某煤矿采空区安全廊道稳定性分析

Stability Analysis of Safety Corridor in Goafs of a Coal Mine

某规划城际铁路需穿越河南省西北部广泛分布的煤炭矿区,该区域煤层具有埋藏深度大、可采层数多等特点。为减少占压煤炭资源和保证铁路的安全运行,结合区域工程地质条件、煤矿开采情况,采用概率积分法预计模型对两个采空区间安全廊道进行稳定性分析。受断层的抑制作用,安全廊道地表变形呈现出两侧大、中间小形态。其中,两条断层所夹的区域西侧的最大变形量达到了400 mm,东侧的最大变形量为40 mm,中间区域的变形量较小,一般为2~20 mm。综合考虑煤层厚度、埋深、开采方式、形成时间等多种因素的影响,可将评估场地分为稳定区、基本稳定区和不稳定区。研究表明,在现状条件下,安全廊道多属基本稳定场地,在采取适当措施后,可以进行铁路建设。

A planned intercity railway needs to cross the coal mining areas which are widely distributed in the northwest of Henan Province. The coal seams in this area are characterized by large burial depth and many minable layers. In order to reduce the occupation of coal resources and ensure the safe operation of the railway,the probability integral method prediction model is used to analyze the stability of the safety corridor between the two goafs combined with the regional engineering geological conditions and coal mining conditions.Due to the inhibition of faults,the surface deformation of the safety corridor appears to be large on both sides and small in the middle. Among them,the maximum deformation on the west side of the area sandwiched by the two faults is 400 mm,the maximum deformation on the east side is 40 mm,and the deformation in the middle area is small,generally 2-20 mm. The evaluation site can be divided into stable area,basically stable area and unstable area by considering the influence of various factors such as coal seam thickness,buried depth,mining method and formation time. The research shows that under the current conditions,the safety corridors are mostly basically stable sites,and the railway construction can be carried out after appropriate measures are taken.