大直径泥水盾构穿越无加固条件沉降敏感带扰动控制技术研究
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摘要
随着盾构技术的快速发展,越来越多的盾构隧道穿越敏感环境,由于盾构隧道施工条件复杂,施工过程中难免会产生地层扰动,从而导致地表产生沉降,严重的还会造成周边建(构)筑物破坏。因此,地铁隧道在穿越高密集棚户区等沉降敏感区时,有效控制施工沉降尤其重要。以武汉地铁8号线一期工程,黄浦路站—徐家棚站区间盾构下穿高密度棚户区项目为工程依托,对施工过程中超大直径泥水盾构穿越无加固条件沉降敏感带扰动控制技术进行研究,在简要分析工程背景及重难点基础上,通过对掘进参数的优化,掘进前建筑物评估及试掘进等过程时时监控,做到施工过程中切口水压力、掘进速度、刀盘扭矩等的精细调控;泥膜控制、二次注浆等关键技术的实施,确保了掘进顺利进行,掘进过程参数控制可为分析大直径盾构下穿老旧棚户区施工控制提供参考和依据。
With the rapid development of shield technology,more and more shield tunnels pass through sensitive environments. Due to the complicated construction conditions of shield tunnels,stratum disturbances will inevitably occur during the construction process,resulting in settlement on the surface and serious damage to surrounding buildings.Therefore,it is especially important to control the construction settlement effectively when the subway tunnel passes through settlement sensitive areas such as high-density shantytowns. The project of Wuhan Metro Line 8 project,Huangpu Road Station to Xujiapeng Station tunneling through high-density shantytown project was taken as the project support.The perturbation control technology of super-large diameter mudwater shield in the construction process was studied. On the basis of a brief analysis of the engineering background and the difficulties,the article optimizes the excavation parameters,including the pre-excavation building evaluation and the excavation process,so as to achieve the final adjustment of the cutting water pressure,the excavation speed and the cutter head torque during the construction process. The implementation of key technologies such as mud membrane control and secondary grouting ensured the smooth progress of excavation. The parameter control of excavation process provides reference and basis for analyzing the construction control of large-diameter shields under the old shantytown.
With the rapid development of shield technology,more and more shield tunnels pass through sensitive environments. Due to the complicated construction conditions of shield tunnels,stratum disturbances will inevitably occur during the construction process,resulting in settlement on the surface and serious damage to surrounding buildings.Therefore,it is especially important to control the construction settlement effectively when the subway tunnel passes through settlement sensitive areas such as high-density shantytowns. The project of Wuhan Metro Line 8 project,Huangpu Road Station to Xujiapeng Station tunneling through high-density shantytown project was taken as the project support.The perturbation control technology of super-large diameter mudwater shield in the construction process was studied. On the basis of a brief analysis of the engineering background and the difficulties,the article optimizes the excavation parameters,including the pre-excavation building evaluation and the excavation process,so as to achieve the final adjustment of the cutting water pressure,the excavation speed and the cutter head torque during the construction process. The implementation of key technologies such as mud membrane control and secondary grouting ensured the smooth progress of excavation. The parameter control of excavation process provides reference and basis for analyzing the construction control of large-diameter shields under the old shantytown.
引文
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[11]赵杨中.隧道复合地层的盾构掘进技术探讨[J].科技创业家,2013(18):22.ZHAO Yangzhong.Discussion on shield digging in tunnel composite stratigraphy[J].Technological Pioneers,2013(18):22.
[12]张恒.下穿立交桥盾构隧道掘进控制技术研究[D].西安:西南交通大学,2009.ZHANG Heng.Study on the control technology of tunneling in underpass overpass shield tunnel[D].Xi'an:Southwest Jiaotong University,2009.
[2]BAI Yun,YANG Zhang,JIANG Zhiwei.Key protection techniques adopted and analysis of influence on adjacent buildings due to the Bund Tunnel construction[J].Tunnelling and Underground Space Technology,2014,41(2):24-34.
[3]陈自海,陈建军,杨建辉.基于模糊层次分析法的盾构隧道施工风险分析[J].地下空间与工程学报,2013,9(6):1427-1432,1464.CHEN Zihai,CHEN Jianjun,YANG Jianhui.Analysis of construction risk of shield tunnel based on fuzzy analytic hierarchy process[J].Chinese Journal of Underground Space and Engineering,2013,9(6):1427-1432,1464.
[4]SHIRLAW J N.Observed and calculated pore pressure and deformations induced by an earth balance shield:discussion[J].Canadian Geotechnical Journal,2001,32(30):476-490.
[5]IMAMURA S,HAGIWARA Tai.Settlement trough above a model shield observed in a centrifuge[C]//Proceeding of the International Conference CENTRIFUGE98.Tokyo,Japan:AA Balkema,1998:713-719.
[6]庄丽,张银屏.软土地层盾构隧道渗漏水量与沉降关系的模拟分析[J].中国建筑防水,2006(6):13-15.ZHUANG Li,ZHANG Yinping.Simulation analysis on the relationship between seepage water quantity and settlement of shield tunnel in soft ground[J].China Construction Waterproofing,2006(6):13-15.
[7]张金菊.盾构施工引起土体变形分析研究[D].杭州:浙江大学,2006.ZHANG Jinju.Analysis of soil deformation induced by shield construction[D].Hangzhou:Zhejiang University,2006.
[8]易宏伟,孙钧.盾构施工对软粘土的扰动机理分析[J].同济大学学报,2000,28(3):277-281.YI Hongwei,SUN Jun.Mechanism of shield construction disturbance to soft clay[J].Journal of Tongji University,2000,28(3):277-281.
[9]刘招伟,王梦恕,董新平.地铁隧道盾构法施工引起的地表沉降分析[J].岩石力学与工程学报,2003,22(8):1297-1301.LIU Zhaowei,WANG Mengshu,DONG Xinping.Surface subsidence analysis caused by construction of metro tunnel shield method[J].Chinese Journal of Rock Me-檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪chanics and Engineering,2003,22(8):1297-1301.
[10]王阳.大型越江盾构隧道工程项目的风险管理研究[D].上海:上海交通大学,2009.WANG Yang.A study of risk management for largescale cross-river shield tunnel projects[D].Shanghai:Shanghai Jiaotong University,2009.
[11]赵杨中.隧道复合地层的盾构掘进技术探讨[J].科技创业家,2013(18):22.ZHAO Yangzhong.Discussion on shield digging in tunnel composite stratigraphy[J].Technological Pioneers,2013(18):22.
[12]张恒.下穿立交桥盾构隧道掘进控制技术研究[D].西安:西南交通大学,2009.ZHANG Heng.Study on the control technology of tunneling in underpass overpass shield tunnel[D].Xi'an:Southwest Jiaotong University,2009.