CAJ | 학술논문

针对宣东煤矿坚硬覆岩顶板工作面动力灾害频发的问题，在已有成果的基础上，通过数值模拟对回采过程中顶板内部能量变化规律进行定量化研究，结果表明：采动影响前，煤层、直接顶和老顶的内部能量分别约为40 kJ、80 kJ和40 kJ ，能量主要集中于直接顶；煤层开采后，浅层直接顶内部能量释放，范围呈“椭圆形”，回采距离在80～120 m过程中，直接顶发生首次垮落，老顶能量开始增加；回采过程中，在超前支承压力的作用下，工作面前方2m左右浅层直接顶内部产生能量集聚现象，峰值能量随开采距离的增加呈线性增长，E＝0．6836△l＋91．245（R2＝0．9996）；随着监测层位的上升，上述增幅变缓，采空区跨度不变时，顶板岩体峰值能量随深度的增加呈三次函数降低。
침대선동매광견경복암정판공작면동력재해빈발적문제，재이유성과적기출상，통과수치모의대회채과정중정판내부능량변화규률진행정양화연구，결과표명：채동영향전，매층、직접정화로정적내부능량분별약위40 kJ、80 kJ화40 kJ ，능량주요집중우직접정；매층개채후，천층직접정내부능량석방，범위정“타원형”，회채거리재80～120 m과정중，직접정발생수차과락，로정능량개시증가；회채과정중，재초전지승압력적작용하，공작면전방2m좌우천층직접정내부산생능량집취현상，봉치능량수개채거리적증가정선성증장，E＝0．6836△l＋91．245（R2＝0．9996）；수착감측층위적상승，상술증폭변완，채공구과도불변시，정판암체봉치능량수심도적증가정삼차함수강저。
On the basis of the research achievements on dynamic disaster occurring frequently at working face with hard-overburden roof in Xuandong Colliery ,the authors make a quantitative research on the change law of in‐ternal energy in hard-overburden roof in the mining process ,w hich show s that the energy in coal seam ,imme‐diate roof and the old roof of are approximately 40 kJ ,80 kJ and 40 kJ respectively ,focused on the immediate roof before mining influence ;the energy in shallow immediate roof is released in the scope of an oval after mining with the first collapse of immediate roof occurred in the distance of mining of 80~120 m and the energy increase in the old roof ;the energy in the shallow rock of immediate roof appears agglomeration 2 m ahead of working face because of the abutment pressure during mining and the maximum energy linear increase along with coal mining distance increase ,which is expressed in the equation of ;the above growth becomes slow with the rise of the mo‐nitoring horizon and the energy of roof rock reduces in cubic function with depth increase when gob span remains unchanged .