桃树坪隧道深井降水技术

兰渝铁路桃树坪隧道在开挖过程中,出露的地层主要为第三系粉细砂岩和胶结松散的圆砾土,含有大量的地下水,由于这种特殊的地质条件致使隧道开挖时坍塌严重,钢架架设困难,支护段变形开裂时有发生,严重影响了施工安全和进度。针对这个问题,经过认真分析研究,先后采取了一系列的加强措施和辅助措施。在桃树坪隧道出口段,采取深井降水措施,有效改善了施工环境和施工条件。在此,对深井降水技术做一阐述,以期为今后类似工程提供借鉴。

Deep Well Water Drainage Technology for Taoshuping Tunnel

The excavation of Taoshuping Tunnel on Lanzhou-Chongqing Railway is done in the stratum of tertiary fine sandstone and loose gravel soil rich in underground water. Such geological condition leads to serious collapse, frequent supporting fracture and causes great difficulties to the installation of steel frame, which greatly interferes with the construction safety and progress. To solve the problems, a set of reinforcement measures and supporting methods are used. At the tunnel exit, deep well drainage was adopted, which effectively improves the construction conditions. These measures are discussed and explained here to provide reference for future construction.