深部黏土层对立井井筒周围地表长期沉降的贡献分析

Analysis on Deep Clay Stratum Contributed to Long-term Sedimentation of Surface Ground Along Mine Shaft Lining

为了分析深部黏土层对华东地区煤矿立井井筒周围地表长期沉降的贡献度,采用流固耦合有限元模拟方法,计算分析了华东地区孔庄煤矿主井井筒周围的地表长期沉降,通过对比近40 a的实测地表沉降数据与数值模拟计算结果,验证了模拟计算的合理性,模拟结果表明:深部黏土地层压缩变形在总沉降量中占比可达70~80%,而且可能存在的井筒破裂处新增失水通道能明显增大总的地层沉降。对整个运营期限内的立井井筒周围地表沉降进行了预测分析,结果显示,即使未来60 a含水层不再疏水,地表沉降量仍将持续发展,且其平均速率与前40 a相当。

In order to analyze the deep clay contributed to the long-term sedimentation of the surface ground along the mine shaft lining in East China Area,a fluid solid coupling finite element simulation method was applied to calculate and analyze the long-term sedimentation of the surface ground along the mine shaft lining in Kongzhuang Mine,East China Area.With a comparison between the actual measured surface ground sedimentation data and the numerical simulation calculation results nearly 40 years,the rationality of the simulation calculation was verified.The simulation results showed that the compression deformation of the deep clay stratum was taken 70~80 % of the total sedimentation and a water loss channel possibly occurred in the broken point of the mine shaft could obviously increase the total stratum sedimentation.A predicted analysis was conducted on the surface sedimentation along the mine shaft lining with the whole operation period.The results showed that even though no water drainage from the aquifer would conducted in the future 60 years,the surface ground sedimentation would be continuously developed and the average sedimentation rate would be close to the first 40 years.