Experimental investigation on the macro-mechanical behavior and micromechanical damage model of Xiyu conglomerate with pores and inclusions under triaxial compression

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外文摘要：The complex and special mechanical properties of Xiyu conglomerate are of great significance to the con-struction of water conservancy and hydropower engineering.The crack characteristic stress,dilatancy behavior,and failure mechanism of Xiyu conglomerate collected from Momoke Water Control Project,southwestern China,were analyzed and discussed based on the experimental results of triaxial compres-sion test and 3D X-ray computed tomography test.The results show that with increasing confining pres-sure,the deformation characteristics and all characteristic stresses increase monotonically,while the dilation angle and dilatancy index decrease,and exponential function model can accurately describe the evolution rule of dilatancy index with confining pressure.While the porosity is negatively correlated with confining pressure.The failure modes of Xiyu conglomerate include axial tensile cracks,shear cracks,local cross cracks and cracks around gravel.With increasing confining pressure,the failure modes transform from tension cracks to shear cracks.A non-associated micromechanical damage model consid-ering pressure dependent matrix presenting tension-compression asymmetry is proposed and applied to Xiyu conglomerate with pores and a large number of gravels.By comparing numerical calculations and experimental results,the proposed micromechanical plastic damage model is able to describe the mechanical behavior of Xiyu conglomerate.

外文关键词：

Xiyu conglomerateCrack characteristic stressDilation behaviorCT observationMicromechanical plastic damage model

作者：

Yajun Cao、Xuelei Duan、Wei Wang、Qizhi Zhu、Dengfeng Zhao、Long Jiang、Qiang Zhang

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作者单位：

Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210024,China

Institute of Geotechnical Engineering,Hohai University,Nanjing 210024,China

Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines,Shenyang 110819,China

Momoke Water Conservancy Project Construction Management Bureau,Kashgar 844900,China

Institute of Geotechnical Engineering,China Institute of Water Resources and Hydropower Research,Beijing 100048,China

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出版年：

2024

DOI：

10.1016/j.ijmst.2024.10.006

矿业科学技术学报(英文版)

中国矿业大学

矿业科学技术学报(英文版)

CSTPCDEI

影响因子：1.222

ISSN：2095-2686

年,卷(期)：2024.34(11)