Alternative fatigue-creep performance of rock-backfill composite structure material in mine stopes under high static stress: Disturbed amplitude effect

被引:2
作者
Wang, Yu [1 ]
Long, Dayu [1 ]
Yi, Xuefeng [1 ]
Mao, Tianqiao [2 ]
机构
[1] Univ Sci & Technol Beijing, Sch Civil & Resource Engn, Dept Civil Engn, Beijing Key Lab Urban Underground Space Engn, Beijing, Peoples R China
[2] Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, 19 Beitucheng West Rd, Beijing 100029, Peoples R China
基金
中国国家自然科学基金;
关键词
damage evolution; disturbed stress amplitude; mesoscopic cracking pattern; rock-backfill composite structure; CEMENTED PASTE BACKFILL; BEHAVIOR; SPECIMENS;
D O I
10.1111/ffe.14204
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
This work aims to investigate the dynamic stress amplitude on the mechanical responses of rock-backfill composite structure material under alternative low-cycle fatigue loading and creep loading tests. Results show that deformation, damage propagation, and failure pattern are all impacted by the stress amplitude, and volumetric deformation is the largest for a sample subjected to strong stress disturbance. The equivalent lifetime decreases with the increase of disturbed amplitude. A notable positive interaction between the fatigue damage and time-dependent damage is found, and they promote each other. Additionally, a novel damage evolution model is proposed by the irreversible radial strain, and the model matches well with the testing data. Moreover, post-test computed tomography imaging reveals that cracks at rock-backfill interfaces are relatively easy to be stimulated under low stress disturbance, and it is suggested that tension-splitting failure is more likely to occur within the surrounding rock, and shear failure seems to occur within the cemented tailings backfill for all the tested samples. Alternative LCF-CL tests were performed on RBCS samples.A high disturbed stress amplitude is likely to induce greater volumetric deformation.The cyclic damage and time-dependent damage promote each other.Splitting-tension failure occurs within rock and shear failure is found within CTB.
引用
收藏
页码:491 / 510
页数:20
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