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

CHEN Jin-gang; XU Ping; ZHANG Yan; LI Ya-bang

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

更新时间：2026-06-25

- Experimental research on pre-peak constitutive relation of filled fracture with expansive medium
- Vol. 32, Issue 10, (2011)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU458.3
- Online First：13 October 2011，
  
  Published：2011
- 稿件说明：
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CHEN Jin-gang, XU Ping, ZHANG Yan, et al. Experimental research on pre-peak constitutive relation of filled fracture with expansive medium[J]. 2011, 32(10).
DOI：

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

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

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.

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