暗挖大断面区间隧道下穿既有结构沉降控制研究

Study on the Settlement Control Measures of Underground Large Section Tunnel under Existing Structures

以石家庄地铁1号线工程留村站-火炬广场站区间隧道下穿地下过街通道为背景,针对施工中地下过街通道沉降变形以及地表沉降规律,进行数值模拟、现场监测两者结合研究。研究结果表明:在双侧壁导坑法(六导洞)施工的不同阶段,地层变形量存在很大差异,拆除下部临时支撑及形成最终封闭二衬两个阶段的地下过街通道下沉量占地下过街通道最大下沉量的79%;选择深孔注浆结合径向注浆等加固措施,结合双侧壁导坑法(六导洞)能够保证隧道上方建构筑物的安全。

Taking Shijiazhuang Metro Line 1 station torch~Liu Cun square station tunnel through the underpass as the background,according to the construction of the settlement deformation,plastic zone development and surface subsidence rule,the research work carried out numerical simulation and field monitoring combination.:.The results show that:in the different stages of the bilateral wall of the 6 heading construction,strata deformation there is a big difference,and the lower part of the formation of the final removal of temporary support closed two lining underpass two stages of subsidence of underpass accounted for maximum settlement of 79%;by deep hole grouting combined with radial grouting and other reinforcement measures,combined with bilateral heading method(six holes)can ensure the safety of the building above the tunnel.