下伏采空区对建筑物的稳定性影响分析

Analysis on Influence of Underlying Goaf to Stability of Surface Buildings

由于地质条件限制和工程建设的需要,大斗沟矿新建通风机房下伏有采空区。为保障通风机房建筑物的安全运营,计算分析新建通风机房地基压缩层深度、地表裂缝带深度及采空区上覆岩层的破坏高度;同时,采用采深采厚比对采空区场地的稳定性进行分析;并分析了地表潜水与采空区水体的水力联系。结果表明:新建通风机房地表裂缝带深度、导水裂隙带高度及安全距离之和远小于采空区埋深,新建通风机房荷载不会对下伏采空区产生“活化”作用;采深采厚比计算结果满足稳定性要求;地下采空区对地面通风机房建筑物结构的安全,不会造成不利影响;地表潜水与采空区水体间不会发生明显的水力联系。在工程实践中,取得了较好的应用效果。

Due to the geological condition limit and the requirement of the engineering construction,the new ventilator house in Dadougou Coal Mine had a goaf underneath.In order to protect a safety operation of the ventilator house,a calculation and an analysis were conducted on the depth of compressed layer in the foundation,the depth of ground fissure and the failure height of the overburden strata above the goaf;meanwhile,an analysis was conducted on the ratio of mining depth and mining thickness affected to stability of the goaf ground.An analysis was conducted on the hydraulic relationship between the surface ground water and the water in the goaf.The results showed that:firstly,the sum of the depth of ground fissure,the height of water conducted zone and the safety distance under the house was far less than the burial depth of the goaf,so the load of the new ventilator house would not cause a “activation” role to the underlying goaf;secondly,the calculation results of the mining depth and mining thickness ratio could fully meet the requirements of the stability;thirdly,the underground goaf would not cause an unfavorable influence to the building structure of the ventilator house at the surface ground;fourthly,there was no obvious hydraulic relationship occurred between the surface phreatic water and the goaf water.A good application effect was obtained in the engineering practices.