渗流条件下弃渣场边坡的稳定性分析
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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.
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.
引文
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[2]刘建伟,史东梅,马晓刚,等.弃渣场边坡稳定性特征分析[J].水土保持学报,2007,21(5):192-195.
[3]顾育国.溪洛渡坝区杨家沟渣场稳定性分析与侵蚀研究[D].成都:西南交通大学,2010.
[4]刘浩,张家铭,付金丹,等.弃渣场滑坡影响因素敏感性计算分析[J].安全与环境工程,2012(6):55-58.
[5]罗雷,何丙辉,王锐亮.弃渣场堆渣及挡渣墙稳定性分析[J].水土保持研究,2006,13(2):253-256.
[6]肖志红.不同粒径渣体对弃渣场稳定性影响研究[J].人民长江,2014,45(12):38-42.
[7]张家铭,付金丹,刘浩.基于改进正交设计的山区弃土场边坡稳定性敏感分析[J].科技导报,2012,30(17):38-42.
[8]中华人民共和国交通部.公路土工试验规程:JTG E40—2007[S].北京:人民交通出版社,2007.
[9]常士骠.工程地质手册[M].北京:中国建筑工业出版社,1992.
[10]温辉波.库岸松散堆积体抗剪强度试验研究[D].重庆:重庆交通大学,2012.
[11]中华人民共和国住房和城乡建设部.建筑边坡工程技术规范:GB 50330—2013[S].北京:中国建筑工业出版社,2013.