粘性土多孔抽水试验渗透性研究
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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 important guiding significance for dewatering and drainage of channel excavation.
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 important guiding significance for dewatering and drainage of channel excavation.
引文
[1]杨利超,王旭升,焦赳赳,等.粘性土层井孔抽水试验的参数识别[J].工程勘察,2011(6):32-35.
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[3]鞠晓明,何江涛,王俊杰,等.抽水试验与微水试验在确定水文地质参数中的对比分析[J].工程勘察,2011(1):51-56,63.
[4]宋厚园,彭振斌.抽水试验在长沙某地铁车站勘察中的应用[J].山西建筑,2011,37(34):57-58.
[5]王烈,李开超.稳定流抽水试验渗透系数的对比分析[J].地下水2012,34(2):40-41.
[6]丁金粟.土力学与基础工程[M].北京:地震出版社,1992.
[7]SL320—2005,水利水电工程钻孔抽水试验规程[S].
[8]GB50027—2001,供水水文地质勘察规范[S].
[9]陈崇希,林敏.地下水动力学[M].武汉:中国地质大学出版社,1999.
[10]薛禹群.地下水动力学[M].北京:地质出版社,1997.
[2]叶正强,李爱群,杨国华,等.粘性土的渗透规律性研究[J].东南大学学报,1999,29(5):121-125.
[3]鞠晓明,何江涛,王俊杰,等.抽水试验与微水试验在确定水文地质参数中的对比分析[J].工程勘察,2011(1):51-56,63.
[4]宋厚园,彭振斌.抽水试验在长沙某地铁车站勘察中的应用[J].山西建筑,2011,37(34):57-58.
[5]王烈,李开超.稳定流抽水试验渗透系数的对比分析[J].地下水2012,34(2):40-41.
[6]丁金粟.土力学与基础工程[M].北京:地震出版社,1992.
[7]SL320—2005,水利水电工程钻孔抽水试验规程[S].
[8]GB50027—2001,供水水文地质勘察规范[S].
[9]陈崇希,林敏.地下水动力学[M].武汉:中国地质大学出版社,1999.
[10]薛禹群.地下水动力学[M].北京:地质出版社,1997.