察哈素煤矿3101工作面及地表漏风联合测试及其防治

Joint Test for Air Leakage of 3101 Working Face and Surface in Chahasu Coal Mine and Its Control

察哈素煤矿地表处于沟壑地区,所开采3-1煤层属于易自燃煤层。3101工作面开采过程中,由于矿山压力显现强烈,联巷密闭产生了一定程度的破坏,同时由开采活动在地表产生了比较大的裂缝,形成了密闭和地表漏风隐患,对工作面的安全开采形成了威胁。测试了3101工作面联巷密闭压差,根据风量测试结果计算出采空区漏风率。通过在地表裂缝释放SF6,检测到了地表漏风,并计算出了地表裂隙的最大漏风风速。分析了存在漏风的原因,通过采取减风减压、提高密闭质量、填补地表裂缝等措施,减少了采空区漏风,有效防治了采空区煤炭自燃。

The topography conditions of Chahasu Coal Mine belong to the gully area,the 3- 1 coal seam has the feature of easy spontaneous. During the mining in No. 3101 working face,the linked roadway sealing walls are damaged with a certain degree because of the strong mining pressure. Meanwhile,there are some large fractures on the surface produced by mining,and there is a serious air leakage hazard of sealing area and surface in the gob,which has the threat for safe mining in working face. The pressure differences between linked roadway sealing walls are measured in working face,and the air leakage ratio of the gob is obtained according to the test results.The tracer gas SF6 is used to find the air leakage on the surface and the maximum velocity of air leakage in surface fracture is calculated. The reasons of air leakage are analyzed. Finally,several measures are taken to reduce air leakage and prevent coal spontaneous combustion effectively in gob,such as reducing air quantity and pressure,improving the quality of sealing walls,filling the surface fractures,etc.