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膨胀性充填裂隙本构关系实验研究

Experimental research on constitutive relation of filled fracture with expansive medium

中文摘要英文摘要

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,膨胀性充填裂隙在峰值前表现为理想塑性阶段和线弹性阶段。实验开始时,充填裂隙即进入理想塑性流动状态,也就是说,应力基本保持不变,而应变持续增加,随着有限变形的进行及法向应力的增加,充填裂隙整体强度增大,表现出线弹性特征。根据实验数据和特征,提出了倒圣维南体力学模型,建立了膨胀性充填裂隙本构方程,并分析了其内在作用机理。

aking 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 relation of filled fracture with expansive medium is discussed on the condition of different fracture width and different water content. A large number of stress-strain data are obtained. It is showed that the early peak of filled fracture with expansive medium can be divided into two stages: the perfect plastic phase and the linear elastic stage. At the beginning of the experiment, the filled fracture is in the perfect plastic flow state, that is to say, the stress nearly remains unchanged, but the strain continues to increase. With the increase of finite deformation and normal stress, the overall strength of filled fractures increase,and show linear elastic characters. Based on the results, the mechanical model of inverted Saint-Venant body is put forward,constitutive equation of filled fracture with expansive medium is established, and its mechanism is analyzed.

陈金刚

水工材料

膨胀性介质充填裂隙本构关系单轴压缩倒圣维南体

expansive mediafilled fractureconstitutive relationuniaxial compressioninverted Saint-Venant body

陈金刚.膨胀性充填裂隙本构关系实验研究[EB/OL].(2010-09-06)[2025-08-18].http://www.paper.edu.cn/releasepaper/content/201009-113.点此复制

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