降雨对饱和——非饱和状态下排土场边坡稳定性影响  

Influence of Rainfall on the Stability of Dump Slope under Saturated-unsaturated State

作　　者：王恒 WANG Heng(Yunnan Xiangfeng Chemical Fertilizer Co.,Ltd.)

机构地区：[1]云南祥丰化肥股份有限公司,云南省昆明市650300

出　　处：《现代矿业》2024年第6期94-98,共5页Modern Mining

摘　　要：降雨条件下,由于水的入渗和土体容重的变化,排土场边坡稳定性受到挑战。基于Van Genuchten模型和Morgenstern-Price法对案例排土场进行降雨工况下饱和—非饱和渗流场分析,考虑废石土基质吸力,研究降雨对排土场边坡稳定性的影响。结果表明:饱和—非饱和状态下的排土场降雨工况稳定性是复杂的,降雨对处于非饱和状态下排土场渗流场的影响具有明显的滞后过程。降雨刚结束时,坡内会在少量雨水渗入下形成局部暂态饱和区;降雨结束一段时间后,坡内雨水入渗量加大,暂态饱和区范围不断缩小,局部地下水位有所抬升。边坡稳定性最低安全系数并不对应着降雨工况的最高浸润线时态,非饱和介质基质吸力的降低对排土场边坡稳定性影响明显。Under the condition of rainfall,due to the infiltration of water and the change of soil bulk density,the stability of dump slope is challenged.Based on the Van Genuchten model and Morgenstern-Price method,the saturated-unsaturated seepage field of the case dump under rainfall conditions is ana⁃lyzed.Considering the matric suction of waste rock soil,the influence of rainfall on the stability of the dump slope is studied.The results show that the stability of rainfall conditions in the saturated-unsaturated state is complex,and the influence of rainfall on the seepage field of the dump in the unsaturated state has an obvi⁃ous lag process.When the rainfall is just over,a local transient saturated zone will be formed in the slope un⁃der the infiltration of a small amount of rainwater.After a period of rainfall,the amount of rainwater infiltra⁃tion in the slope increases,the range of transient saturated zone shrinks,and the local groundwater level ris⁃es.The minimum safety factor of slope stability does not correspond to the time state of the highest saturation line under rainfall conditions.The decrease of matric suction in unsaturated medium has obvious influence on the stability of dump slope.

关 键 词：排土场 边坡稳定性 饱和—非饱和土体 基质吸力 

分 类 号：TD804[矿业工程—矿山开采]