重塑饱和黄土长期渗流劣化机制及其渗透性分析

›› 2013, Vol. 34 ›› Issue (7): 1965-1971.

重塑饱和黄土长期渗流劣化机制及其渗透性分析

安鹏^{1, 2}，张爱军¹，刘宏泰¹，王婷¹

1. 西北农林科技大学水利与建筑工程学院，陕西杨凌 712100；2. 中国水利水电科学研究院，北京 100048

收稿日期:2012-07-13 出版日期:2013-07-10 发布日期:2013-07-15
通讯作者: 张爱军，男，1964年生，博士，教授，从事黄土工程理论与计算研究。E-mail: Zaj@nwsuaf.edu.cn E-mail:anpeng110@163.com
作者简介:安鹏，男，1985年生，硕士，从事黄土工程理论与计算研究
基金资助:
国家自然科学基金项目(No. 51279171)；“十二五”国家科技支撑项目(No. 2011BAD25B04)

Degradation mechanism of long-term seepage and permeability analysis of remolded saturated loess

AN Peng^{1, 2}，ZHANG Ai-jun¹，LIU Hong-tai¹，WANG Ting¹

1. College of Water Resources and Architectural Engineering, Northwest A & F University, Yangling, Shaanxi 712100, China; 2. China Institute of Water Resources and Hydropower Research, Beijing 100048, China

Received:2012-07-13 Online:2013-07-10 Published:2013-07-15

摘要/Abstract

摘要： 为研究重塑饱和黄土在长期渗流条件下的劣化机制，以杨凌Q3黄土为研究对象，用pH=4的稀乙酸溶液作为渗透液加速劣化，通过长时间的常规渗透试验和不同围压下的三轴渗透试验，测量了渗透系数随时间的变化过程，分析了渗透系数随时间的变化规律，探讨了重塑饱和黄土在长期渗流条件下的劣化机制。结果表明：渗透系数随着渗透时间持续减小，与时间符合幂函数关系；渗透系数是反映黄土劣化最敏感的参数；最小孔隙比面的孔隙比决定了渗透系数的大小；最小孔隙比面的孔隙比与初始孔隙比的比值可以用来描述黄土长期渗流的劣化程度，其比值定义为黄土长期渗流劣化率；结合黄土的非线性渗透模型提出了在一定围压下三轴渗透试验渗透系数与黄土长期渗流劣化率的关系式，进而推导出黄土长期渗流劣化率随时间的变化关系式。

关键词: 重塑饱和黄土, 渗透试验, 渗透性, 黄土长期渗流劣化率

Abstract: In order to study the degradation mechanism of the remolded saturated loess under long-term seepage, dilute acetic acid of pH=4 was used as percolation fluid so as to accelerate the deterioration. After a series of long-term conventional percolation tests and triaxial percolation tests under different confining pressures were conducted using Yangling Q3 loess as samples, the permeability coefficient was measured; and the relation between the permeability coefficient and time was analyzed; then the degradation mechanism of the remolded saturated loess under long-term seepage was studied. The results show that the permeability coefficient decreases with time; and the relationship between permeability coefficient and time meets power function. The permeability coefficient is the most sensitive parameter reflecting the degradation degree of the loess, which is determined by void ratio in the minimum void ratio surface. Loess seepage rate of deterioration is defined by the ratio of void ratio in the minimum void ratio surface and initial void ratio, to describe the degradation degree of the remolded saturated loess in long-term seepage. At last, the relationship between loess seepage rate of deterioration and permeability coefficient is proposed based on the nonlinear permeability model of loess, as well as the relationship between loess seepage rate of deterioration and the percolation time is derived.

Key words: remolded saturated loess, percolation test, permeability, deterioration rate of long-term loess seepage

中图分类号:

TU 444

安鹏，张爱军，刘宏泰，王婷 . 重塑饱和黄土长期渗流劣化机制及其渗透性分析[J]. , 2013, 34(7): 1965-1971.

AN Peng ，ZHANG Ai-jun　，LIU Hong-tai　，WANG Ting　. Degradation mechanism of long-term seepage and permeability analysis of remolded saturated loess[J]. , 2013, 34(7): 1965-1971.

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