近接建筑及桥梁地铁黄土暗挖隧道施工影响分析

Analysis on the Construction Influence of Subway Bored Tunnel in Loess Stratum on Adjacent Buildings and Bridges

黄土地层中暗挖隧道的施工会对近邻的建筑产生较大影响。采用三维数值模拟的方法,研究了暗挖隧道施工过程中支护结构力学特性演化特征,并分析了暗挖隧道施工对近邻建筑的影响规律。研究结果表明:施工结束后,由于既有建筑物的影响,左线隧道的变形及受力均大于右线隧道;隧道周围结构的变形主要为仰拱隆起、拱顶沉降,以及墙脚处向隧道内侧的挤出变形;拱顶与拱腰处的支护结构处于受拉状态,而拱脚处的支护结构处于受压状态;建筑楼房以及桥墩均在隧道开挖影响沉降槽范围内,根据周围建筑物的沉降值和倾斜值可知其处于轻微破坏等级,通过采取措施施工未对周边建筑的结构造成破坏。

The construction of the bored tunnel in loess stratum would have a great impact on the adjacent buildings.In this paper,the three-dimensional numerical simulation method is used to study the evolution characteristics of mechanical properties of support structure during the construction of underground tunnel,and the influence laws of underground tunnel construction on adjacent buildings are analyzed.The results show that after the construction,the deformation and stress of the left line tunnel are greater than that of the right line tunnel due to the influence of the existing buildings.The deformation of the surrounding structure of the tunnel mainly includes the uplift of the inverted arch,the settlement of the arch crown,and the extrusion deformation from the wall foot to the inside of the tunnel.The supporting structure at the arch crown and arch haunch is in tension,while the supporting structure at the arch foot is in compression.The buildings and piers are within the range of settlement trough affected by the tunnel excavation.According to the settlement value and inclination value of surrounding buildings,it can be seen that they are at the level of slight damage.The construction did not cause damage to the structure of surrounding building by taken strengthen measures.