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残留煤柱综合机械化固体充填复采采场稳定性分析

ISSN号：1673-3363
期刊名称：采矿与安全工程学报
时间：2011.12.12
页码：499-504+510
分类：TD823[矿业工程—煤矿开采;矿业工程—矿山开采]
作者机构：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221008
相关基金：教育部新世纪优秀人才支持计划项目（NCET-08-0837）;国家重点基础研究发展计划（973）项目（2007cB209400）;国家自然科学基金重点项目（50834005）;国家自然科学基金项目（51074163）;江苏省自然科学基金项目（BK2009092）;江苏省“青蓝工程”项目;深部岩土力学与地下工程国家重点实验室专项基金项目
相关项目：深井大采高矸石充填综采沿空留巷变形机理及控制

关键词：煤柱, 采空区, 采场稳定性, 固体充填复采, coal pillar, goafing, stope stability, repeated mining with solid filling

中文摘要：

利用传统房柱式或短壁方法开采的矿区，采空区遗留大量呆滞煤炭资源，同时煤炭开采还向地面排放大量固体废弃物，造成环境污染和占用土地等危害，开发老采空区残留煤柱综合机械化固体充填复采技术是解决上述问题的主要途径之一．以房柱式充填采矿方法为背景，建立了表征采空区内矿柱和充填物支撑顶板的弹性板柱力学模型，研究顶板不同阶段下沉的力学过程．通过数值计算从能量观点对充填采场的矿压显现规律、煤柱受力及其破坏特点进行了探讨．研究表明：当煤柱的有效承载面积逐渐减小时，单一煤柱的失效将使栽荷转移到邻近煤柱上并引起相邻煤柱过载，房柱式充填开采不存在直接顶及基本顸周期来压现象，煤柱内部应力受回收顺序影响较小．采场最大下沉值减少了30％～609／6，充填后最大能量密度值是未充填情况下的0．86倍．

英文摘要：

In the mining areas which used traditional room and pillar or short-wall mining methods, lots of coal resources were left underground, and large of solid wastes caused by coal mining were pulled to surface, which resulted in some harmfulness, such as environment pollution, land occupation, et al. So, the development of repeated mining with fully-mechanized waste-filling technology in residual coal pillar area is one of the main ways to resolve the problems mentioned above. Based on the roof and pillar filling mining method, we established a mechanical model of elastic pillar to simulate the coal pillar and backfilling in goafing for roof sup- porting, and studied the mechanical process of roof subsidence in different stages. Moreover, from the viewpoint of energy, we analyzed the strata-pressure behaviors, loads in coal pillars and their destruction features in the backfilling stope by numerical simulation. The results shows that when the effective bearing area of the pillar decreases gradually, the failure of single pillar will make its load transfer to the adjacent pillars and cause the pillars to be overload. The periodic weightings of immediate and main roof don＇t exist obviously in the room and pillar backfilling mining process, and the recovery sequence has little influence on the internal stresses in coal pillars. The maximal subsidence of the stope can be reduced by 30%to 60%, and the maximal energy density after filling is about 86% of that in non-filling.

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