渗流条件下弃渣场边坡的稳定性分析

摘要

弃渣场作为隧道工程的重要附属建筑,其稳定性意义重大.以某新近堆积弃渣场为研究对象,在工程地质调研、室内外试验的基础上,采用非饱和渗流研究方法,基于GeoStudio软件中的SEEP/W和SLOPE/W模块对其渗流场及不同工况下的稳定性进行分析.结果表明:降雨条件下弃渣内部土体孔压的变化较表层土体存在滞后效应,雨后一段时间内坡体内水分还在继续下渗;边坡的稳定系数在降雨停止时也并非最低,雨后边坡稳定系数由于坡体内雨水的下渗还会继续下降,一段时间之后才开始逐渐增加,与渗流场的计算结果相对应.%The stability of abandoned dreg site as an important adjunctive building of tunnel engineering,is of great significance.A recently used accumulative site of abandon dreg was taken as research object.Based on investigation of engineering geology and indoor-outdoor test,and using the investigation method of unsaturated seepage flow and SEEP/W and SLOPE / W modules in GeoStudio software,the stability of the slops was analyzed under different working conditions.The result shows that there will be a lagging effect of variation of pore water pressure within inner soil of abandoned dreg and its surface soil under the condition of rainfall,and the water in the slope will keep filtering down awhile after rainfall.The stability coefficient of the slope will be not the lowest one when the rainfall stops and it will keep decreasing gradually after rainfall because of the further decrease of the filtering down of the rainwater in the slope,awhile after only it will start to increase gradually and will correspond to the calculation result of the seepage flow field.