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Development and verification of a micromechanics-based continuum theory for long-term deterioration of hard rock

基于微观力学的硬岩长期劣化连续体理论的开发和验证

基本信息

批准号：
16560408
负责人：
OKUI Yoshiaki
金额：
$ 2.43万
依托单位：
Saitama University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16560408/
关键词：
hard rock creep stress corrosion cracking micromechanics fabric tensor elastic wave velocity long-tem deterioration

项目摘要

The purpose of this study is to establish a micromechanics-based continuum damage model to analyze short- and long-term behavior of brittle rocks under compression. The model developed in this study provides information on not only the macroscopic mechanical responses of rock such as strength, but also microscopic information such as crack lengths and crack density during inelastic deformation. A small number of parameters are involved in this model and can be identified from the results of triaxial compression tests, creep tests and microscopic observation of microcracks. The model is derived from the mechanics of tensile microcracks. It is assumed that local tensile stress thereby sliding up on asperities causes microcracks growth. By generalizing the analysis of one single microcrack and also, including the effects of interaction among neighboring microcracks directly on cracks growth, the proposed model for brittle rocks under compression is derived.In order to illustrate the predi … More ctive capability of the proposed model, the model is applied to simulation of short-term mechanical tests of Inada granite. Numerical results are compared with experimental data from triaxial compression tests results and microscopic observations of microcracks. The peak stress obtained numerically is in good accordance with the one observed in triaxial compression tests under a confining pressure higher than 10 MPa.Furthermore, the present model is capable of reproducing the three characteristic stages of long-term behavior commonly observed in laboratory creep tests. The sub-critical microcrack growth parameters can be determined for Inada granite by fitting the numerical results of elapse time to failure versus the creep stress ratio curve with the experimental data under both dry and wet conditions. Use of the extended model makes it possible to analyze not only the extension of microcrack length, but also the development of the excavation damage zone around tunnels as a function of time. Less

本研究旨在建立一个基于细观力学的连续损伤模型来分析脆性岩石在压缩作用下的短期和长期行为。在这项研究中开发的模型提供的信息不仅宏观力学响应的岩石，如强度，但也微观信息，如裂纹长度和裂纹密度在非弹性变形。该模型涉及的参数较少，可以通过三轴压缩试验、蠕变试验和微裂纹的微观观察来确定。该模型来自拉伸微裂纹力学。据推测，局部拉应力，从而滑动上的凹凸导致微裂纹生长。通过对单个微裂纹分析的推广，并考虑到相邻微裂纹间的相互作用对裂纹扩展的直接影响，导出了脆性岩石压缩裂纹扩展模型，为了说明该模型的预测结果， ...更多信息通过对稻田花岗岩短期力学试验的模拟，验证了该模型的有效性。将数值计算结果与三轴压缩试验结果和微观裂纹观测结果进行了比较。数值模拟得到的峰值应力与围压高于10 MPa的三轴压缩试验中观察到的峰值应力吻合较好，而且本模型能够再现实验室蠕变试验中常见的三个特征阶段。通过拟合干、湿两种条件下的蠕变应力比曲线与破坏时间的数值计算结果，确定了稻田花岗岩亚临界微裂纹扩展参数。扩展模型的使用不仅可以分析微裂纹长度的扩展，而且可以分析隧道周围开挖损伤区随时间的发展。少

项目成果

期刊论文数量（12）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

A micromechanical model for brittle failure of rock and its relation to crack growth observed in triaxial compression tests of granite

DOI：
10.1016/j.mechmat.2005.07.003
发表时间：
2006-04
期刊：
Mechanics of Materials
影响因子：
3.9
作者：
A. Golshani;Y. Okui;M. Oda;T. Takemura
通讯作者：
A. Golshani;Y. Okui;M. Oda;T. Takemura

A micromechanical model for brittle failure of rock and its relation to crack growth observed in trixial compression tests of granite

岩石脆性破坏的微观力学模型及其与花岗岩三向压缩试验中观察到的裂纹扩展的关系

DOI：
发表时间：
2006
期刊：
Mechanics of Materials 38
影响因子：
0
作者：
Golshani;A.;Okui;Y.;Oda;M.;Takemura;T.
通讯作者：
T.

Hydraulic behaviour of Inada granite in the excavation disturbed zone around underground openings

地下洞室开挖扰动区稻田花岗岩的水力行为

DOI：
发表时间：
2005
期刊：
The Seventh International Summer Symposium, JSCE, 30 July 2005 Tokyo, Japan
影响因子：
0
作者：
Golshani;A.;Okui;Y.;Oda;M.;Takemura;T.
通讯作者：
T.

Time-dependent continuous damage model for brittle failure of rocks

岩石脆性破坏的时变连续损伤模型

DOI：
发表时间：
2004
期刊：
53rd Geomechanics Colloquy and EUROCK 2004, 7-9 October, 2004, Salzburg, Austria
影响因子：
0
作者：
Golshani;A.;Okui;Y.;Takemura;T.;Oda;M.
通讯作者：
M.

Simulation of damage around a circular opening in rock

岩石中圆形开口周围损伤的模拟