土木与环境工程学报（中英文）2024，Vol.46Issue(3)：103-114,12.DOI:10.11835/j.issn.2096-6717.2022.029
分级循环荷载下裂隙岩石疲劳破坏特性与能量演化机制
Fatigue failure characteristics and energy evolution mechanism of fractured rock under graded cyclic loading
摘要
Abstract
The crack propagation mode,fatigue deformation characteristics and energy evolution pattern of cracked rock under graded cyclic loading are of great significance to the safe construction and operation of underground engineering.Conventional splitting test,graded cyclic load test and non-contact deformation measurement test were carried out considering the crack angle,crack number and distribution.The failure characteristics and dynamic elastic modulus were analyzed,and the relationship between axial irreversible deformation and fatigue life was studied.From the perspective of energy,the total absorbed energy,released strain energy and dissipated energy in the failure process were calculated,and the relationship between energy evolution and the response of crack propagation mode was analyzed.The results show that:(1)The fatigue deformation of rock can be divided into the initial deformation stage,stable stage and the accelerated failure stage,and the hysteretic loop curve presents the characteristics of"thin-dense-thinness".The dynamic elastic modulus of every 200 cycles is analyzed and that of the second loading stage is strengthened.In addition,the dynamic elastic modulus decreases after the third loading stage.(2)The total absorbed energy,dissipated energy and elastic energy all showed an upward trend.The total absorbed energy increased slowly,and the growth rate gradually slowed down with the increase of cycles.The dissipated energy increases rapidly after entering the failure stage,but the elastic strain energy does not change obviously,and the dissipated energy is more in the middle dip angle.(3)During failure process,wing cracks and inclined secondary cracks are generated,and the interaction and merger of the cracks result in continuous plastic strain accumulation and small particle debris,which is different from the brittle failure mechanism under static load.关键词
裂隙岩石/裂隙扩展/疲劳变形/分级循环荷载/动弹性模量/能量演化Key words
fractured rock/crack propagation/fatigue deformation/graded cyclic load/dynamic modulus of elasticity/energy evolution分类
建筑与水利引用本文复制引用
王军祥,赵会敏,郭连军,李林,徐晨晖,孙港..分级循环荷载下裂隙岩石疲劳破坏特性与能量演化机制[J].土木与环境工程学报（中英文）,2024,46(3):103-114,12.基金项目
国家自然科学基金(51974187、51774066) （51974187、51774066）
辽宁省自然科学基金(2019-MS-242) （2019-MS-242）
辽宁省教育厅重点攻关项目(LZGD2020004) （LZGD2020004）
中国博士后科学基金(2018M630293) （2018M630293）
沈阳工业大学重点科研基金项目(ZDZRGD2020005). National Natural Science Foundation of China(Nos.51974187,51774066) （ZDZRGD2020005）
Liaoning Natural Science Foundation(No.2019-MS-242) （No.2019-MS-242）
Liaoning Provincial Education on Department Focuses on Tackling Key Problems(No.LZGD2020004) （No.LZGD2020004）
China Postdoctoral Science Foundation(No.2018M630293) （No.2018M630293）
Key Scientific Research Foundation Project of Shenyang University of Technology(No.ZDZRGD2020005). （No.ZDZRGD2020005）
