摘要
从固结系数的定义出发,将压缩系数视为变量,建立了渗透系数与固结应力的微分方程,求得了软土正常固结状态时,考虑前期固结压力的渗透系数随固结应力变化关系表达式。利用室内试验数据,将提出的公式与现有渗透系数与固结应力关系式、试验结果进行对比。研究表明,所提出的公式能较好地反映渗透系数随固结应力变化的特点,比未考虑前期固结压力的计算式更接近于实际情况,从而为实际工程中预估固结变形速率提供了一种较为准确的方法。
Considering the compressibility coefficient as a variable, a differential equation about the permeability coefficient and consolidation stress is established based on the definition of consolidation coefficient, thus an expression of the relationship between permeability coefficient and consolidation stress involved with previous consolidation pressure is deduced for normal consolidated soft clay. Using experimental data, the presented expression is compared with the existing solutions and the test results. The research shows that the proposed expression can well reflect the characteristics of permeability coefficient with the variation of consolidation stress and is more approximate to the practice than those solutions without considering previous consolidation pressure. It will provide a more accurate method when predicting the rate of consolidated deformation in engineering practice.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2009年第3期769-773,共5页
Rock and Soil Mechanics
基金
国家自然科学基金(No.50679014)
博士后科研基金(No.20060390987)资助项目
关键词
压缩系数
渗透系数
固结应力
固结系数
正常固结
compressibility coefficient
permeability coefficient
consolidation stress
consolidation coefficient
normal consolidation
