动荷载作用下辽西冻风积土的损伤演化分析

›› 2006, Vol. 27 ›› Issue (S2): 739-742.

动荷载作用下辽西冻风积土的损伤演化分析

张树光¹，孙杨² ，张向东¹

1. 辽宁工程技术大学土木建筑工程学院，辽宁阜新 123000 2. 辽宁工程技术大学，科瑞特公司辽宁阜新 123000

收稿日期:2006-07-20 发布日期:2006-12-16
作者简介:张树光，男，1974年生，副教授。主要从事环境岩土工程方面的研究。
基金资助:
国家自然科学基金（50478033）和辽宁省教育厅科研基金（2004D120）资助项目。

Damage Evolution Analysis of Frozen Aeolian Soil in the West of Liaoning Province Under Dynamic Loading

ZHANG Shu-guang, SUN Yang, ZHANG Xiang-dong

Liaoning Technical University, Fuxin 123000, China

Received:2006-07-20 Published:2006-12-16

摘要/Abstract

摘要： 为了研究辽西冻风积土在动荷载作用下的损伤演化规律，采用动三轴仪进行了室内试验，获得了动本构关系、损伤演化方程以及损伤变量随应变的演化曲线。同时，针对冻风积土损伤的初始阶段，利用扫描电镜观测了微观结构。研究结果表明，冻风积土的损伤演化过程可以采用3个阶段进行描述。损伤的扩展速度在塑性损伤阶段发展较快，并且损伤变量的增长过程具备非线性特征；在微裂纹扩展阶段相对平缓，损伤变量与应变呈近似的线性增长关系。内部微裂纹的产生起于试样的中部，然后由中部向两端呈环状扩展。经过裂纹的交错和汇聚，斜向裂纹逐步形成和扩展。

关键词: 冻土, 损伤演化, 本构关系, 动力学, 微观结构

Abstract: Laboratory test has been done by using the dynamic triaxial test machine in order to study the damage evolution of frozen aeolian soil in the west of Liaoning Province under dynamic loading. The constitutive relation and damage evolution formula of frozen soil are established, and the dynamic evolution curve between damage variable and strain is sketched. At the same time, pertaining to the at initial stage of damage of frozen aeolian soil, the microstructure is observed by using the scanning electronic microscope (SEM). The results show that the process of damage of frozen aeolian soil can be divided into three stages. In plastic damage stage, the speed of damage growth is fast, and the increase of damage variable is non-linear. In micro-crack damage stage, the damage growth is relatively flat and smooth, and the relation between damage variable and strain is approximately linear. The interior micro-cracks appear in the middle of sample. From the middle to the ends of in the sample, the micro-cracks are in the from of circular growth. Through transfixion and collection of cracks, the inclined cracks come into being and enlarge step by step.

中图分类号:

P642.14

张树光，孙杨，张向东，. 动荷载作用下辽西冻风积土的损伤演化分析[J]. , 2006, 27(S2): 739-742.

ZHANG Shu-guang, SUN Yang, ZHANG Xiang-dong. Damage Evolution Analysis of Frozen Aeolian Soil in the West of Liaoning Province Under Dynamic Loading [J]. , 2006, 27(S2): 739-742.

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