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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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International Journal of Mining Science and Technology 2024年第11期34卷 1529-1549页

作者： Yajun Cao Xuelei Duan Wei Wang Qizhi Zhu Dengfeng Zhao Long Jiang Qiang Zhang Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai UniversityNanjing 210024China Institute of Geotechnical Engineering Hohai UniversityNanjing 210024China Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines Shenyang 110819China Momoke Water Conservancy Project Construction Management Bureau Kashgar 844900China Institute of Geotechnical Engineering China Institute of Water Resources and Hydropower ResearchBeijing 100048China

The complex and special mechanical properties of Xiyu conglomerate are of great significance to the construction of water conservancy and hydropower *** 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 compression test and 3D X-ray computed tomography *** results show that with increasing confining pressure,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 *** the porosity is negatively correlated with confining *** failure modes of Xiyu conglomerate include axial tensile cracks,shear cracks,local cross cracks and cracks around *** increasing confining pressure,the failure modes transform from tension cracks to shear cracks.A non-associated micromechanical damage model considering pressure dependent matrix presenting tension-compression asymmetry is proposed and applied to Xiyu conglomerate with pores and a large number of *** comparing numerical calculations and experimental results,the proposed micromechanical plastic damage model is able to describe the mechanical behavior of Xiyu conglomerate.

关键词： Xiyu conglomerate Crack characteristic stress Dilation behavior CT observation micromechanical plastic damage model

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