超大直径土压平衡盾构施工对环境影响的现场监测研究  

Measurement and analysis of ground settlement due to EPB shield construction

作　　者：侯永茂[1,2] 郑宜枫[2] 杨国祥[2] 葛修润[1] 邱裕华[2] 

机构地区：[1]上海交通大学土木工程系,上海200240 [2]上海隧道工程股份有限公司,上海200082

出　　处：《岩土力学》2013年第1期235-242,共8页Rock and Soil Mechanics

基　　金：上海市博士后基金项目资助(No.11r21421200)

摘　　要：软土地层中盾构法隧道施工对周围环境影响的控制是施工中最为关心问题。依托上海迎宾三路14.27 m土压平衡盾构隧道工程,通过在试验段布设监测断面、调整施工参数,研究超大直径土压平衡盾构施工诱发的地表沉降分布和发展规律。通过分析发现,超大直径土压平衡盾构施工中土舱压力和同步注浆参数的设定决定了地表沉降的发展规律,其中同步注浆的参数设定对于控制地表沉降起关键作用。同步注浆填充效果不佳会导致盾尾上方较大范围内地表沉降发展明显,距离盾尾越近,沉降速率越大,而填充效果较好时,地表沉降可以得到有效控制,Peck公式比较适于盾尾间隙填充效果不佳的情况。另外,监测数据揭示,盾构停推过程中超孔隙水压力逐渐消散,地表沉降持续发展,距离盾尾越近的位置地表沉降发展速率越大。Controlling the impact on the environment is the key point for the earth pressure balance（EPB） shield construction.Based on the Yingbinsanlu tunnel project constructed by the 14.27 m earth pressure balance shield in Shanghai,field measurement is executed to study the development and distribution of the ground settlement and the relationship between the ground settlement and construction parameters.According to analyzing the measured data,it could be found that the underlying law of the ground settlement development is determined by the chamber pressure and synchronization grouting parameters.Bad filling effect of the synchronization grouting may lead to obvious development of ground surface settlement in a large region and the settlement rate of ground surface above the shield tail is maximum.Good filling effect of the synchronization grouting could effectively control the ground surface settlement.The Peck formula is suitable for the bad filling condition.In addition,measured data reveal that pore pressure would dissipate which leads to the gradually development of the ground surface settlement;and the settlement rate of ground surface above the shield tail is maximum during a long-time standstill of the EPB shield.

关 键 词：超大直径土压平衡盾构 地表沉降 施工参数 盾构停推 

分 类 号：TU447[建筑科学—岩土工程]