无煤柱切顶沿空留巷矿压显现规律

(1.西安科技大学 能源学院,陕西 西安 710054; 2.陕西煤业化工技术研究院有限责任公司,陕西 西安 710065)

无煤柱开采; 切顶沿空留巷; 矿压显现规律; 巷道变形; 巷道支护

Pressure behavior of gob-side entry retaining with roof cutting and non-pillar mining
ZHAO Meng-ye1,2,HUANG Qing-xiang1,HUANG Ke-jun2,XUE Wei-feng2,JI Rui-jun2

(1.College of Energy Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,China; 2.Shaanxi Coal and Chemical Technology Institute Co.,Lid.,Xi'an 710065,China)

non-pillar mining; roof cutting at gob-side entry retaining; mine pressure behavior; roadway deformation; roadway support

DOI: 10.13800/j.cnki.xakjdxxb.2019.0406

备注

为了掌握无煤柱切顶留巷的矿压显现规律并检验巷道支护效果,以澄合矿区董东煤矿50107工作面为研究对象,采用现场监测的手段对无煤柱切顶沿空留巷受采动影响条件下的顶板下沉规律、帮部变形规律及单体支柱受力变化规律进行了实测,并同时对切顶效果、挡矸效果及巷道稳定性进行了分析与评价。结果 表明,巷道矿压随工作面的临近而逐渐增大,采动过程中靠近采空区侧的巷道矿压显现程度更为剧烈,表现出明显的非对称性特征,巷道顶板的回转运动是造成巷道非对称矿压显现的主要原因。此外,无煤柱切顶沿空留巷阶段性变化特征明显,初始变化阶段位于工作面后方0~35 m; 快速变形阶段位于工作面后方35~75 m; 缓慢变形阶段位于工作面后75 m以外,巷道变形及支柱受力均达到稳定状态。巷道矿压显现的主要过程集中在快速变形阶段,需加强对巷道围岩的控制。实践表明,无煤柱切顶沿空留巷采用锚网配合单体支柱的支护方式可行。

To explore the pressure behavior and to test the supporting effect of gob-side entry retaining with roof cutting and non-pillar mining, a variety of on-site monitoring techniques are used to test the law of roof subsidence, rib deformation and stress of the single prop with the working face 50107 from Dongdong coal mine in Chenghe mining area as the subject, a variety of analysis and an evaluation have been made of the effects of roof cutting and tamping as well as roadway stability in this paper. The research results show that the pressure of roadway gradually increases with the approaching of the working face. Meanwhile, the pressure in the roadway near the side of the goaf is more intense during the mining process with significant asymmetry demonstrated. The rotation of the roof is the main reason for the apparent mine pressure of the roadway. In addition, the changes are obvious in different stages of the pressure of the coal roadway. The initial change stage is located at 0~35 m behind the working face.Rapid deformation mainly occurs 35~75 m behind the working face; Slow deformation stage is located at 75 m behind the working surface, the roadway is rapidly reduced and tends to be stable. The main process of roadway pressure is concentrated at the stage of rapid deformation, and it is necessary to strengthen the control of surrounding rock of roadway. Practice has proved the feasibility of the anchor net and the support of the single props in the roof.