文献类型：期刊文献

英文题名：Instability and pillar burst mechanism in roof-pillar system with rock beam embedded in elastic foundation

作者：Wang, Xinrong[1];Guan, Kai[1];Liu, Jie[2,3];Liu, Xige[1]

机构：[1]Northeastern Univ, Sch Resource & Civil Engn, Ctr Rock Instabil & Seism Res, Shenyang 110819, Peoples R China;[2]Shaoxing Univ, Dept Civil Engn, 508 Huancheng West Rd, Shaoxing 312000, Zhejiang, Peoples R China;[3]Zhejiang Collaborat Innovat Ctr Prevent & Control, 508 Huancheng West Rd, Shaoxing 312000, Zhejiang, Peoples R China

年份：2021

卷号：80

期号：3

起止页码：2447

外文期刊名：BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT

收录：SCI-EXPANDED(收录号：WOS:000588875500003)、、EI(收录号：20204609496945)、Scopus(收录号：2-s2.0-85095998315)、WOS

基金：This study was supported by China Postdoctoral Science Foundation (No. 2018M641706), National Science Foundation of China (No. 51904057), Fundamental Research Funds for Central Universities of China (No.170104026), and Zhejiang Collaborative Innovation Center for Prevention and Control of Mountain Geological Hazards (No. PCMGH-2017-Y-04).

语种：英文

外文关键词：Rockburst; Elastic foundation; Instability; Strain softening; Roof-pillar system

外文摘要：Pillar burst depends not only on the pillar itself but also on other components of the roof-pillar system. Instability theory is applied to optimize the critical condition of pillar instability, thus minimizing the likelihood of a pillar burst event. The instability mechanism and evolution process of a pillar burst for a rock beam embedded in an elastic foundation (EF) are investigated. The unmined orebody (UMO) is considered to be an EF; the pillar's strain-softening behavior is described by a Weibull distribution. Pillar burst events occur in the post-peak strain-softening stage of the pillar and are mainly dependent on the pillar strength and stiffness ratio r(K) of the UMO-roof-pillar system. The EF coefficient k(f) reflecting the UMO property is an important factor affecting r(K). The maximum deviation of r(K) reaches up to 198% when the UMO is regarded as a rigid foundation (RF), which emphasizes the importance of k(f) in terms of overall system instability. A typical case of partial pillar recovery is simulated to demonstrate that EF hypothesis accurately reflects the UMO response in such a system. The instability conditions obtained by simulation analysis are consistent with the theoretical results. The instability of the UMO-roof-pillar system is the result of many factors, among which the thickness h(b) and span l of the rock beam are extremely sensitive. The lateral pressure coefficient does not significantly affect pillar instability and can be neglected to some extent. The pillar burst evolution process can be divided into a stability stage, subcritical instability stage, instability stage, and post-instability stage.