Strength properties and evolution laws of cracked sandstone samples in re-loading tests

作     者：Yijiang Zong Lijun Han Qinbin Meng Yingchao Wang Yijiang Zong;Lijun Han;Qinbin Meng;Yingchao Wang

作者机构：State Key Laboratory for Geomechanics and Deep Underground EngineeringChina University of Mining&TechnologyXuzhou 221116China School of Transportation EngineeringJiangsu Vocational Institute of Architectural TechnologyXuzhou 221116China 

出 版 物：《International Journal of Mining Science and Technology》 (矿业科学技术学报（英文版）)

年 卷 期：2020年第30卷第2期

页      面：251-258页

核心收录：

学科分类：081901[工学-采矿工程] 0819[工学-矿业工程] 08[工学] 

基　　金：Financial support for this work is gratefully acknowledged,provided by the National Natural Science Foundation of China(Nos.51323004,51574223) the China Postdoctoral Science Foundation(No.2015M571843) the Natural Science Foundation of Jiangsu Province of China(No.BK20160208) the University Nature Science Research Projects of Jiangsu Province of China(No.17KJB440003) the Open Research Fund of Research Center of Jiangsu Collaborative Innovation Center for Building Energy Saving and Construction Technology of China(No.SJXTY1502) 

主　　题：Rock mechanics Damage Re-loading Strength characteristics Strain hardening 

摘      要：To study the strength properties and evolution laws of cracked sandstone samples in re-loading tests,strength and damage evolution properties of intact sandstone samples were first analyzed through the triaxial compression tests carried on TAW-2000 microcomputer control electro-hydraulic servo rock triaxial test *** evolution models were established based on dilatancy properties realizing the real-time and quantitative evaluation of samples damage state in loading *** this basis,samples with different damage were obtained by pre-peak,peak point,post-peak and residual strength stage unloading tests in the loading process of intact *** characteristics of the stress-strain curves and strength evolution laws were studied through the re-loading tests of samples with different damage under different stress *** experimental results showed that the slope of stress-strain curves,peak strength and residual strength of cracked samples increased linearly with confining pressure and decreased linearly with *** equivalent cohesion decreased with damage in the exponential decay *** mechanics properties of samples transformed from strain softening to strain hardening with damage.