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大理岩弹性参数的围压效应与弹塑性耦合模型

ISSN号：1000-7598
期刊名称：岩土力学
时间：2013.6.6
页码：1613-1620
分类：TU458[建筑科学—岩土工程;建筑科学—土工工程]
作者机构：[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试验室,武汉430071, [2]云南华能澜沧江水电有限公司,昆明650011, [3]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221008
相关基金：国家自然科学基金项目（No.50979104,No.41172288）;中国科学院知识创新工程重要方向项目（No.KZCX2-EW-QN115）;国家重点基础研究发展计划（973）项目（No.2010CB732006）;国家自然科学基金项目（N0.51079144）.
相关项目：高应力下硬岩岩芯饼化机制、信息解译与工程应用

关键词：深埋大理岩, 弹性参数演化, 围压效应, 弹塑性耦合, 数值模拟, deep buried marble, evolution of elastic parameters, effect of confining pressure, elasto-plastic coupling, numerical simulation

中文摘要：

以锦屏二级水电站T2h和E2y^6深埋大理岩循环加、卸载试验结果为基础，对不同围压下大理岩弹性参数的演化规律进行研究，得出其弹性模量随围压和内变量的变化显著，而泊松比随围压则变化不明显。基于试验结果确定了锦屏大理岩弹性模量与围压和内变量的定量关系，建立了考虑弹性参数围压效应的大理岩弹塑性耦合模型，并在有限差分软件FLACm中进行了数值实现，用于模拟分析大理岩室内三轴压缩试验结果，并将模拟结果与不考虑弹性参数围压效应的计算结果进行对比，结果表明：考虑大理岩弹性参数围压效应的数值模拟与试验结果更吻合。研究方法和结果对于提高深部工程围岩（特别是具有小变形破坏特性的硬脆性围岩）变形计算的准确性具有重要的参考价值和借鉴意义。

英文摘要：

Based on the results of cyclic loading tests of two types of deep buried marbles T2b and Tie from Jinping II hydropower station, evolution of elastic parameters of marble under different confining pressures is studied. The results show that the elastic modulus changes significantly with the development of confining pressure and internal variable; while Poisson＇s ratio does not change significantly with confining pressure. Quantitative relationship between elastic modulus, confining pressure and internal variable is proposed based on the test results; and an elasto-plastic coupling model is set up considering the effect of confining pressure and implemented in FLAC3D by using C＋＋ language. Then, the result of triaxial compression test is simulated. By comparing the simulating results with and without considering the effect of confining pressure, it is shown that there is significantly better agreement between the simulating results considering the effect of confining pressure and test data. Efforts of this paper can give an important reference to numerical accuracy for rockmass of deep engineering, especially for brittle rockmass with the characteristic of fracturing under small deformation.

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