| 考虑幂函数渗透压缩变化的双层砂井地基固结性状 |
| |
| 引用本文： | 张 明,王 威,刘起霞,赵有明.考虑幂函数渗透压缩变化的双层砂井地基固结性状[J].岩土力学,2013,34(11):3117-3126. |
| |
| 作者姓名： | 张 明 王 威 刘起霞 赵有明 |
| |
| 作者单位： | 1. 河南工程学院 土木工程学院，郑州 451191；2. 中国铁道科学研究院，北京 100081； 3. 北京工业大学 抗震减灾研究所，北京 100124；4. 河南工业大学 土木建筑学院，郑州 450001 |
| |
| 基金项目： | 国家自然科学基金项目(No. 51208017)；河南工程学院博士基金项目(No. D2012007)。 |
| |
| 摘 要： | 采用Barron轴对称固结及大变形固结问题的某些简化与假定，推导建立了砂井地基大变形固结控制方程，利用建立的双层砂井地基大变形固结方程及编制的计算程序，通过引入软土渗透系数、有效应力与孔隙比之间的幂函数关系k =ced与e=a( )b，对瞬时加载下双层砂井地基固结性状进行算例计算。结果表明：（1）双层软土幂函数渗透关系及压缩关系中诸参数对双层砂井地基固结性状有重要影响：随着两层软土幂函数渗透关系中参数c1、c2的增加（渗透性增加）、或幂函数压缩关系中参数a1、a2的增加，各土层水平径向与竖向孔隙比减小更快，沉降发展速率与超静孔压消散速率也相应增加，且沉降发展速率快于孔压消散速率。（2）两层土在分界面处的孔隙比及平均超静孔压均出现明显的突变，将沿深度分布曲线分成形状不同的两段，表现出不同的固结性状。
|
| 关 键 词： | 土力学 大变形固结 双层砂井地基 软土 幂函数渗透关系 幂函数压缩关系 |
| 收稿时间： | 2013-06-18 |
Consolidation behaviors of double-layered vertical drains ground considering power function permeability and compressibility variation |
| |
| ZHANG Ming,WANG Wei,LIU Qi-xia,ZHAO You-ming.Consolidation behaviors of double-layered vertical drains ground considering power function permeability and compressibility variation[J].Rock and Soil Mechanics,2013,34(11):3117-3126. |
| |
| Authors: | ZHANG Ming WANG Wei LIU Qi-xia ZHAO You-ming |
| |
| Institution: | 1. College of Civil Engineering, Henan Institute of Engineering, Zhengzhou 451191, China; 2. China Academy of Railway Sciences, Beijing 100081, China; 3. Institute of Earthquake Resistance and Disaster Reduction, Beijing University of Technology, Beijng 100124, China; 4. College of Civil Engineering and Architecture, Henan University of Technology, Zhengzhou 450001, China |
| |
| Abstract: | Based on some simplification and assumption of one-dimensional finite-strain consolidation theory and Barron axisymmetric consolidation theory, a finite-strain consolidation governing equation for vertical drains ground is established. Based on the finite-strain consolidation equation for double-layered vertical drains in soft soil and the computing program in some literatures, the power function relationships of permeability coefficient-void ratio k=ced and effective stress-void ratio e=a( )b for soft soil are introduced; and some examples calculation of consolidation behaviors of double-layered vertical drains ground are carried out under instantaneous loading. The obtained results show that: (1) Some important influence on the consolidation behaviors of double-layered vertical drains ground of various parameters in power function permeability and compressibility relationships for double-layered soft clay soil are as follows. With the increase of parameters c1, c2 of power function permeability relationship (the increase of permeability), or parameters a1, a2 of power function compressibility relationship for soft soil, the void ratios in the radial and vertical directions decrease faster; and the dissipation velocity of excess pore water pressure and the settlement rate are also accelerated; the settlement development rate is faster than the dissipation velocity of excess pore water pressure. (2) The void ratio and average excess pore water pressure at the interface of double-layered soft soil present significant mutation, of which the distribution curve along the depth is divided into two sections with different consolidation behaviors. |
| |
| Keywords: | soil mechanics finite-strain consolidation double-layered vertical drains ground soft soil power function permeability relationship power function compressibility relationship |
|
| 点击此处可从《岩土力学》浏览原始摘要信息 |
| 点击此处可从《岩土力学》下载免费的PDF全文 |
