沟壑地貌下综放开采覆岩破断特征研究  

Failure characteristics of overlying strata in fully mechanized caving under gully landforms

作　　者：申斌学 朱磊 朱德福[3] 陈娜 SHEN Bin-xue;ZHU Lei;ZHU De-fu;CHEN Na(China Coal Xi'an Design Engineering Co.,Ltd.,Xi'an 710054,China;China Coal Energy Research Institute Co.,Ltd.,Xi'an 710054,China;Taiyuan University of Technology,Taiyuan 030600,China;Shaanxi Geology and mining Geophysical and Geochemical Prospecting Team Co.,Ltd.,Xi'an 710043,China)

机构地区：[1]中煤西安设计工程有限责任公司,陕西西安710054 [2]中煤能源研究院有限责任公司,陕西西安710054 [3]太原理工大学,山西太原030600 [4]陕西地矿物化探队,陕西西安710043

出　　处：《煤炭工程》2021年第7期1-6,共6页Coal Engineering

摘　　要：针对沟壑地貌下综放开采工作面矿压显现强烈、来压规律异常的现象,以王家岭煤矿12309工作面经过沟壑地貌下的推进过程为工程背景,综合采用数值模拟和相似模拟的研究方法,分析了工作面推进过程中的覆岩运移和破断特征以及塑性区演化规律,揭示了沟壑地貌对综放开采矿压显现的影响机理。研究结果表明:主关键层的破断将引起基岩和黄土层之间的离层,使得裂隙贯通至地表形成裂缝,此时沟壑地貌的地表不均布载荷易于和采动应力相互影响,造成工作面覆岩和黄土层上坡段区域出现向采空区回转的趋势,导致综放工作面矿压显现异常剧烈;同时相似模拟结果量化了12309工作面基本顶初次破断步距为35m,周期来压步距介于23~34m。数值模拟分析了工作面覆岩塑性区演化规律,与相似模拟结果相互吻合。该研究结论可为相似条件下的工作面推进规划提供借鉴。Aiming at the strong underground pressure and abnormal pressure law in fully mechanized caving face under gully landforms,the advancing process of a mine 12309 working face through gully landforms is taken as the engineering background,and numerical simulation and similar simulation are used to analyze the overlying strata migration and fracture characteristics and the evolution of plastic zone during the advancement of the working face,and the influence mechanism of gully landform on the behavior of fully mechanized caving.The research results show that the breaking of the main key stratum will cause the separation between the bedrock and the loess stratum,and the fissure develops to the surface and form a crack.At this time,the uneven surface load of the gully landform is likely to interact with the mining stress,causing the upslope section of the overburden and loess stratum tend to turn to the goaf,resulting in abnormally violent mine pressure in the fully mechanized caving face;simultaneously,similar simulation results quantify that the first weighting interval of the basic roof of 12309 working face is 35 m,and the periodic weighting interval is 23~34 m.Evolution of the plastic zone of the overlying strata in the working face is analyzed by numerical simulation,which is consistent with similar simulation results.This research conclusion can provide a reference for advancement planning of working face under similar conditions.

关 键 词：沟壑地貌 综放开采 主关键层 覆岩破断特征 上覆岩层 

分 类 号：TD821[矿业工程—煤矿开采]