超前支承压力下巷道围岩失稳机理及模拟研究  

Mechanism and Simulation Study of Underground Tunnel Surrounding Rock Instability Under Advanced Support Pressure

作　　者：杜进朝 龙声德 曾诚 张江平 DU Jinchao;LONG Shengde;ZENG Cheng;ZHANG Jiangping(Guizhou Songhe Coal Industry Development Co.,Ltd.,Liupanshui 553000,China)

机构地区：[1]贵州松河煤业发展有限责任公司,贵州六盘水553000

出　　处：《河南科技》2024年第13期46-49,共4页Henan Science and Technology

摘　　要：【目的】研究工作面推进超前支承压力演化规律及巷道围岩失稳机制。【方法】以某采煤工作面为例,采用弹塑性力学理论分析工作面推进过程中超前支承压力变化特征,探讨超前支承压力作用下的关键层理论,在整个失稳过程中起到关键作用,运用3DEC模拟研究超前支承压力影响下巷道围岩失稳破坏特征。【结果】结果表明,巷道围岩呈现非对称变形,尤其是两帮的非对称变形表现最为显著。随着采矿工作的进行,巷道围岩受到叠加应力的扰动影响,超前支承压力对巷道顶板和两帮的影响差异化主要是由于顶板岩层的硬度较高,煤体相对岩层来说较为松软破碎,以及帮部已经提前产生裂隙,能够释放掉部分顶板压力。【结论】研究结果对于提高系统的稳定性和可靠性具有重要的意义,为预防和管理失稳提供了参考。[Purposes]This paper aims to study the evolution law of advance abutment pressure and the instability mechanism of surrounding rock in the coal face.[Methods]Taking coal mining face as an example,the elastic-plastic mechanics theory was used to analyze the characteristics of the pressure change of the lead support during the advancing process of the coal mining face,and the key layer theory under the action of the lead support pressure was discussed,which played a key role in the whole instability process,and 3DEC simulation is used to study the failure characteristics of roadway surrounding rock under the influence of advance abutment pressure.[Findings]The results show that the surrounding rock of the roadway presents asymmetric deformation,especially the asymmetric deformation of the two sides.With the mining process,the surrounding rock of the roadway is affected by the disturbance of superimposed stress,and the difference of the influence of the lead abutment pressure on the roof and the two sides of the roadway is mainly due to the high hardness of the roof rock as well as the relatively soft and broken coal body compared with the rock bed and the cracks in the side of the roadway have been produced ahead of time,which can release part of the roof pressure.[Conclusions]The results are of great significance to improve the stability and reliability of the system,enhance our understanding of the mechanism of instability failure,and provide important guidance for the prevention and management of instability.

关 键 词：支承压力 失稳机理 数值分析 关键层理论 

分 类 号：TD322[矿业工程—矿井建设]