Lateral abutment pressure distribution and evolution in wide pillars under the first mining effect

作     者：Zhen Zhang Zhen Li Gang Xu Xiaojin Gao Qianjin Liu Zhengjie Li Jiachen Liu Zhen Zhang;Zhen Li;Gang Xu;Xiaojin Gao;Qianjin Liu;Zhengjie Li;Jiachen Liu

作者机构：Coal Mining and Designing BranchChina Coal Research InstituteBeijing 100013China CCTEG Coal Mining Research InstituteBeijing 100013China Coal Mining&Designing DepartmentTiandi Science&Technology Co.Ltd.Beijing 100013China School of Civil EngineeringHenan Polytechnic UniversityJiaozuo 454003China Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency UtilizationJiaozuo 454003China 

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

年 卷 期：2023年第33卷第3期

页      面：309-322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] 0818[工学-地质资源与地质工程] 0837[工学-安全科学与工程] 

基　　金：We gratefully acknowledge financial support from the National Natural Science Foundation of China(NSFC)(No.51704097) Science Foundation of Henan Polytechnic University(No.J2021–2) Key Research and Development Program of Henan Province,China(No.202102310244) “Science and Technology to Help the Economy 2020”Key Project(No.SQ2020YFF0426364). 

主　　题：Wide pillar Lateral abutment pressure Pillar stress First mining effect Field monitoring 

摘      要：The wide pillars are generally popular due to the high productivity and efficiency in Northwest China.The distribution of lateral abutment pressure in coal pillars is important for mining safety.To reveal the effect of the first mining on the lateral abutment pressure distribution and evolution in wide pillars,an in-situ experiment,theoretical analysis and numerical simulation were performed.First,the field monitoring of lateral abutment pressure was conducted from the perspective of time and space in the Chahasu Coal Mine,Huangling No.2 Coal Mine and Lingdong Coal Mine during the first mining.Based on the field monitoring stress,a theoretical model was proposed to reveal the lateral abutment pressure distribution.The methodology was demonstrated through a case study.Aiming at the distribution mechanism,a numerical experiment was conducted through the finite-discrete element method(FDEM).Last,field observations of borehole fractures were performed to further study the damage distribution.In addition,two types of lateral abutment pressure evolution with mining advance were discussed.Suggestions on the stress monitoring layout were proposed as well.The results could provide foundations for strata control and disaster prevention in wide pillars in underground coal mines.