房式采空区集中煤柱诱发动载矿压机理及防治

发布时间：2019-02-15 09:41

【摘要】：针对神东矿区石圪台煤矿31201工作面出上覆房式采空区集中煤柱回采动载矿压问题,利用现场实测和理论分析方法,通过分析超前支承压力作用下小煤柱保持稳定时的临界弹性核宽度、动载荷作用下工作面覆岩结构及支架载荷,对动载矿压的发生机理及防治措施进行了研究。结果表明:出集中煤柱期间,下煤层工作面覆岩的回转运动使上覆集中煤柱支撑宽度减小,若超前支承压力导致该部分集中煤柱及前方大面积小煤柱失稳,超前失稳煤柱覆岩的运动将使工作面覆岩受到动载荷作用,破坏工作面覆岩承载结构的稳定性,从而诱发动载矿压;提出了提前爆破集中煤柱的防治措施,并确定了爆破时工作面与集中煤柱间应满足的安全距离,在现场应用效果显著。
[Abstract]:In view of the problem of mining load pressure in 31201 working face of Shigetai coal mine in Shendong mining area, using the method of field measurement and theoretical analysis, this paper deals with the problem of mining dynamic load of coal pillar in the overlying goaf type goaf. By analyzing the critical elastic core width of small coal pillar under the action of leading bearing pressure and the overburden structure and support load under dynamic load, the occurrence mechanism and prevention measures of dynamic bearing rock pressure are studied. The results show that the overburden movement of the lower coal face decreases the supporting width of the overlying coal pillar during the period of coal pillar exit, if the leading support pressure results in the instability of the partial concentrated coal pillar and the large area and small coal pillar in front of the coal face. The movement of coal pillar overburden in advance will cause the overburden to be subjected to dynamic load and destroy the stability of the bearing structure of the overburden in the working face, thus inducing the dynamic load rock pressure. The preventive measures of early blasting concentrated coal pillar are put forward, and the safety distance between the working face and the concentrated coal pillar is determined, and the application effect in the field is remarkable.
【作者单位】：煤炭科学技术研究院有限公司;煤炭科学研究总院煤炭资源高效开采与洁净利用国家重点实验室;
【基金】：国家自然科学基金面上资助项目(51174112);国家自然科学基金青年基金资助项目(51404140)
【分类号】：TD323

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