摘要
基于N2105工作面位于褶曲构造区的进风平巷发生底板冲击地压事故为工程背景,采用现场调研、理论分析、数值模拟、微震监测和井下试验等手段,对底板变形破坏机制与控制对策进行了研究。结果表明:褶曲构造区侧压系数λ值最小为1.56,最大为2.18,为强构造应力影响区;随着侧压系数的增大,底板应力集中大小和程度变大,且存在一突变点,当λ>1.5后巷道底板塑性区范围急剧扩大,底板围岩稳定性急剧恶化;巷帮大直径钻孔卸压能够有效抑制动静载组合叠加强度,对底板变形破坏有很好的防治作用。
Based on the engineering background of wind drift floor burst accident in N2105 working face located in the fold zone,theoretical analysis,numerical simulation,microseismic monitoring and underground tests were carried to study the failure mechanism and control measures of floor deformation. The results show that the fold zone is a strong tectonic stress zone as the minimum lateral pressure coefficient is 1. 56,and the maximum is 2. 18; with the increase of lateral pressure coefficient,the floor stress concentration degree increases,and there is a mutation point,when lambda is over 1. 5 the roadway floor plastic area expands sharply,and the surrounding rock stability of floor deteriorate rapidly; large diameter borehole pressure relief in roadway ribs can effectively restrain the combination strength of static and dynamic load,and achieve favorable control effect against floor deformation.
作者
何富连
郑铮
杨增强
杜朝阳
赵勇强
李政
HE Fu - lian ZHENG Zheng YANG Zeng - qiang DU Chao - yang Zhao Yong - qiang LI Zheng(Collage of Resource and Safety Engineering, China University of Mining and Technology（ Beijing）, Beijing 100083, China)
出处
《煤炭工程》
北大核心
2017年第9期105-109,共5页
Coal Engineering
基金
国家自然科学基金重点资助项目(51234005
51574243)
中央高校基本科研业务费专项资金资助项目(2010YZ02)
关键词
褶曲构造区
底板破坏
FLAC^2D
侧压系数
大直径钻孔
fold structure
floor impact
FLAC2D numerical simulation
lateral pressure coefficient
large diameter borehole
