Microscopic cracking behaviors of rocks under uniaxial compression with microscopic multiphase heterogeneity by deep learning  

作　　者：Zhi Zhao Yundong Shou Xiaoping Zhou 

机构地区：[1]School of Civil Engineering,Wuhan University,Wuhan 430072,China [2]National Center for International Research on Deep Earth Drilling and Resource Development,Faculty of Engineering,China University of Geosciences(Wuhan),Wuhan 430074,China

出　　处：《International Journal of Mining Science and Technology》2023年第4期411-422,共12页矿业科学技术学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.42207193,52027814,and 51839009);the Natural Science Foundation of Hubei Province(No.2022CFB609);the National Center for International Research on Deep Earth Drilling and Resource Development(No.DEDRD-2022-07);the Fundamental Research Funds for the Central Universities(No.2042021kf0058)。

摘　　要：Cracking behaviors of rocks significantly affect the safety and stability of the explorations of underground space and deep resources.To understand deeply the microscopic cracking process and mechanical property of rocks,X-ray micro-computed tomography(X-μCT)is applied to capture the rock microstructures.The digital color difference UNet(DCD-UNet)-based deep learning algorithm with 3D reconstruction is proposed to reconstruct the multiphase heterogeneity microstructure models of rocks.The microscopic cracking and mechanical properties are studied based on the proposed microstructure-based peridynamic model.Results show that the DCD-UNet algorithm is more effective to recognize and to represent the microscopic multiphase heterogeneity of rocks.As damage characteristic index of multiphase rocks increases,transgranular cracks in the same grain phase,transgranular and intergranular cracks of pore-grain phase,intergranular and secondary transgranular cracks and transgranular crack between different grains propagate.The ultimate microscopic failure modes of rocks are mainly controlled by the transgranular cracks-based T1-shear,T3-shear,T1-tension,T2-tension and T3-tension failures,and the intergranular cracks-based T1-tension,T1-shear and T3-shear failures under uniaxial compression.

关 键 词：X-μCT imaging Deep learning Microscopic multiphase heterogeneity Uniaxial compression Transgranular-intergranular cracks 

分 类 号：TP18[自动化与计算机技术—控制理论与控制工程] TU45[自动化与计算机技术—控制科学与工程]