分级循环加卸载作用下脆性岩石损伤特性分析  被引量:2

Analysis of Damage Characteristics of Brittle Rocks Under Staged Uniaxial Cyclic Loading and Unloading

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作  者:潘彬 娄培杰[1,2,3,4] 李成杰 冯明明[1] PAN Bin;LOU Peijie;LI Chengjie;FENG Mingming(School of Civil and Architectural Engineering, Anhui Inirersity of Science and Technology, H Hainan 232001. China;Open Lahoraiorv of Key Disciplines of Deep Mine Construction in Henan University,Jiaozuo 454000,China;Engineering Research Center of linderground Mine Construction of the Ministry of Education, HHainan 232001, China;Civil Engineering Postdoctoral Research Flou Station, Anhui University of Science and Technology, Hiudnan 232001, China)

机构地区:[1]安徽理工大学土木建筑学院,安徽淮南232001 [2]河南省高等学校深部矿井建设重点学科开放实验室,河南焦作454000 [3]矿山地下工程教育部工程研究中心,安徽淮南232001 [4]安徽理工大学土木工程博士后科研流动站,安徽淮南232001

出  处:《煤矿安全》2019年第3期203-207,共5页Safety in Coal Mines

基  金:河南省高等学校深部矿井建设重点学科开放实验室开放基金资助项目(2015KF-05);安徽省自然科学基金资助项目(1608085QE122);矿山地下工程教育部工程研究中心开放基金资助项目(2015KF04)

摘  要:以砂岩为研究对象,通过分级循环加卸载试验研究脆性岩石在分级循环加卸载作用下的损伤特性和演化规律。基于试验结果,定义了损伤值,推导出适用于加载阶段和卸载阶段的损伤本构模型。研究结果表明:提出的循环加卸载下的岩石损伤本构方程与试验应力应变曲线拟合度比较高,证明了其合理性和适用性。该损伤本构模型和定义的损伤值可以正确地反映出岩石的损伤演化过程,能够描述岩石破坏的各个阶段。参数敏感性对本构模型有不同程度的影响。Taking sandstone as the research object, the damage characteristics and evolution laws of brittle rocks under graded cyclic loading and unloading are studied through graded cyclic loading and unloading tests. Based on the test results, the damage values are defined and the damage constitutive models for loading and unloading stages are derived. The results show that the proposed constitutive equation of rock damage under cyclic loading and unloading has a high fitting degree with the experimental stress-strain curve, which proves its rationality and applicability. The damage constitutive model and the defined damage value can correctly reflect the damage evolution process of rock and describe each stage of rock failure. The sensitivity of parameters has different effects on the constitutive model.

关 键 词:循环荷载 损伤本构模型 脆性岩石 损伤值 参数敏感性 

分 类 号:TD315.1[矿业工程—矿井建设]

 

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