基础理论与实验研究

岩石裂纹闭合效应及其定量模型研究

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  • 1. 武汉大学 水资源与水电工程科学国家重点实验室,湖北 武汉 430072;2. 武汉大学 水工岩石力学教育部重点实验室,湖北 武汉 430072; 3. 南昌大学 建筑工程学院,江西 南昌 330031;4. 中船第九设计研究院工程有限公司,上海 200063
彭俊,男,1986年生,博士,讲师,主要从事岩石力学特性方面的研究工作。

收稿日期: 2014-05-16

  网络出版日期: 2018-06-09

基金资助

国家自然科学基金(No. 51579189);国家973项目(No. 2011CB013501);教育部新世纪优秀人才计划项目资助(No. NCET-11-0406)

A study of crack closure effect of rocks and its quantitative model

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  • 1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, Hubei 430072, China; 2. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education, Wuhan University, Wuhan, Hubei 430072, China; 3. School of Civil Engineering and Architecture, Nanchang University, Nanchang, Jiangxi 330031, China; 4. China Shipbuilding NDRI Engineering Co., Ltd., Shanghai 200063, China

Received date: 2014-05-16

  Online published: 2018-06-09

Supported by

This work was supported by the National Natural Science Foundation of China (51579189), the National Program on Key Basic Research Project of China (973 Program) (2011CB013501) and Program for New Century Excellent Talents in University of Ministry of Education of China (NCET-11-0406).

摘要

岩石的裂纹闭合效应对于岩石的变形以及强度性质具有重要影响。主要研究了岩石内部微裂纹的闭合压密效应及其定量评价方法。首先,基于有效介质理论将岩石的轴向应变分为基质轴向应变和裂纹轴向应变两部分;然后通过3组岩石压缩试验资料,建立裂纹轴向应变随轴向应力变化的负指数模型。分析发现,负指数模型可以较好地描述岩石裂纹闭合压密阶段的非线性。裂纹闭合应变可以在一定程度上反映岩石内部的微裂纹数量(密度),能够描述微裂纹密度在单轴、三轴压缩条件下的变化规律。

本文引用格式

彭 俊 ,荣 冠 ,周创兵 ,彭 坤, . 岩石裂纹闭合效应及其定量模型研究[J]. 岩土力学, 2016 , 37(1) : 126 -132 . DOI: 10.16285/j.rsm.2016.01.015

Abstract

The deformation and strength of rocks are significantly influenced by the crack closure behavior. In this study, the crack closure effect and its quantitative characterization are studied. First, based on the widely used effective medium theory, the axial strain is divided into the matrix axial strain and the crack axial strain. Three sets of test data are then used to establish a negative exponential model for the relationship between the crack axial strain and the axial stress. It is found that the crack closure behavior is well captured by the proposed model. The crack closure strain can be used to some extent to represent the microcrack quantity (or microcrack density) in the rock sample. The variation of the microcrack density under uniaxial and triaxial compressions is well described by using the crack closure strain.
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