摘要
“屈服-支承”组合煤柱是指将宽窄煤柱进行结合,通过屈服让压与稳定支撑同时作用从而防止煤柱发生冲击失稳。本研究以鄂尔多斯某冲击地压矿井290 m宽采区边界煤柱为背景,基于极限平衡理论设计“屈服-支承”组合方案,并采用有限元法模拟其在相邻长壁工作面采动下的应力演化与破坏过程,明确了回采期间的典型应力集中区。结果表明:屈服煤柱全域及其毗邻的支承煤柱内20 m范围、远离屈服煤柱侧的50 m范围均呈现显著高水平的应力集中;支承煤柱内部约136 m宽区域则为低应力区。在750 m采深条件下,屈服煤柱临界宽度为33.7 m,当前设计的屈服煤柱满足稳定性要求。动态模拟进一步阐明了该组合结构的力学行为:40 m宽屈服煤柱通过发生大范围塑性变形有效耗散覆岩变形能,引导应力向两侧支承煤柱转移,最终形成非对称应力场,致使支承煤柱临空侧的应力峰值及塑性区深度显著大于煤柱实体侧。本研究的核心工程价值在于,在深部冲击地压矿井用屈服-支承组合煤柱代替传统的单煤柱设计以更有效地减小冲击地压影响并根据应力分布结果明确划分了防冲重点防控区域,指导工程实践时可对此区域针对性加强支护或实施卸压措施,从而实现科学精准防控。研究成果对我国深部冲击地压矿井中“屈服-支承”组合煤柱的设计具有借鉴意义。
A yield-support composite coal pillar system integrates both narrow and wide pillars.It functions by combining mechanisms of yieldable ground release and stable support to prevent impact-induced instability(Coal burst)in coal pillars.This study is based on the boundary coal pillars of a 290 m wide extraction area located in an outburst-prone mine in Ordos.It designs a"yield-support"combined scheme based on limit equilibrium theory and employs the finite element method to simulate the stress evolution and failure process under the mining-induced activities of the adjacent longwall face,clarifying the typical stress concentration areas during mining.The results indicate significant high-stress concentrations throughout the entire yield pillar and within a 20-meter zone of the adjacent supporting pillar,as well as in a 50-meter zone on the side of the supporting pillar farthest from the yield pillar.In contrast,an approximately 136m-wide area inside the supporting pillar constitutes a low-stress zone.At a mining depth of 750m,the critical width for the yield pillar is determined to be 33.7 m;the currently designed yield pillar satisfies this stability requirement.Dynamic simulation further elucidates the mechanical behavior of the composite structure:a 40 m wide yield coal pillar effectively dissipates the deformation energy of the overlying strata through extensive plastic deformation,redirecting stress toward the two adjacent bearing coal pillars.This ultimately results in an asymmetric stress field,where the stress peak and plastic zone depth on the goaf side of the bearing coal pillars are significantly greater than those on the solid coal side.The core engineering value of this study lies in replacing traditional single coal pillar designs with yield-bearing composite coal pillars in deep rock burst-prone mines to more effectively mitigate rock burst impacts.Based on the stress distribution results,key anti-rock burst prevention zones are clearly delineated.In practical engineering applications,targeted reinforcement support or pressure relief measures can be implemented in these areas,thereby achieving scientific and precise prevention and control.The research findings provide valuable insights for the design of"yield-bearing"composite coal pillars in deep rock burst-prone mines in China.
作者
郭政君
史庆稳
刘杰
孙金涛
欧阳振华
程义坤
秦洪岩
韩哲
王家阳
胡朝旺
洪奥坤
王鑫爽
王翔宇
李建忠
石垚
GUO Zhengjun;SHI Qingwen;LIU Jie;SUN Jintao;OUYANG Zhenhua;QIN Hongyan;HAN Zhe;WANG Jiayang;HU Chaowang;HONG Aokun;WANG Xinshaung;WANG Xiangyu;LI Jianzhong;SHI Yao(School of Mining Safety,University of Emergency Management,Yanjiao 065201,China;Inner MongoliaZhongtai Energy Group Co.,Ltd.Yiqi Branch,Ordos,017000,China;CCTEG Coal Mining Research Institute,Beijing 100013,China)
出处
《华北科技学院学报》
2026年第1期173-183,共11页
Journal of North China Institute of Science and Technology
基金
河北省自然科学基金项目(E2023508026)
中央高校基本科研业务费项目(3142023009)。
关键词
冲击地压
屈服-支承组合煤柱
数值模拟
极限平衡理论
应力演化
rock burst
yield-support composite coal pillar
numerical simulation
limit equilibrium theory
stress evolution
