降雨条件下多级台阶排土场边坡渗流及稳定性分析  

Seepage and stability analysis of multi-step dump slope under rainfall condition

作　　者：和江宏 周罕 陈安[1] 李嘉淇 付俊 李林 孔德彪 HE Jianghong;ZHOU Han;CHEN An;LI Jiaqi;FU Jun;LI Lin;KONG Debiao(Kunming University of Science and Technology,Kunming 650093,China;China Nonferrous Metal Industry Kunming Survey and Design Institute Co.,Ltd.,Kunming 650032,China;Yunnan Phosphate Chemical Group Co.,Ltd.,Kunming 650600,China;Yunnan Institute Building Research Co.,Ltd.,Kunming 650223,China)

机构地区：[1]昆明理工大学,昆明650093 [2]中国有色金属工业昆明勘察设计研究院有限公司,昆明650032 [3]云南磷化集团有限责任公司,昆明650600 [4]云南省建筑科学研究院有限公司,明明650223

出　　处：《有色金属（矿山部分）》2023年第5期89-97,共9页NONFERROUS METALS(Mining Section）

基　　金：云南省万人计划产业技术领军人才科技项目(云发改人事〔2019〕274号)。

摘　　要：降雨是导致边坡失稳的主要因素之一。以滇中地区某磷矿排土场边坡为例,研究持续降雨对6#排土场边坡的稳定性影响,基于饱和-非饱和土渗流理论,使用室内非饱和土静力三轴试验结合GeoStudio有限元方法,对持续强降雨条件下的饱和-非饱和渗流场的动态变化、变形破坏和稳定性进行数值模拟和计算。结果表明:降雨初期基质吸力越大边坡安全系数越高,但是降雨12 h后边坡岩土体趋于饱和后,安全系数基本不受基质吸力的影响,并与理论计算结果基本一致,边坡整体稳定性良好,与排土场实际情况相符;雨水不断入渗时多级台阶排土场塑性变形区域主要集中在坡脚台阶处。模拟结果总体可靠,可为持续强降雨地区多级台阶排土场以及对滇中地区矿山排土场安全生产提供参考。Rainfall is one of the main factors leading to slope instability.In this paper,taking the slope of a phosphate mine dump in central Yunnan as an example,the influence of continuous rainfall on the stability of the 6^(#)dump slope is studied.Based on the theory of saturated-unsaturated soil seepage,the dynamic change,deformation failure,and stability of saturated-unsaturated seepage field under continuous heavy rainfall are simulated and calculated by using the indoor unsaturated soil static triaxial test combined with GeoStudio finite element method.The results show that the greater the matrix suction in the initial stage of rainfall,the higher the safety factor of the slope.However,after 12 hours of rainfall,the safety factor is basically not affected by the matrix suction and is basically consistent with the theoretical calculation results.The overall stability of the slope is good,which is consistent with the actual situation of the dump.When rainwater infiltrates continuously,the plastic deformation area of multi-level bench dump is mainly concentrated at the foot of the slope.The simulation results are generally reliable,which can provide reference for the safety production of multi-step dumps in continuous heavy rainfall areas and mine dumps in central Yunnan.

关 键 词：排土场 降雨 饱和-非饱和渗流 有限元 稳定性分析 堆载 数值模拟 GeoStudio 

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