盾构法隧道开挖面极限支护压力研究  

A study on the limit support pressure at excavation face of shield tunneling

作　　者：黄正荣[1] 朱伟[1] 梁精华[1] 秦建设[1] 

机构地区：[1]河海大学

出　　处：《土木工程学报》2006年第10期112-116,共5页China Civil Engineering Journal

摘　　要：盾构法隧道施工中,通过在开挖面施加与原始地应力相等的支护压力来预防开挖引起地层变位较大或开挖面失稳,但是由于地层条件和施工等因素的影响,使得开挖面支护压力的设定和控制较为困难,合理的确定开挖面支护压力是盾构掘进施工中一项关键技术,开挖面支护压力大小的控制应该保证不至于压力过低发生开挖面坍塌,同时又不能压力过大而发生隆起破坏,因此目前开挖面支护压力研究中很大部分研究侧重于开挖面极限支护压力的确定。随着计算机技术的发展,数值模拟计算可以模拟盾构法复杂的地下开挖施工过程。文章采用数值模拟方法,研究了地下水位和土层参数对开挖面极限支护压力的影响,给出了合理的开挖面支护压力,并结合一工程实例进行了分析,得出了一些有用的结论,对盾构法隧道施工中合理的确定支护压力的大小具有一定的指导作用。During the construction of shield tunnels, support pressure is usually applied at the work face to prevent excessive tunneling-induced soil movement or collapse. However, the selection and control of appropriate support pressure is difficult due to variation of soil conditions and uncertainty in construction. Support pressure should be controlled so that it is not so low as to cause face collapse and not so high as to induce ground hogging. Numerical simulation is employed to study how the soil parameter and ground water affect the support pressure, and to give the proper support pressure at the excavation face in a case study.

关 键 词：盾构隧道 开挖面 数值解 支护压力 

分 类 号：TU473[建筑科学—结构工程]