摘要
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。
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 .
出处
《江西煤炭科技》
2015年第3期62-65,共4页
Jiangxi Coal Science & Technology
基金
国家级大学生创新创业训练计划项目:煤矿巷道顶板冒落破坏机理及稳定性控制(201310290014)
