老采空区上方拟建高层建筑物稳定性评估

Stability evaluation of proposed high-rise buildings above old gobs

针对老采空区建设高层建筑物稳定性差的难题,利用理论分析和数值模拟对老采空区拟建高层建筑物稳定性进行评估,得出9#煤层垮落带最大高度为12.4m,导水裂缝带高度为54.4m。10-2#煤层垮落带最大高度为9.2m,导水裂缝带高度为35m。高层建筑物建成后会造成9#煤层采空区二次活化,10-2#煤层采空区也会受到叠加活化效应的影响;待建立18F高层建筑物后,地表发生二次沉降,地基下沉最大值为56.5mm;9#煤层、10-2#煤层采空区注浆充填后,地表沉降减小至6.58mm左右,表明采用地面预注浆工艺能够保证18F高层建筑物的稳定。

Aiming at the poor stability of high-rise buildings above old gobs, the stability evaluation of proposed high rise buildings above old gobs was studied by theoretical analysis and numerical simulation, which concluded that the maximum height of caving zone and water flowing fractured zone of No. 9 coal seam were 12.4 m and 54.4 m respectively, while that of No. 10 2 coal seam were 9.2 m and 35 m respectively. The gobs of No. 9 coal seam would reactivate after the completion of high rise build ings, so that the gobs of No. 10-2 coal seam would be affected by superposition activation~ the ground secondary setdernent would be observed, and the foundation＇s maximum subsidence was 56.5 mm; after grouting in gobs of No. 9 coal seam and No. 10-2 coal seam, the maximum subsidence of foundation reduced to 6.58 mm. The results showed that ground pre grouting technique could ensure the stability of the 18F high-rise buildings.