岩石卸荷力学特性及本构模型研究进展

发布时间：2018-06-18 00:43

本文选题：岩石力学 + 卸荷试验　；参考：《长江科学院院报》2017年07期

【摘要】：近年来,国内外一些学者基于围压卸荷试验,对岩石的卸荷力学特性和本构模型进行了大量的研究,取得了丰硕的成果。卸荷条件下岩石的强度特征、变形规律和破坏模式与加载状态相比有着显著的区别,通过围压卸荷试验可以发现,卸荷条件下岩石张性裂缝发育,扩容显著,通常呈张剪性破坏,且卸荷速率、围压和应力路径等因素均对其变形破裂机制有着较大的影响。卸荷条件下岩石的本构模型通常分为唯象学本构模型和细观力学本构模型,唯象学模型忽视了岩石卸荷渐进破坏的演化机制,细观力学本构模型则未考虑微裂纹群及数学简化引起的误差等,这些问题使得未来的卸荷岩石力学研究工作充满了机遇与挑战。
[Abstract]:In recent years, some scholars at home and abroad have done a lot of research on rock unloading mechanical properties and constitutive models based on confining pressure unloading test, and have made great achievements. Under unloading conditions, the strength characteristics of rock, the law of deformation and the failure mode are distinctions compared with the loading state, and the unloading test can be found by confining pressure unloading test. Under the condition of load, the tensile fracture of rock is remarkable, and the tensile shear failure is usually presented, and the unloading rate, the confining pressure and the stress path have great influence on the deformation and fracture mechanism. The constitutive model of rock under unloading condition is usually divided into phenomenological constitutive model and meso mechanical constitutive model, and the phenomenological model ignores the rock. The evolution mechanism of unloading progressive failure and the meso mechanical constitutive model are not considered by the micro crack group and the error caused by mathematical simplification. These problems make the research work of unloading rock mechanics full of opportunities and challenges in the future.
【作者单位】：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;长江勘测规划设计研究院;
【基金】：国家重点基础研究发展计划(973)项目(2015CB057905) 国家自然科学基金面上项目(51279202) NSFC-云南联合基金重点支持项目(U1402231)
【分类号】：TU452

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