基于改进随机介质理论的地铁盾构施工地表变形空间分布特征分析  

Analysis of Surface Deformation Caused by Shield Tunnel Construction Based on the Improved Stochastic Medium Theory

作　　者：周诚[1] 余群舟[1] 

机构地区：[1]华中科技大学土木学院工程管理研究所,湖北武汉430074

出　　处：《施工技术》2016年第21期127-133,共7页Construction Technology

基　　金：国家自然科学基金(51408245);"十二五"国家科技支撑计划课题(2012BAK24B01);高等学校博士学科点专项科研基金(20100142110061)

摘　　要：以武汉地铁2号线越江盾构隧道实际工程为背景,根据盾构施工引起地表变形的产生机理,通过对传统随机介质理论中的土体移动模型、挤土效应模型等系统误差的改进,分别给出了盾构隧道横断面和纵断面最终地表变形的空间分布计算公式。基于MAMPSO算法,将空间分布特征参数作为待求未知量,根据现场实际测量数据,基于最小二乘原理建立目标函数关系式,寻找目标函数的最小值进行求解,通过反演结果分析了空间分布特征参数的合理性、工程意义和变化规律。According to the mechanism of ground deformation induced by shield construction, this paper offered the new formula for the spatial distribution of surface deformation of the shield tunnel crosssectional and longitudinal by improving the system error of ground movement model, soil compaction effect model in the traditional stochastic medium theory in Wuhan Metro Line II Yangzi river-crossing shield tunnel construction. Treating the main influence angle β and the ground loss parameters g as unknown quantities, this paper found the minimum value of objective function based on MAMPSO algorithm, field data and method of least squares, then analyzed the characteristics of spatial distribution parameters that are reasonable, engineering significance and changes by the inversion results.

关 键 词：隧道工程 盾构 变形 空间分布 MAMPSO算法 

分 类 号：U451[建筑科学—桥梁与隧道工程]