软土地区逆作法地铁换乘车站基坑变形特性研究

罗智勇

PDF(533 KB)

铁道工程学报 ›› 2010, Vol. 27 ›› Issue (12) : 93-99.

路网研究

软土地区逆作法地铁换乘车站基坑变形特性研究

罗智勇

作者信息 +

Research on Deformation Characteristics of Foundation Pit of Metro Transfer Station Constructed in Soft Soil Area with Top—down Method

LUO Zhi—yong

Author information +

文章历史 +

摘要

研究目的：地铁嘉善路车站为上海市轨道交通9号线二期工程与12号线工程的换乘站，为地下三层岛式车站。场地浅层以淤泥质粉质黏土和淤泥质黏土为主。本文通过监测数据，分析了该换乘站逆作法施工过程中的连续墙侧向位移特性、墙顶沉降特性、立柱隆起特性以及周围地面沉降特性，探讨了其发展的规律，与已有研究成果进行了对比，得到一些有价值的结论。

研究结论：研究结果表明，软土地区地铁车站逆作法施工变形特性如下：(1)连续墙侧向位移特性呈中间大、两侧小的趋势，最大水平位移始终出现在距离开挖面上几米的位置。最大位移量和开挖深度的比值约为0．18％。(2)连续墙墙顶竖向变形均以沉降变形为主，且绝大部分沉降变形发生第二层土开挖结束以前，在这个阶段以后，墙顶竖向变形呈波动状态。(3)在基坑开挖过程中，基坑内土体以及立柱桩基均呈隆起趋势，在开挖初期隆起量较大。(4)土方开挖造成的地表沉降约为开挖深度日的0.13％。研究成果对于同类工程的设计、施工具有借鉴价值。

Abstract

Research purposes: Jiashan Metro Station is a underground triple—deck island—type transfer station between Line 9 and Line 12 of Shanghai metro．The shallow ground under the station is mainly composes of muddy silty clay and muddy clay．Based on the monitored data，this paper analyzes the lateral displacement characteristics of concrete diaphragm wall，the settlement characteristics of the wall top，the swell characteristics of post and the settlement characteristics of surrounding ground，discusses their development laws and compares these laws with the researched results to obtain some valuable conclusions．

Research conclusions:From the research the following settlement characteristics of the underground metro station constructed in soft soil area with top—down method are concluded：(1)The lateral displacement of the concrete diaphragm wall is big in the middle and small on the both ends．The maximum lateral displacement occurs in the area a few meters away from the excavation face．The ratio between the maximum lateral displacement of concrete diaphragm wall and excavation depth is about 0．1 8％．(2)The longitudinal displacement of the wall is mainly of settlement and the most settlements Occur before completion of excavating the second layer．After it the longitudinal displacement of the wall top is in fluctuation state．(3)The soil in the foundation pit and the pile foundation are in swen state during excavation of the foundation pit．，and the swell volume is big in the early—stage excavation．(4)The ground settlement caused by excavation of soil is about 0．13％of the excavation depth．This research achievement can provide the valuable reference to the similar works．

导出引用

罗智勇. 软土地区逆作法地铁换乘车站基坑变形特性研究[J]. 铁道工程学报, 2010, 27(12): 93-99

LUO Zhi—yong. Research on Deformation Characteristics of Foundation Pit of Metro Transfer Station Constructed in Soft Soil Area with Top—down Method[J]. Journal of Railway Engineering Society, 2010, 27(12): 93-99

中图分类号： U231+4

参考文献

[1] 徐中华．上海地区支护结构与主体地下结构相结合的深基坑变形性状研究[D]．上海：上海交通大学，2007．

Xu Zhoughua．Deformation Behavior of Deep Excavations Supported by Permanent Structure in Shanghai Soft Deposit[D]． Shanghai：Shanghai Jiaotong University. 2007．

[2]孙亮．地下连续墙的三维有限元分析[D]．广州：华南理工大学，2002．

Sun Liang．3D FE Analysis on Diaphragm Wall Underground[D]．Guangzhou：South China University of Technology，2002．

[3]戴标兵，范庆国，赵锡宏．深基坑工程逆作法的实测研究[J]．工业建筑，2005(9)：54—59．

Dai Biaobing，Fan Qingguo，Zhao Xihong．A Study on Monitoring of Up—down Construction for Deep Excavation Engineering[J]． Industrial Construction， 2005(9)：54-59．

[4]谢小松．大型深基坑逆作法施工关键技术研究及结构分析[D]．上海：同济大学，2007．

Xie Xiaosong． Research all Key Technique and Structure Analysis of Big & Deep Foundation Pit by Top—down Construction Method[D]．Shanghai： Tongji University，2007．

[5]任建喜，冯晓光，刘慧，等．地铁车站深基坑围护结构变形规律监测研究[J]．铁道工程学报，2009(3)：89—92．

Ren Jianxi，Feng Xiaoguang，Liu Hui，etc．Research on the Deformation Law of Supporting Structure for Deep Foundation Pit of Metro Station Metro[J]．Journal of Railway En西neering Society。2009(3)：89一92．

[6]任建喜，高涛．地铁换乘站深基坑围护结构变形规律 FLAC模拟研究[J]．铁道工程学报，2008(9)：80—83．

Ren Jianxi，Gao Tao．Research on the Deformation Law of Deep Excavation Supporting Structurein Metro Interchange Station by FLAC Simulation[J]．Journal of Railway Engineermg Society，2008(9)：80—93.

[7]齐如明．逆作法施工技术的设计与实践[D]．长春：吉林大学，2007．

Qi Ruming．Design & Practice of the Reverse Construction Method[D]．Changchun：Jilin University，2007．

[8]武朝军，陈锦剑，叶冠林，等．苏州地铁车站基坑变形特性分析[J]．岩土工程学报，2010(1)：458-462．

Wu Chaojan， Chen Jmjmn， Ye Guanlin，etc． Deformation Characteristics of Foundation nts of Subway Stations in Suzhou[J]．Chinese Journal of Geotechnical Engineering，2010(1)：458一462．

[9] 上海市隧道工程轨道交通设计研究院，上海轨道交通学科(专项技术)研究发展中心．DGJ 08一109—2004，城市轨道交通设计规范[s]．上海市工程建设规范．

Shanghai Tunnel Engineering Raft Transit Design and Research Institute，Shanghai Metro Research and Development Center．DGJ 08一109—2004．Urban rail Transit Design Standard[S]．Shanghai Engineering Construction Standard．

[10]上海市勘察设计协会．DBJ08—61—97，基坑工程设计规程[s]．上海市标准．

Shanghai Exploration and Design Trade Association． DBJ08—61—97. Code for Design of Excavation Engineering[S]．Shanghai Smndard．