地铁特殊地质黄土隧道施工技术

Construction Technology of the Loess Subway Tunnel in Special Geological Conditions

研究目的:通过对西安地铁黄土隧道施工采取的施工方法和措施及通过F3地裂缝穿越施工竖井出现涌水的处治,总结出一套合理、安全可行的施工处理方法,确保竖井和地铁隧道施工安全,为类似工程积累经验。研究结论:通过采用竖井外施做旋喷桩技术,使地下水和地裂缝涌水绕旋喷桩隔水帷幕外通过,同时采用竖井内注浆加固堵水、井内降水、分部开挖、向下外插花管注浆、竖井底混凝土封底,超前引排地下水及隧道内降水等措施,有效克服了黄土地区富水夹砂地层竖井和隧道施工涌水的难题。

Research purposes： Based on summing up the construction method and the measures used for the loess tunnel of Xihn subway tunnel and treatments of the water bursting when the shaft passing through the F3 ground fissures, this paper offers a set of reasonable, feasible and safe construction methods to ensure the safety of the shaft and tunnel construction for accumulating the experience to the similar projects. Research conclusions：Application of the churning jet pile outside the shaft makes the ground water and water bursting from the fissures going out from the outside of the water curtain of the churning jet pile. At the same time, by taking the measures of the grouting reinforcement in the shaf, the precipitation in shafts, the partial excavation, the grouting down outside shafts by the flower arrangement tubes, the back cover of concrete bottom of the shaft, the drainage of groundwater in advance and the precipitation inside the tunnel, the problems of the water bursting in construction of the shaft and tunnel in the water - enrich coarse strata of loess areas are overcome.