基于缺陷生长的岩石应变软化损伤本构模型研究

doi:10.13722/j.cnki.jrme.2017.0934

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摘要

从损伤角度分析岩石压缩变形过程微裂隙的演化特征，结果表明：岩石压缩变形过程可划分为弹性恢复、损伤保持、损伤开始、损伤加速和损伤变缓五个阶段。借助应变等效理论的“弹性模量法”，进一步研究岩石损伤演化规律。在此基础上，从岩石微元角度，建立基于岩石缺陷生长的损伤本构模型，实现对岩石损伤全过程统一、完整的描述。该模型仅用一个简单函数实现对应力–应变全过程的描述，且参数少、物理意义明确。试验数据与理论曲线比较，具有很好的一致性，说明了该模型的合理性。

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	刘冬桥1
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	张晓云1
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关键词 ：岩石力学, 压缩试验, 缺陷生长, 应变软化, 损伤演化, 本构模型

Abstract：

The defects evolution characteristics in the complete deformation process of rocks are analyzed，the results show that the stress-strain curves of rocks can be divided into five stages including elasticity recovery，damage retaining，damage initiation，damage acceleration and damage slow-down. Based on the“elastic modulus method”derived from the hypothesis of strain equivalence，damage evolution law is further studied. And a defects grown model is proposed based on the hypothesis of rock micro unit，and it can describe the complete damage evolution process well. Then a damage constitutive model is developed. This model can describe the complete deformation process of rocks satisfactorily. The used mathematical function is simple with just four model parameters，and each parameter has distinct physical meaning. Finally，the theoretical results fit very well with the test results in relevant references，which indicate the rationality of this model.

Key words： rock mechanics compression test defects growth strain softening damage evolution constitutive model

引用本文:

刘冬桥1，李东1，2，张晓云1，2，3. 基于缺陷生长的岩石应变软化损伤本构模型研究[J]. 岩石力学与工程学报, 2017, 36(S2): 3902-3909.
LIU Dongqiao1，LI Dong1，2，ZHANG Xiaoyun1，2，3. A new strain softening damage constitutive model for rocks based on defects growth. , 2017, 36(S2): 3902-3909.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2017.0934 或 https://rockmech.whrsm.ac.cn/CN/Y2017/V36/IS2/3902

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