水压和应力耦合下脆性岩石蠕变与破坏时效机制研究

›› 2010, Vol. 31 ›› Issue (11): 3441-3446.

水压和应力耦合下脆性岩石蠕变与破坏时效机制研究

黄书岭^{1, 2}，冯夏庭¹，周辉¹，张传庆¹

1. 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室，武汉 430071； 2. 长江科学院水利部岩土力学与工程重点实验室，武汉 430010

收稿日期:2009-09-18 出版日期:2010-11-10 发布日期:2010-11-24
作者简介:黄书岭，男，1978年生，博士，工程师，主要从事岩石力学计算理论和岩土工程稳定性评价及控制理论等方面的研究。
基金资助:
国家自然科学基金（No. 10872209）；国家973项目（No. 2010CB732006）；中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室资助课题（No. Z110804）。

Study of aging failure mechanics and triaxial compression creep experiments with water pressure coupled stress of brittle rock

HUANG Shu-ling ^{1, 2}，FENG Xia-ting¹，ZHOU Hui¹，ZHANG Chuan-qing¹

1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Yangtze River Scientific Research Institute, Wuhan 430010, China

Received:2009-09-18 Online:2010-11-10 Published:2010-11-24

摘要/Abstract

摘要：

基于水压和应力耦合作用下锦屏深部大理岩的三轴蠕变试验，研究了大理岩的变形时效特性、等时曲线特征以及时效破坏机制。研究结果表明，(1) 孔隙水压可以增强大理岩的时效变形能力，有水压时的稳态蠕变率大于无水压状态时的稳态蠕变率。(2) 裂纹扩容失稳应力强度比可以作为硬脆性岩石是否发生失稳蠕变的门限值，且当应力强度比到达这一门限值时，岩石的失稳概率随着时间发展而陡增。(3) 体积蠕变量大于侧向和轴向的蠕变量值，显示脆性岩石扩容蠕变效应特征显著。(4) 不同时刻的等时曲线具有明显的相似性，在发生加速蠕变之前，等时曲线基本呈线性特征；而在发生加速蠕变时，等时曲线呈显著非线性特征。

关键词: 应力和水压耦合, 硬脆性岩石, 三轴蠕变试验, 变形破坏时效机制

Abstract:

Based on triaxial compression rheological experiments with water pressure coupled stress about the Jinping marble from the deep site in Jinping II diversion tunnel, the aging deformation characteristics，isochronous curve and aging failure mechanics are discussed in detail. The test results show that: (1) Water pressure can enhance the aging deformation capacity of the marble, and the steady-state creep rate under water pressure is greater than that when there is not water pressure. (2) Stress strength ratio of crack dilate instability can be used as creep instability threshold of brittle rock, and when stress strength ratio reached this threshold, the probability of rock instability increased sharply with time to develop. (3) Volume creep value is greater than the lateral or axial creep value, which indicates that there is a distinguishing dilate creep feature of brittle rock. (4) Isochronous curves of brittle rock at different time have obvious similarities, and accelerating creep ago, the curves are linear, but in the event of acceleration creep, the curves are significantly non-linear characteristics.

Key words: water pressure coupled stress, brittle rock, triaxial creep, aging deformation and failure mechanics

中图分类号:

TU 452

黄书岭，冯夏庭，周辉，张传庆. 水压和应力耦合下脆性岩石蠕变与破坏时效机制研究[J]. , 2010, 31(11): 3441-3446.

HUANG Shu-ling，FENG Xia-ting，ZHOU Hui，ZHANG Chuan-qing. Study of aging failure mechanics and triaxial compression creep experiments with water pressure coupled stress of brittle rock[J]. , 2010, 31(11): 3441-3446.

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