摘要
基于非饱和渗流理论,采用考虑基质吸力影响的Morgenstern-Price法来分析降雨入渗后弃土场边坡的稳定性,并结合典型弃土场实例,采用seep/w与geo-slope耦合计算降雨渗流6h、12h、18h以及降雨结束后6h弃土场边坡的稳定性。研究表明:由于降雨入渗作用,弃土场最危险滑动面有下移的趋势,在降雨流量强度为边界条件时弃土场边坡安全系数分别下降4.7%、10%。当定水头为边界条件时,弃土场稳定性安全系数降幅最快,为19%;另外降雨结束后,弃土场边坡稳定性仍有小幅下降,即最易失稳时刻表现出一定滞后性。同时认为弃土场边坡失稳除了渗流作用外,还有细颗粒流失后土体组构变化的原因。
Based on the unsaturated seepage theory,the Morgenstern price method considering the influence of matrix suction is used to analyze the slope stability of the dump after rainfall infiltration.Combined with the typical example of the dump,seep/w and geo-slope coupler are used to calculate the slope stability of the dump at 6 h,12 h,18 h during rainfall infiltration and 6 h after rainfall.The results show that the most dangerous sliding surface of the spoil ground tends to move down due to the rainfall infiltration.With the rainfall discharge intensity reaches the boundary condition,the safety factor of the spoil ground slope decreases by4.7%to 10%.When the constant water head is the boundary condition,the stability safety factor of the spoil ground decreases the fastest,which is 19%;In addition,after the end of rainfall,the slope stability of the spoil ground still has a small decline,that is,the most unstable moment shows a certain lag.At the same time,it is considered that besides seepage,there are also reasons for the change of soil structure after the loss of fine particles.
作者
刘浩
LIU Hao(Shanghai Survey and Design Institute<Group>Co.,Ltd,Shanghai 200093,China)
出处
《西部探矿工程》
CAS
2020年第6期1-4,共4页
West-China Exploration Engineering
关键词
弃土场
降雨入渗作用
边坡稳定性
spoil ground
rainfall infiltration
slope stability
作者简介
刘浩(1988-),男(汉族),江苏盐城人,工程师、注册土木(岩土)工程师,现从事岩土工程勘察以及地质灾害危险性评估工作。
