冻融荷载耦合作用下节理岩体损伤本构模型

doi:10.13722/j.cnki.jrme.2014.1342

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摘要针对寒区节理岩体，提出冻融细观损伤，受荷细观损伤与节理宏观损伤的概念。基于Lemaitre应变等效假设，推导冻融受荷条件下考虑节理岩体宏细观缺陷耦合的复合损伤变量。以完整岩石的初始损伤状态作为基准损伤状态，建立节理岩体冻融受荷损伤本构模型，引用试验资料对模型的合理性进行验证。研究结果表明：(1) 岩石在冻融循环过程中引起的细观损伤是一个周期性疲劳破坏的过程，冻融细观损伤随冻融次数近似线性增加，单次冻融循环对岩石造成的损伤较小，为局部损伤；岩石在受荷过程中引起的细观损伤随应变的演化率呈不均匀分布，峰值应变处受荷损伤演化率最大。(2) 预制节理对岩石造成的宏观损伤具有明显各向异性，随冻融循环次数的增加，节理岩样的宏观各向异性有所弱化，弱化程度同节理性质和冻融循环次数有关。(3) 寒区受荷节理岩体的力学性能由冻融细观损伤，受荷细观损伤与节理宏观损伤及其耦合效应所决定，节理岩体冻融受荷复合损伤变量可以较好地反映节理岩体的抗冻性能。

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关键词 ：岩石力学, 节理岩体, 冻融荷载, 宏观缺陷, 细观缺陷, 损伤耦合, 本构模型

Abstract：The concepts of the mesoscopic damage caused by freezing and thawing，the mesoscopic damage caused by loading and the macroscopic damage caused by joints were proposed for the jointed rock in cold regions. The compound damage variable of jointed rock considering the coupling of the macroscopic and mesoscopic flaws was deduced based on the strain equivalence hypothesis of Lemaitre under freezing-thawing and loading conditions. Defining the initial damage state of intact rock as the basic state，a constitutive model considering the freezing-thawing and loading damage for jointed rock was established. Finally，the experimental data was adopted to test the validity of this model. The mesoscopic damage caused by freezing-thawing was found to be a cyclical process of fatigue damage and to increase approximately linearly with the freezing-thawing cycles. The mesoscopic damage caused by the single freezing-thawing cycle was small，and was called the local damage. The mesoscopic rate of damage caused by loading varied unevenly in the process of strain increasing and reached the maximum at the peak strain. The macroscopic damage of rock with precast joints exhibited significant anisotropy and decreased with the freezing-thawing cycles. The joint properties and the freezing-thawing cycles were the critical factors for the weakening of anisotropy. The mechanical properties of jointed rock under loading in cold regions were determined by the mesoscopic damage of freezing-thawing，the mesoscopic damage of loading，macroscopic damage with joints and the coupling effects. The frost resistance of jointed rock was described well with the compound damage variable of freezing-thawing and loading.

Key words： rock mechanics rock with joints freeing-thawing and loading macroscopic flaw mesoscopic flaw damage coupling constitutive model

引用本文:

袁小清1，刘红岩1，2，刘京平1. 冻融荷载耦合作用下节理岩体损伤本构模型[J]. 岩石力学与工程学报, 2015, 34(08): 1602-1611.
YUAN Xiaoqing1，LIU Hongyan1，2，LIU Jingping1. A DAMAGING MODEL OF JOINTED ROCK UNDER COUPLED ACTION OF FREEZING AND THAWING. , 2015, 34(08): 1602-1611.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2014.1342 或 http://www.rockmech.org/CN/Y2015/V34/I08/1602

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