管廊基坑开挖对既有长江隧道变形的影响  

Influences of Foundation Pit Excavation for Comprehensive Pipe Gallery on the Deformation of Existing Yangtze River Tunnel

作　　者：杨卫星 官天培 刘长庚 卢方伟 王丹生[3] YANG Wei-xing;GUAN Tian-pei;LIU Chang-geng;LU Fang-wei;WANG Dan-sheng(Wuhan Municipal Engineering Design&Research Institute Co Ltd,Wuhan 430023,China;NR Electric Co Ltd,Nanjing 211102,China;School of Civil Engineering&Mechanics,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]武汉市政工程设计研究院有限责任公司,湖北武汉430023 [2]南京南瑞继保电气有限公司,江苏南京211102 [3]华中科技大学土木工程与力学学院,湖北武汉430074

出　　处：《土木工程与管理学报》2020年第2期87-92,共6页Journal of Civil Engineering and Management

基　　金：国家自然科学基金(51878314)。

摘　　要：本文以上穿武汉和平大道三角路既有长江隧道的综合管廊深基坑工程为研究背景,采用大型有限元软件ANSYS对上述穿越长江隧道的管廊基坑进行了数值建模,并利用基于Winkler弹性地基梁的理论模型结果对该数值模型进行了验证。随后对基坑开挖卸载后既有隧道竖向位移的变化规律进行了研究,详细讨论了加固土长度、加固土宽度以及加固土密度等因素对隧道竖向位移的影响规律。研究结果表明:基坑开挖完成后,下方既有隧道顶部竖向位移呈现中间大、两边小的规律;采用加固土控制隧道竖向位移时,增大加固厚度和密度比增大加固宽度更有效;增大加固土弹性模量,对隧道竖向位移影响较小。In this paper,based on the research background of the deep foundation pit project of the existing Yangtze River tunnel through the triangle road of Wuhan Heping Avenue,the large-scale finite element software ANSYS is used to carry out the numerical modeling of the foundation pit of the above tunnel,and the numerical model is verified by the theoretical model results based on the Winkler elastic foundation beam.Then,the changing rule of the existing tunnel vertical displacement after the excavation and unloading is studied.The influence rules of the length,width and density of the reinforced soil on the vertical displacement of the tunnel are also discussed in detail.The research results show that:after the excavation of foundation pit,the vertical displacement of the top of the existing tunnel below is large in the middle and small on both sides;when the reinforcement soil is used to control the vertical displacement of the tunnel,increasing the reinforcement thickness and density is more effective than increasing the reinforcement width;increasing the elastic modulus of the reinforcement soil has less impact on the vertical displacement of the tunnel.

关 键 词：深基坑开挖 长江隧道 综合管廊 竖向位移 加固土 

分 类 号：U456.3[建筑科学—桥梁与隧道工程]