粘性土多孔抽水试验渗透性研究  

Study on Permeability of Cohesive Soil with Multiple Observation Wells Pumping Test

作　　者：姚阳[1] 郭卫新[1] 张党立[1] 娄国川[1] 

机构地区：[1]黄河勘测规划设计有限公司,河南郑州450003

出　　处：《资源环境与工程》2015年第5期677-680,共4页Resources Environment & Engineering

摘　　要：粘性土具有孔隙度大而透水性差的特点,属于弱透水层。目前粘性土的渗透系数主要通过室内土工试验获取,但土工试验结果容易受到取样扰动的影响,而且往往只能代表小尺度条件下的参数特征。为了获得适用于现场大尺度条件下的渗透系数,有必要进行现场抽水试验。以南水北调中线总干渠某段粘性土为例,采用多孔抽水试验计算粘性土的渗透系数,并与室内试验结果进行对比分析,探讨粘性土的渗透性,对渠道开挖降排水具有重要的指导意义。Cohesive soil is aquitard with large porosity and poor permeability characteristics .Currently, permeability of cohesive soil is mainly acquired through laboratory soil test , but the test results are susceptible to sampling disturbance and only represent the parameters characteristic of small scale conditions .To obtain field permeability coefficient under large-scale conditions ,it is necessary to carry out on-site pumping tests .Taking cohesive soil for instance in a section of middle route of South-to-North Water Diversion Project , the study of the permeability of cohesive soil is carried out through the comparative analysis between multiple-observation-wells pumping test and laboratory .The study has the im-portant guiding significance for dewatering and drainage of channel excavation .

关 键 词：粘性土 多孔抽水试验 渗透系数 降深 

分 类 号：TU442[建筑科学—岩土工程] TU441.33[建筑科学—土工工程]