摘要
以指数函数描述电渗过程中有效电压随时间衰减,建立考虑水平向和竖向的二维真空预压联合电渗排水固结理论,推导超静孔隙水压力的解析解,给出平均固结度的计算公式,并采用数值解进行对比验证。在此基础上,设真空度随地基深度线性减小,分析有效电压衰减速率、残余有效电压及真空度衰减率对地基固结性状的影响。研究表明:电压衰减越慢或残余有效电压越大,地基中的孔压消散越快,最终加固效果越好,但固结速度反而越慢,其中有效电压衰减速率对固结度的影响大于残余有效电压;真空度沿深度的衰减率越大,孔压消散越慢,形成的负超静孔压最大值越小,但对固结度几乎没有影响。
In this paper,a two-dimensional consolidation theory for soft foundation under vacuum preloading combined with electro-osmosis was established,which considers the exponential reduction of the effective voltage with time.Then,an analytical solution for excess pore water pressure was derived,and the calculation formula for average degree of consolidation was given.The accuracy of the proposed analytical solution was evaluated by validating it against numerical solution.Assuming that the vacuum degree is linear decrease along the depth,the influences of the reduction of the effective voltage and the decreasing of the vacuum degree to the consolidation behaviour were analyzed.The results show that the slower the reduction of the effective voltage is,or the larger the residual effective voltage is,the faster the dissipation of the excess pore water pressure and the larger the value of the negative excess pore water pressure in the foundation are,but the slower the consolidation is.Besides,the larger the reduction of the vacuum degree along the vertical drain depth is,the slower the dissipation of the excess pore water pressure and the smaller the value of the maximal negative excess pore water pressure in the foundation are.However,the influence of the reduction of the vacuum degree on the consolidation degrees is little.
作者
王柳江
王耀明
刘斯宏
袁静
WANG Liujiang;WANG Yaoming;LIU Sihong;YUAN Jing(College of Water Conservancy and Hydropower,Hohai University,Nanjing,Jiangsu 210098,China;Bureau of Water Affairs of Jiangning District,Nanjing,Jiangsu 211112,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2019年第A01期3134-3141,共8页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金青年基金项目(51509077)
中央高校基本科研业务费(2016B03514)~~
关键词
土力学
真空预压联合电渗
固结
解析解
有效电压衰减
参数分析
soil mechanics
vacuum preloading combined with electro-osmosis
consolidation
analytical solution
reduction of effective voltage
parametric study
