Shandong Energy Zibo Mining Group Corporation Limited Shandong Provincial Research Center of Backill Mining
Engineering and Technology Postdoctoral Research Station,Zibo Mining Group Corporation Limited School of
Mines,China University of Mining and Technology

为了研究充实率对采场覆岩运动规律的影响,以岱庄矿为工程背景,首先对充填体特性进行了测试,然后利用Midas/GTS-FLAC3D耦合模拟技术构建了2351工作面膏体充填开采的数值分析模型,模拟研究了采场在充实率为0、80%、85%、90%、95%、100%时的矿压显现规律。结果表明:充填体能有效抑制采场覆岩的移动和变形,充填采场的覆岩一般只出现裂隙带和弯曲下沉带;充实率越高,支承压力同比越小,前方煤体和后方充填体的峰值应力位置距离工作面越近;当采场充实率为100%时,与非充填开采相比,采场塑性区宽度约为原来的5%,支承压力为原来的50%以下。可见,采场覆岩运动的充实效应非常显著,工程实际中应尽可能地使采场充填接顶,以保证充填质量和开采安全。

In order to study a full backfilled rate affected to the overburden strata movement law of the coal mining face,based on Daizhuang Mine as the engineeri ng background,a test was firstly conducted on the backfill material features.Then the Midas/GTS-FLAC~(3D) coupling simulation technology was applied to establish th e numerical analysis model of the paste backill mining in No.2351 coal miming face and to simulate and study the mine strata behavior when the full backfilled rate of t he coal mining face was 0、80%、85%、90%、95% and 100%.The results showed that the backfill body could effectively restrain the movement and deformation of the overburden strata above the coal mining face.The overburden strata above the backfilled coal mining face would generally cause the cracking zone and the bending su bsidence zone.The higher backill rate, the lower support pressure would be and the peak stress location of the front coal body and the backfill body behind would be mo re closed to the coal mining face.When the backill rate of the coal mining face was 100%,in comparison with the non backfill mining,the plastic zone width of the coal m ining face would be 5% of the previous width and the support pressure would be below 50% of the previous pressure. Therefore,the backfilled effect of the overburden st rata above the coal mining face was obvious and the coal mining face should be possibly backilled to the roof in the engineering practices to ensure the backfill quality and the mining safety. .

国家自然科学基金资助项目(51474209)；山东省泰山学者专项经费资助项目(201309)；