线性加载下考虑土体非线性变形的一维固结理论  

1-D consolidation method for saturated soft clay with linear loading and hyperbola model

作　　者：赵明华[1] 孙琮涵 张玲[1] 刘猛[1] 

机构地区：[1]湖南大学岩土工程研究所,湖南长沙410082

出　　处：《水文地质工程地质》2015年第4期35-42,共8页Hydrogeology & Engineering Geology

基　　金：国家自然科学基金项目(51478178)

摘　　要：深厚软黏土一维固结计算中,初始应力和附加应力分布形式对固结度存在较大影响。假设土体初始应力和附加应力均沿深度线性变化,推导了线性加载时的双曲线一维固结控制方程,并用差分法加以解答。同时,在不同的外荷载qa、压缩层厚度H、初始模量E0、附加应力分布系数β及边界条件下,分析了初始应力和附加应力沿深度线性变化对平均固结度Us、Up的影响。结果表明,当顶面和底面均透水时,除了E0≤388 k Pa且H≥25 m情况外,初始应力和附加应力沿深度线性变化对Us、Up的影响不大。但当顶面透水而底面不透水时,在土体初始应力和附加应力的两种不同分布形式下计算的Us、Up相差较大,特别是对于深厚软黏土,这种差别更加明显。另外,还可以看出,考虑初始应力和附加应力随深度变化时,Tv不再适合作为描述时间的无量纲因子。The distribution of initial stress and additional stress cannot be ignored when calculating the degree of consolidation,especially for thick soft clay. Assuming that initial stress and additional stress increase with the depth,a new 1-D consolidation governing equation is derived,which is based on hyperbola model and linear load. Finite differential method is applied for solving the equation. In addition,the influence of the improvement is analyzed with different qa,H,β,beta and boundary conditions. The results show that the improvement makes no difference except for E0≤388 k Pa and H≥25 m with permeable top and impermeable bottom. Thus, it does make a big difference when the top is permeable and bottom is impermeable.Furthermore,Tvis no more suitable when considering the initial stress and additional stress changes with the depth.

关 键 词：软黏土 线性加载 双曲线模型 一维固结 

分 类 号：TU441[建筑科学—岩土工程]