摘要
弱透水层储存的地下水是地下水资源的重要组成部分,弱透水层水文地质参数对地下水资源管理与评价以及地面沉降等具有重要意义。通过室内试验对定降深条件下弱透水层水流运移规律进行了研究,并探讨了弱透水层释水过程中的变形规律和释水规律。试验结果表明,在相邻含水层定降深条件下,弱透水层固结变形滞后于相邻含水层的降深变化,且变形速度逐渐变小并趋于零。基于室内试验,利用配线法求得弱透水层不同应力状态下的水文地质参数,对比分析,大变形和小变形试验中土层的渗透系数变化不大,但贮水率明显变小,土层的固结系数变大。因此,土层的应力历史对土层的渗透系数影响不大,而对贮水率有较大的影响。
The water in aquitards is an important part of groundwater resources. It is of important significance to determine hydrogeological parameters of an aquitard for the management and evaluation of groundwater resources and for land subsidence. This paper examined the law of the water flow in the aquitard with laboratory test and discussed the law of depletion and deformation of the aquitard when water is released from the aquitard. The results show that the consolidation of the aquitard lags behind the drawdown change of the adjacent aquifer. The deformation rate of the aquitard becomes smaller and tends to zeros under the condition of a constant drawdown of the adjacent aquifer. Based on the results of the laboratory test,the hydrogeological parameters of the aquitard were calculated by using the type curve method under different stress histories. The results suggest that the coefficient of permeability changes little,the specific storativity changes greatly and the consolidation coefficient of the soil layer becomes larger in the large deformation and small deformation tests.The small deformation test is carried out on the basis of the large deformation test of the soil layer. The stress history of the soil layer has little effect on the coefficient of permeability of the soil layer,but has a greatinfluence on the specific storativity.
出处
《水文地质工程地质》
CAS
CSCD
北大核心
2017年第5期14-19,共6页
Hydrogeology & Engineering Geology
基金
国家自然科学基金项目(4170225
41572209
51709186)
中国博士后科学基金资助项目(2017M611863)
关键词
弱透水层
应力历史
滞后变形
水力参数
aquitard
stress history
delayed deformation
hydraulic parameters
