一种改进的岩石弹塑性模型及其在三轴循环加卸载试验中的应用

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中文摘要：在传统的弹塑性理论中，岩石的可恢复应变被完全归纳为弹性应变，这导致理论预测和实验曲线之间存在一定的偏差。本文提出了一种改进的岩石材料的弹塑性模型，考虑了裂纹变形参数和弹性模量随塑性变形的演变，以更好地表征岩石在峰后阶段的非线性力学行为。在该模型中，假设可恢复应变是由弹性应变和裂纹应变组成，并推导了岩石应力与裂纹应变之间的本构关系。基于所提出的假设，研究了包括强度、弹性、塑性和裂纹变形参数在内的一系列力学参数与塑性剪应变和围压之间的演变关系。通过将理论计算值与三轴循环加卸载试验结果进行比较，验证了该模型的准确性。理论计算结果与室内试验吻合较好，表明所提出的力学模型能够有效地反映岩石材料的非线性力学行为。研究结果有望为进一步了解岩石裂纹变形的演化提供有价值的参考。

外文标题：An improved elastoplastic model for rocks and application to cyclic loading and unloading triaxial compression tests

外文摘要：The recoverable strain of rock is completely classified as elastic strain in the conventional elastic-plastic theory,which often results in poor agreement between theoretical and experimental curves.This work proposes an improved elastoplastic model of rock materials considering the evolutions of crack deformation and elastic modulus to better characterize the nonlinear mechanical behavior of rock in the post-peak stage.In this model,the recoverable strain is assumed to be a combination of elastic and crack strain,and the constitutive relationship between crack strain and rock stress is deduced.Based on the proposed assumption,the evolutions of the mechanical parameters including strength parameters,elastic,plastic,and crack deformation parameters versus the plastic strain and confining stress were investigated.The developed elastoplastic model was validated by comparing the theoretical values with the results of the triaxial cyclic loading and unloading test.The theoretical calculation results show a good agreement with the laboratory test,which indicates that the improved elastoplastic model can effectively reflect the nonlinear mechanical behavior of the rock materials.The research results are expected to provide a valuable reference for further understanding the evolution of rock crack deformation.

外文关键词：

Crack strainElastic modulus deteriorationNovel elastoplastic modelModel validation

作者：

谷邱鑫、张强、李亚鹏、吴培楠、韩贵雷

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作者单位：

State Key Laboratory for Geomechanics and Deep Underground Engineering,School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221H6,China

North China Engineering Investigation Institute,Shijiazhuang 050021,China

关键词：

Crack strain Elastic modulus deterioration Novel elastoplastic model Model validation

基金：

National Natural Science Foundation of ChinaPostgraduate Research & Practice Innovation Program of Jiangsu ProvinceGraduate Innovation Program of China University of Mining and Technology

项目编号：

520742692024WLKXJ202

出版年：

2024

DOI：

10.1007/s10409-024-24053-x

力学学报(英文版)

CSTPCD

影响因子：0.363

ISSN：0567-7718

年,卷(期)：2024.40(8)