水文地质工程地质2016，Vol.43Issue(3)：101-105,5.DOI:10.16030/j.cnki.issn.1000-3665.2016.03.16
承压含水层顶板固结排水规律研究
A study of consolidation and drainage of clay soil layer on top of the confined aquifer
摘要
Abstract
Consolidation and drainage tests under different external pressures are carried out for undisturbed saturated clay of a confined aquifer.The variation in soil volume compressed and water volume discharged under the external pressure is analyzed.The relationship between the coefficient of expansion of soil volume and external pressure and the variation in permeability of soil in the process of consolidation are examined.The results show that when the external pressure is greater than the shear strength of the weakly bound water in soil,part of the weakly bound water will join the pore water seepage flow and convert to free water and drain out.Therefore,the water volume discharged is bigger than the soil volume compressed during soil consolidation,that is,when the deep saturated clay is compressed and compacted,the expansion effect of soil volume will take place.The relationship between the coefficient of expansion and the external pressure follows a power function.The coefficient of permeability of soil decreases with the increasing external pressure.The relationship between the coefficient of permeability and the external pressure follows an exponential function.Due to the drainage of the weakly bound water,stabilization of soil permeability will generate a time-lag effect.关键词
饱和黏性土/结合水/渗透系数/膨胀系数/阜阳地区Key words
saturated clay/bound water/permeability/coefficient of expansion/Fuyang region分类
土木建筑引用本文复制引用
姚梅,曹彭强,陶月赞,刘佩贵..承压含水层顶板固结排水规律研究[J].水文地质工程地质,2016,43(3):101-105,5.基金项目
国家自然科学基金项目资助(51309071) （51309071）
