Estimates of strength and cracking behaviors of pre-flawed granite specimens treated by chemical corrosion under triaxial compression tests

作     者：Zhicong LI Richeng LIU Shuchen LI Hongwen JING Xiaozhao LI Liyuan YU Zhicong LI;Richeng LIU;Shuchen LI;Hongwen JING;Xiaozhao LI;Liyuan YU

作者机构：State Key Laboratory for Geomechanics and Deep Underground EngineeringChina University of Mining and TechnologyXuzhou 221116China 

出 版 物：《Frontiers of Earth Science》 (地球科学前沿（英文版）)

年 卷 期：2022年第16卷第2期

页      面：411-434页

核心收录：

学科分类：0709[理学-地质学] 070901[理学-矿物学、岩石学、矿床学] 07[理学] 

基　　金：This study has been partially funded by the National Key Research and Development Program of China,China(Grant No.2020YFA0711800) the National Natural Science Foundation of China(Grant Nos.51734009,51979272,and 52179118) Natural Science Foundation of Jiangsu Province,China(No.BK20211584).These supports are gratefully acknowledged 

主　　题：granites preexisting flaws chemical corrosion triaxial compression strength cracking behavior 

摘      要：Four types of granite specimens were prepared and treated by chemical corrosion for 5 and 30 days,which were then used to carry out triaxial compression tests under different confining pressuresσ_(3).Type A is the intact sample with no preexisting *** B and C are the samples containing two relatively low-dip flaws and two relatively high-dip flaws,*** D is the sample including both relatively low-dip and relatively high-dip *** influences of pH value of chemical solutions,flaw distribution,corrosion time andσ_(3) on triaxial stress-strain curves and ultimate failure modes are analyzed and *** results show that the pH value of the chemical solution,corrosion time and the arrangement of preexisting flaws play crucial roles in the cracking behaviors of granite *** A specimens have the largest peak axial deviatoric stress,followed by Type C,Type D,and Type B specimens,*** is because the decrease in the inclination of preexisting flaws induces the weakening effect due to the decrease in the shadow area along the compaction *** aσ_(3) of 5 MPa,the peak axial deviatoric stress drops by approximately 40.89%,29.08%,4.08%,and 23.53%for pH=2,4,7,and 12,*** intact granite(Type A)specimens,the ultimate failure mode displays a typical shear *** connection of two secondary cracks initiated at the tips of preexisting cracks is always the ultimate failure and crack coalescence mode for Type B *** ultimate failure and crack coalescence mode of Types C and D specimens are significantly affected by pH value of the chemical solution,corrosion time andσ_(3),which is different from those of Types A and B specimens due to the differences in flow distributions.