论文模板-隧道建设.DOC

地铁隧道穿越地裂缝施工对既有桥梁影响分析 付黎龙1，胡海波2 (1.中铁隧道勘测设计院有限公司，天津 300133；2.湖南省长沙高速公路建设开发有限公司，长沙 410075) 摘要：以西安地铁二号线穿越长安立交和f6地裂缝段为例，利用ABAQUS有限元软件对地铁穿越地裂缝施工对既有桥梁建立三维模型进行模拟分析，并将现场监测数据与数值模拟结果进行对比分析，得出以下结论：1）地铁穿越地裂缝施工对既有桥梁桥墩具有一定的影响，对第3排桥墩沉降影响明显；2）地裂缝在短期内对地铁隧道开挖的影响不明显，需对地裂缝处结构进行长期监测。同时，建立了地铁隧道与地裂缝相距不同水平距离的二维模型，通过分析给出了在西安地区临近地裂缝开挖地铁隧道的建议最小设防距离为3倍隧道直径。 关键词：地铁隧道；地裂缝；既有桥梁；数值模拟 中图分类号: TU47 文献标识码：A 文章编号： Analysis on Influence on Existing Bridge Imposed by Construction of Metro Tunnel Crossing Ground Fissure FU Lilong1, HU Haibo2 (1. China Railway Tunnel Survey Design Institute Co., Ltd., Tianjin 300133, China; 2. Changsha Highway Construction and Development Co., Ltd. of Hunan Province, Changsha 410075, China) Abstract: 3D model is established and analysis is made on the influence on the existing bridge imposed by the construction of a subway tunnel crossing a ground fissure, and the site monitoring data and the simulation results are analyzed, with a section of Xi’an Metro line 2 crossing Chang’an Overpass and f6 ground fissure as an example. The conclusions drawn are as follow: 1) The construction of the Metro tunnel crossing the ground fissure has some influence on the existing bridge piers, especially on the settlement of the third row of the bridge piers; 2) The influence of the ground fissure on the excavation of the Metro tunnel in short term is not obvious, therefore long-term monitoring should be made for the tunnel structures near the ground fissure. Meanwhile, 2D model of different distances from the Metro tunnel to the ground fissure is established, analysis is made and the minimum fortification distance to excavate Metro tunnels near ground fissures in Xi’an area is proposed to be at least 3 times of the tunnel diameter. Key words: Metro tunnel; ground fissure; existing bridge; numerical simulation 0 引言 随着经济和社会的发展，我国也越来越重视地下铁道的发展，并在北京、广州、深圳、上海等大城市修建了大量地铁，南京、成都、杭州、西安、长沙等城市也在建或者筹建地铁。地铁是位于地下 的大型工程，由于受线路线型等因素的影响，因此地铁在修建过程中不可避免地会遭遇各种各样的地质问题，地裂缝就是其中之一。