全工程学院,山东青岛266590 [4]临沂大学建筑学院,山东临沂276000

出　　处：《金属矿山》2017年第8期165-169,共5页Metal Mine

摘　　要：针对三山岛露天金矿矿坑高陡岩质边坡稳定性的问题,综合考虑库水位对边坡的水压力、暂态渗流力场、应力场,改进岩质边坡稳定性计算理论;选取边坡487勘探面,运用改进理论结合有限元法计算边坡在水平方向上的位移值,对比运用深孔测斜仪测量的数据,验证该理论的实用性;同时分析降雨在岩质边坡入渗的过程,研究边坡瞬态安全系数随时间变化关系。研究结果表明:边坡在水平方向的理论计算位移值与深孔测斜仪测量值进行对比,发现计算值与实测值基本一致,最大误差为0.02 mm,说明该理论对渗流状态下边坡稳定性分析具有良好的实用性;降雨条件下边坡瞬态安全系数随时间的变化曲线呈"V"形,降雨后的安全系数与降雨前对比减少了10.12%;强降雨入渗引起了地下水位的上升,边坡安全系数最低时,暂态饱和区集中在边坡临空面的5~30 m的范围内。In view of the stability of the high and step rock slope of Sanshandao open-pit gold mine,by considering the influence of water level to water pressure,transient seepage force field,stress field of the slope,the calculating theory of rock slope is improved.Taking the 487 exploration section of the slope as the study example,the displacement of the slope in the horizontal direction is calculated by the improved calculation theory by combing with finite element method,the practicability of the calculation theory improved in this paper is verified by comparing with the measured data obtained by deep hole inclinometer.Besides that,the infiltration process of rainfall in rock slope is analyzed,so as to analyze the change relationship of transient safety coefficient with time.The study results show that： the theoretical calculation results of slope displacement in the horizontal direction is basically consistent with the measured results of deep hole inclinometer,the maximum error between them is only 0.02 mm,which show that the theory improved in this paper can be effectively used to conduct the stability analysis of rock slope; the transient safety factor of rock slope under rainfall conditions are changed with time,and the changing characteristics is presented with ＂ V＂ shape,the slope safety coefficient is decreased over 10.12% compared with the one before rainfall; the rising of underwater level is caused by heavy rainfall; when the slope safety coefficient in the lowest level,the transient saturated zone is centrally distributed in free surface slope with the scope of 5 - 30 m.

关 键 词：岩质边坡 降雨入渗 安全系数 稳定性 

分 类 号：TD854.6[矿业工程—金属矿开采] TU458[矿业工程—矿山开采]