矿震诱发高应力巷道厚顶煤动力失稳机制  

Mechanisms behind mine earthquake-induced dynamic instability of thick top coals in high-stresses roadways

作　　者：周坤友 窦林名[3] 曹安业[3] 马衍坤[1] 阚吉亮 李家卓[2] 马小涛[3] ZHOU Kunyou;DOU Linming;CAO Anye;MA Yankun;KAN Jiliang;LI Jiazhuo;MA Xiaotao(Key Laboratory of Safe and Effective Coal Mining,Ministry of Education,Anhui University of Science and Technology,Huainan 232001,China;School of Mining Engineering,Anhui University of Science and Technology,Huainan 232001,China;School of Mines,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]安徽理工大学煤矿安全高效开采省部共建教育部重点实验室,安徽淮南232001 [2]安徽理工大学矿业工程学院,安徽淮南232001 [3]中国矿业大学矿业工程学院,江苏徐州221116

出　　处：《煤田地质与勘探》2024年第10期25-35,共11页Coal Geology & Exploration

基　　金：国家自然科学基金项目(52304197);煤矿安全高效开采省部共建教育部重点实验室基金项目(JYBSYS202301);国家重点研发计划项目(2022YFC3004603)。

摘　　要：【目的】厚煤层沿底掘进煤巷普遍存在厚顶煤,工作面矿震对巷道厚顶煤产生动载作用,易诱发厚顶煤动力失稳和冒顶-冲击复合灾害,亟需探究矿震动载作用下巷道厚顶煤动力失稳机制。【方法】以陕西彬长矿区深部厚顶煤巷道为工程背景,调研分析深部高应力巷道厚顶煤动力失稳特征,数值模拟研究不同静动载作用下巷道厚顶煤多场演化规律,提出矿震诱发高应力巷道厚顶煤动力失稳机制。【结果和结论】结果表明,巷道厚顶煤冒顶区域距回采工作面较远,冒顶后裸露平整顶板,顶板锚索拉断,冒顶区域附近均发生大能量矿震,呈现冒顶-冲击复合灾害现象。随静载增加,巷道围岩裂隙发育深度及变形不断增加;随动载作用时间和动载强度增大,顶煤震动速度、加速度及裂隙发育程度不断增大,顶煤离层量显著增加;顶板锚杆索均位于顶煤裂隙发育区,支护性能大幅降低。静动载作用下巷道厚顶煤累积损伤及离层量不断增大,大能量矿震动载使浅部破碎顶煤震动速度及加速度显著增大,作用在锚索上载荷超过其承载能力,锚索被拉断,浅部破碎煤体以较高速度冒落,诱发厚顶煤动力失稳和冒顶-冲击复合灾害。在此基础上,提出了采用重建厚顶煤主被动支护和加强卸压的深部巷道厚顶煤动力失稳灾害的防治方法。[Objective]Thick top coals are common in roadways excavated along the bottom of thick coal seams.Mine earthquakes along the mining face can exert dynamic loading on thick top coals in roadways,prone to induce the dynam-ic instability of thick top coals and even roof fall-rock burst compound disasters.Therefore,there is an urgent need to ex-plore the mechanisms behind the dynamic instability of thick top coals in roadways under dynamic loading induced by mine earthquakes.[Methods]This study investigated a roadway of deep thick top coals in the Binchang mining area,Shaanxi.Specifically,this study analyzed the dynamic instability characteristics of deep thick top coals in the high-stress roadway,investigated the multi-field evolutionary patterns of thick top coals in the roadway under different static/dy-namic loading using numerical simulations,and determined the mechanisms behind the mine earthquake-induced dy-namic instability of thick top coals in high-stress roadways.[Results and Conclusions]The results indicate that the roof fall zone of thick top coals in the roadway is far from the mining face.Roof falls were followed by the exposure of the flat roof and the breaking of anchor cables in the roof.Concurrently,high-energy mine earthquakes occurred near the roof fall zone,resulting in roof fall-rock burst compound disasters.An increase in static load corresponded to continu-ously increasing fracture depths and deformations of surrounding rocks in the roadway.As the time and intensity of dy-namic loading increased,the vibration velocity,acceleration,and fracture developmental degree of top coals increased gradually,along with significantly increasing detachment layer number of top coals.The anchor bolts and cables for the roof,all located in the fracture zone of top coals,showed significantly reduced support performance.Under the static/dy-namic loading,the cumulative damage and detachment layer number of thick top coals in the roadway increase gradu-ally.The dynamic loading induced by high-energy mine earthquak

关 键 词：深部开采 巷道厚顶煤 矿震 多场演化 支护结构 动力失稳 

分 类 号：TD324[矿业工程—矿井建设]