某双孔隧道穿越路基暗挖试验研究总结

A Summary on Experiment of Excavation of Twin Tunnels with Large Sections Passing through Subgrade

本文主要阐述在北京通惠河南岸污水干线工程70 #—71 #穿越京包铁路高填土路基段 ,暗挖双孔大断面并联拱型排水隧道试验研究中 ,采用以“浅埋暗挖”为主要工法 ,并辅以管井、砂井组合降水 ,铁路路轨“五扣三束吊轨梁”、钢管棚以及小导管超前注浆加固等重要辅助工法和抑制铁路路基 (路堤 )沉降技术措施 ,成功地解决了在高填土铁路路基下暗挖大断面排水隧道的技术难题 ,获得北京市1998年科技进步二等奖 。

In this paper the experimental excavation of twin arched drainage tunnels with largesections was described.These tunnels passed through subgrade of Beijing_Baotou railway and were the main drainage projects on the south bank of Tonghui River,Beijing.The technololy applied was mainly the “shallow embedment with underground excavation” associated with shaft and sand wells for lowering water table.There were also the steel tube support,consolidation by grouting through small pipes for preventing the settlement of subfrade for the railway applied.Thus the problems of excavation of drainage tunnel under the subgrade of railway were solved.It can serve as reference to the similar projects in the future.