基于矿山法的城市隧道工程的施工力学行为分析

Analysis of Construction Mechanical Behavior of City Tunnel Project Based on Mine Tunnelling Method

矿山法俗称浅埋暗挖法,具有施工形式灵活多变,所需专用设备少,对地面交通及居民生活干扰少的优点,在城市隧道工程中应用广泛,并取得了极大的社会经济效益。近年来,在城市隧道工程中,山岭隧道建设极为普遍,主要采用新奥法理念进行钻爆法实现。这种模式会伴随一系列问题产生,对城市生活造成极大影响。为降低隧道施工风险,减少对城市地区的影响,以某隧道工程建设实践为例,采用非线性有限元软件ADINA,对基于矿山法的城市隧道工程的施工力学行为进行分析。实践证明:基于矿山法的城市隧道工程,位于洞口处的施工围岩,稳定性较好,隧道下穿既有建筑物时,注浆加固可降低最大沉降值,从而增加上部建筑物的安全系数。

Mine Tunnelling Method is also called shallow excavation method. Due to flexible, less equipment required for ground transportation and living less interference, mine tunnelling method is wide- ly used in urban tunnel project and makes great social and economic benefits. Nowadays, in the city tun- nel project ,the mountain tunnel construction is widespread, mainly to achieve through drilling and blas- ting method based on NATM method. This model will be accompanied by a series of problems, caused great impact on city life. To reduce the risk of tunnel construction, and reduce the impact on urban areas, the paper mainly to the construction of a tunnel as example, using nonlinear finite element software ADI- NA ,to analyze the construction mechanical behavior of city tunnel project based on mine tunnelling meth- od. The results show that：the portal construction of the wall rock tunnel project has good stability, wear tunnel under existing buildings, grouting can reduce the maximum settlement value, thereby increasing the upper part＇ s safety factor of the building.