应力影响下粉质黏土的等效渗透系数计算

doi:10.13722/j.cnki.jrme.2016.1086

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摘要

为了定量研究粉质黏土的渗透系数随所受应力而变的特征，通过三轴渗透试验，测量不同干密度的粉质黏土在不同有效应力水平下的渗透系数，分析渗透系数与干密度和应力的关系。结果表明：粉质黏土的饱和密度随着应力的增大而增大，在应力为400 kPa时增幅为5%～9%；渗透系数k受有效应力的影响较大，在应力为300 kPa时减小1～2个数量级；与和干密度线性相关显著。根据研究结果提出了考虑有效应力和干密度影响的粉质黏土渗透系数的表达式，并推导了粉质黏土层的纵向与横向等效渗透系数计算式及最具代表性土样的取样位置。

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	曹彭强
	虞邦义
	余金煌
	马飞跃

关键词 ：土力学, 粉质黏土, 渗透性, 三轴渗透试验

Abstract：

In order to quantitatively study the characteristic that the permeability coefficient of silty clay varies with the stress，the permeability coefficient of different dry density silty clay under different effective stress levels were measured by triaxial permeability test，and the relationship between permeability coefficient and dry density and stress were analysis. Results showed that the saturated density of silty clay increases with stress，and the increase amplitude were 5%–9% when the stress was 400 kPa. The permeability coefficient k was great effected by effective stress σ and decreased 1 to 2 orders of magnitudes when the stress was 300 kPa. The lnk presented a significant linear correlation withand. An expression for permeability coefficient of silty clay considering dry density and effective stress was proposed based on the results. And the equivalent vertical and horizontal permeability of silty clay layer calculation method and the most representative location of soil sample were derived.

Key words： soil mechanics silty clay permeability triaxial permeability test

引用本文:

曹彭强，虞邦义，余金煌，马飞跃. 应力影响下粉质黏土的等效渗透系数计算[J]. 岩石力学与工程学报, 2017, 36(S1): 3656-3662.
CAO Pengqiang，YU Bangyi，YU Jinhuang，MA Feiyue. Calculation method of equivalent permeability coefficient of silty clay under stress. , 2017, 36(S1): 3656-3662.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2016.1086 或 https://rockmech.whrsm.ac.cn/CN/Y2017/V36/IS1/3656

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