深部条带开采高位关键层离层区周边冲击危险性研究  

Rock burst risk in surrounding abscission layer of overlying high key strata in deep strip mining mines

作　　者：姜福兴[1] 温经林[1] 白武帅 王桂利 李明 JIANG Fuxing;WEN Jinglin;BAI Wushuai;WANG Guili;LI Ming(School of Civil and Resources Engineering,University of Science and Technology Beijing, Beijing 100083, China;SUMEC International Technology Co. ,Ltd, Nanjing,Jiangsu 210037,China;Gucheng Coal Mine, Linyi Mining Group, Yanzhou, Shandong 272100, China;Honghui No. 1 Coal Mine,Gansu Jingyuan Coal and Electricity Co. ,Ltd, Baiyin,Gansu 730918, China)

机构地区：[1]北京科技大学土木与资源工程学院,北京100083 [2]苏美达国际技术贸易有限公司,江苏南京210037 [3]临沂矿业集团古城煤矿,山东兖州272100 [4]甘肃靖远煤电股份有限公司红会一矿,甘肃白银730918

出　　处：《中国矿业大学学报》2018年第1期40-47,共8页Journal of China University of Mining & Technology

基　　金：国家重点研发计划项目(2016YFC0801408);国家自然科学基金项目(51674014);国家自然科学基金重点项目(51634001)

摘　　要：近年来深部条带开采矿井发生了多起冲击地压事故.事故数据表明,在具有高位关键层的深部条带开采矿井,冲击事件分布具有一定的规律:冲击集中发生在已开采区域周边位置.通过建立关键层离层力学模型,分析了关键层极限跨度与采场尺寸的关系和关键层挠度与关键层下方煤柱压缩量的关系,探讨了高位关键层离层形成条件和离层对周边区域应力分布的影响规律,揭示了深部条带开采关键层离层区周边冲击地压发生机理.研究表明:条带煤柱在两侧采空区传递应力作用下被压缩,导致关键层离层形成应力传递结构.该结构将关键层上方岩层的载荷传递到离层区周边区域,使周边区域应力集中程度明显增加,从而导致该区域冲击地压频繁发生.关键层离层区周边冲击危险性与关键层离层跨度和关键层上方岩层厚度成正相关.研究成果对于类似条件下冲击地压防治具有指导意义.In recent years,many rock burst accidents have occurred in strip mining mines.Analysis of accident data demonstrates that in the deep strip mining mines with high key strata,the rock burst occurrence regularly concentrates around the exploited areas.By establishing a key strata abscission layer mechanical model,the correlation between the span limit of key strata and the stope size,as well as the deflection of the key strata and the compression amount of the remnant isolated coal pillars were analyzed.The formation condition of abscission layer and its effect on stress distribution in surrounding areas were discussed.Results show that the remnant isolated coal pillars were compressed under the stress transferred from overlying strata of both gob sides,which formed the stress transferring structure in abscission layer of key stra-ta.This structure transferred the stress of overlying strata to surrounding separation areas which lead to obvious increase of the surrounding stress,and frequent occurrence of the rock burst in these areas.A positive correlation was found between the rock burst risk surrounding the abscission layer of key strata and the span of abscission layer as well as the rock strata thickness above the key strata.This study provides a theoretical basis for rock burst prevention in similar geological conditions.

关 键 词：深井 条带开采 关键层 离层 冲击地压 应力转移 

分 类 号：TD324[矿业工程—矿井建设]