摘要
以长沙地铁二号线盾构机过某砂卵石地层段时开挖面失稳,出现地表塌陷为实例,针对埋深较浅、砂卵石层较厚的地质特点,采取地表注浆加固与盾构机内部处理相结合的方法,较好地起到了固岩、堵水、减少扰动的作用。同时,运用监控量测的手段,及时优化施工,使隧道通过坍陷地段,盾构机成功地从砂卵石地层中脱困。
Based on the engineering example of instability and surface subsidence occurred when Changsha subway tunnel shield machine passing the section of earth and sandy pebble,in light of the geological characteristics of shallow buried depth and thick sandy pebble layer,the methods of surface strengthening with grouting and internal shield machine processing are taken,which plays an effective role in reinforcing rock,stopping water,reducing disturbance.At the same time,the means of monitoring measurement are used to conduct timely construction optimization to ensure the construction through the subsidence area and successfully relieve the shield machine from the sandy pebble formation.
出处
《铁道建筑技术》
2012年第6期51-54,共4页
Railway Construction Technology
关键词
地铁隧道
盾构机
浅覆土
砂卵石
注浆加固
监控量测
subway tunnel
shield
lightly sandy
sandy pebble
grouting strengthening
monitoring measurement
