膨胀性充填裂隙峰前本构关系实验研究

›› 2011, Vol. 32 ›› Issue (10): 2998-3003.

膨胀性充填裂隙峰前本构关系实验研究

陈金刚¹，徐平²，张 ³，李亚帮¹

1.郑州大学工程力学系，郑州 450001；2.郑州大学水利与环境学院，郑州 450001；3.郑州大学土木工程学院，郑州 450001

收稿日期:2010-06-22 出版日期:2011-10-10 发布日期:2011-10-13
作者简介:陈金刚，男，1973年生，博士，副教授，硕士生导师，主要从事充填裂隙水力特性研究
基金资助:
国家自然科学基金资助项目（No. 50709030，No. 51008286）；郑州大学国家大学生创新性实验资助项目（No. 091045927）

Experimental research on pre-peak constitutive relation of filled fracture with expansive medium

CHEN Jin-gang¹, XU Ping², ZHANG Yan³, LI Ya-bang¹

1. Department of Engineering Mechanics, Zhengzhou University, Zhengzhou 450001, China; 2. School of Water Conservancy and Environment, Zhengzhou University, Zhengzhou 450001, China; 3. School of Civil Engineering , Zhengzhou University, Zhengzhou, 450001, China

Received:2010-06-22 Online:2011-10-10 Published:2011-10-13

摘要/Abstract

摘要： 以钠基膨润土为充填介质，水泥砂浆为裂隙壁制作充填裂隙，采用法向压缩、侧向约束的方式，对不同宽度和不同含水率条件下膨胀性充填裂隙的本构关系进行了探讨，获得了大量应力、应变实验数据。研究表明，膨胀性充填裂隙峰前本构关系可划分为3个阶段：流变阶段、压密阶段和弹性阶段。实验开始时，充填裂隙即进入流变状态，也就是说应力基本保持不变，而应变持续增加，随着有限变形及法向应力的增加，充填裂隙整体强度增大，逐渐表现出弹性特征。根据实验数据和特征，提出倒圣维南体(inverted Saint-Venant body)力学模型，建立了膨胀性充填裂隙本构方程，并分析了其内在作用机制

关键词: 膨胀性介质, 充填裂隙, 本构关系, 单轴压缩, 倒圣维南体

Abstract: Taking Na-bentonite as filling medium and cement mortar as fissure wall, the filled fractures are made. By means of normal compression and lateral restraint, the constitutive relations of filled fracture with expansive medium and under the conditions of different fracture widths and different water contents, are discussed. A large number of stress-strain data are obtained. It is shown that the fractures filled with expansive medium can be divided into three stages: rheological phase, compression phase and the elastic stage in the pre-peak. At the beginning of the experiment, the filled fracture is in the rheological state; that is to say, the stress nearly remains unchanged, but the strain continues to increase. With the finite deformation and the normal stress increase, the filled fracture overall intensity increase, and demonstrate elastic characteristics gradually. Based on the results, the mechanical model of inverted Saint-Venant body is put forward; pre-peak constitutive equation of filled fracture with expansive medium is established; and its mechanism is analyzed.

Key words: expansive media, filled fracture, constitutive relation, uniaxial compression, inverted Saint-Venant body

中图分类号:

TU 458.3

陈金刚，徐平，张  ，李亚帮. 膨胀性充填裂隙峰前本构关系实验研究[J]. , 2011, 32(10): 2998-3003.

CHEN Jin-gang , XU Ping , ZHANG Yan , LI Ya-bang. Experimental research on pre-peak constitutive relation of filled fracture with expansive medium[J]. , 2011, 32(10): 2998-3003.

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