水位变化条件下粘性土渗流特征试验研究  

Experiments on osmosis through clayey soil under the condition of variable water levels

作　　者：曹文炳[1] 万力[1] 龚斌[1] 王大纯[1] 

机构地区：[1]中国地质大学(北京)水资源环境学院,北京100083

出　　处：《水文地质工程地质》2006年第2期118-122,共5页Hydrogeology & Engineering Geology

摘　　要：开采孔隙承压含水系统,引起含水层水头下降。通常认为相邻含水层一经出现水头差,便会有通过粘性土层的越流渗透。但在粘性土两侧含水层出现水头差初期,粘性土内部水头降低缓慢,并伴随有释水压密过程。本文采用多用途饱水粘性土固结和渗透试验装置,对不同岩性的粘性土原状样进行了释水、吸水与越流发展过程之间关系的试验。试验表明,含水层水位升、降变化,首先引起相邻粘性土吸水回弹或释水压密,而后出现粘性土吸水或与释水越流并存阶段,越流的出现,明显滞后于含水层水头变化,当吸水或释水过程结束后,越流渗透达到稳定。越流滞后时间与土的固结程度有关,笔者采用一维固结理论提出了计算越流滞后时间的方法。When groundwater is pumped from a confined aquifer consisting of unconsolidated sediments, the water level in the confined aquifer will fall. A process of seepage is generally observed in the clayey layer. At the same times, there is a hydraulic gradient between two adjacent aquifers. At the beginning of a period of time when hydraulic gradient appears, water level in the clayey layer falls slowly and draining and compaction of the layer also occur. The authors conducted an experiment with clay of various original states by employing a clayey multiby adopting one-dimension concretion theory.

关 键 词：粘性土释水 越流发展过程 越流滞后时间 

分 类 号：P641.12[天文地球—地质矿产勘探] P631.621[天文地球—地质学]