越流系统中弱透水层的一维固结解及分析

摘要

Aiming at the consolidation problem of aquitard in leakage system,one-dimensional consolidation control equation expressed by water head under arbitrary datum plane was derived,and one-dimensional consolidation model for aquitard in leakage system was established.The analytical solutions for amount of compression and average degree of consolidation were obtained.Furthermore,the essence of consolidation deformation of aquitard induced by leakage was analyzed,and an enquiry form for both calculating examples and average degree of consolidation was given.The results show that the fundamental reason for the deformation of soil layer is the increase in effective stress caused by seepage force.Under the water head difference of 1 m,the compression amount generated in aquitard is equal to total compression amount induced by uniformly distributed load of 5 kPa on the top surface of aquitard.Compared with the classical Terzaghi one-dimensional consolidation theory,one-dimensional consolidation of aquitard in leakage system achieves the same average degree of consolidation,and the required time for one-dimensional consolidation of aquitard is only a quarter of that for Terzaghi one-dimensional consolidation.%针对越流系统中弱透水层的固结问题,推导了任意基准面下以水头表示的一维固结控制方程,建立了越流系统中弱透水层的一维固结模型,给出了压缩量和平均固结度的解析解,分析了越流引发弱透水层固结变形的本质,并给出了计算实例和平均固结度的查询表格.研究结果表明：渗透力引起有效应力的增加是土层发生变形的根本原因;弱透水层在1 m越流水头差作用下,能够产生相当于弱透水层顶面施加5 kPa均布荷载所引起的总压缩量;越流系统中弱透水层的一维固结与经典的太沙基一维固结理论相比,达到了相同的固结度,但前者所需时间仅为后者的1/4.