多层坚硬顶板综放开采矿压规律及控制技术研究

发布时间：2018-07-03 05:22

本文选题：特厚煤层 + 多层坚硬顶板　；参考：《煤炭科学技术》2017年07期

【摘要】：针对特厚煤层和多层坚硬顶板赋存条件下,工作面易出现液压支架压死、煤壁片帮和沿空巷道围岩变形严重、矿压显现强烈的问题,以同忻煤矿特厚煤层综放工作面为工程背景,对回采巷道和工作面进行矿压显现监测,分析多层坚硬顶板作用下的围岩应力和变形规律。研究表明:工作面开采引起的采动应力影响范围较大,多层坚硬顶板作用下覆岩形成了大结构,在其作用下围岩应力和变形表现为"上升突变"和"下降突变"交替出现。研究结果说明了特厚煤层大采出空间和多层坚硬顶板的共同作用是综放工作面强烈矿压显现的主要原因,据此提出了坚硬预裂爆破切顶和沿空巷道恒阻大变形锚杆吸能支护控制技术,可对强矿压进行有效防治。
[Abstract]:Under the condition of thick coal seam and multi-layer hard roof, the hydraulic support is easy to die in the working face, the wall and the surrounding rock of the roadway along the goaf are deformed seriously, and the rock pressure appears to be very strong. Taking fully mechanized top-coal caving face of extra thick seam in Tongxin Coal Mine as the engineering background, the rock pressure behavior of roadway and working face is monitored, and the stress and deformation of surrounding rock under the action of multi-layer hard roof are analyzed. The study shows that the mining stress caused by the mining face has a large scope of influence, the overburden rock under the action of multi-layer hard roof forms a large structure, and the stress and deformation of surrounding rock appear alternately as "rising abrupt change" and "descending sudden change" under its action. The results show that the common action of large mining space and multi-layer hard roof in super thick coal seam is the main reason of strong mine pressure in fully mechanized caving face. Based on this, the energy absorption control technology of roof cutting by hard pre-splitting blasting and roadway with constant resistance and large deformation along goaf is put forward, which can effectively prevent and cure strong rock pressure.
【作者单位】：辽宁工程技术大学矿业学院;铁法能源有限责任公司小青煤矿;
【基金】：国家自然科学基金资助项目(51674135,51604139)
【分类号】：TD327.2

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