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.
出处
《水文地质工程地质》
CAS
CSCD
北大核心
2006年第2期118-122,共5页
Hydrogeology & Engineering Geology
关键词
粘性土释水
越流发展过程
越流滞后时间
draining process in clay
the development process of seepage
hysteresis time of seepage
