摘要
为研究盾构下穿施工影响下的既有高铁线路的沉降规律及控制沉降的盾构施工参数,结合黄泛区富水粉砂层地质条件下淮安地铁1号线淮安东站—盾构工作井区间土压平衡(EPB)盾构隧道下穿连镇高铁线路的施工参数和现场实测资料,分析盾构下穿施工中高铁路基及站台沉降的变化规律,探究盾构施工参数与地表沉降的关系。结果表明:站台区域的沉降槽呈V形,以隧道为轴线左右对称,左、右宽度均约为15 m;路基区域的沉降槽深、宽均较大于站台区域的沉降槽。穿越富水粉砂土为主的地层时,盾构通过测点期间的沉降量约占总沉降量的54%,盾尾过断面20 m后,沉降趋于稳定。对盾构施工参数的调控可有效控制因盾构下穿施工引起的地面沉降,在类似富水粉砂层地质条件和隧道埋深的情况下,本工程选用的施工参数可作为参考。
To study the settlement law of the existing high-speed railway under the influence of shield tunneling and the shield construction parameters of controlling the settlement,this paper combined the earth pressure balance(EPB)shield tunnel with the geological conditions of the water rich silty sand layer in the Yellow River flooding area of sections between Huai′an East Station and shield working shaft of Huai′an Metro Line One.Based on the construction parameters of EPB shield tunnel crossing underneath high-speed railway of connecting towns and the field settlement measurement data,the development trend of high-speed railway subgrade and platform settlement during shield tunneling were analyzed,and the relationship between shield construction parameters and surface settlement was also studied.Results showed that the settlement groove in the platform area was V-shaped,symmetrical to the left and right of the tunnel axis.The width was both about 15 m on the left and right.And the depth and width of the settlement groove in the subgrade area were larger than those in the platform area.When crossing underneath the stratum with water rich silty sand,the settlement during the shield crossing underneath the measuring point was 54%of the total settlement.The settlement tended to be stable after crossing the shield tail for 20 m.Through the adjustment and control of shield construction parameters,the ground settlement and deformation caused by shield tunneling could be effectively controlled.In the case of similar water rich silty sand and tunnel buried depth,the construction parameters selected for the project can be used as a reference.
作者
祝嘉辉
李俊才
朱正国
ZHU Jiahui;LI Juncai;ZHU Zhengguo(School of Transportation Engineering, Nanjing Tech University, Nanjing 211800, China;Huai′an Hi-tech Holding Co. Ltd., Huai′an 223001, China)
出处
《南京工业大学学报（自然科学版）》
CAS
北大核心
2021年第1期125-134,共10页
Journal of Nanjing Tech University(Natural Science Edition)
关键词
富水粉砂层
高铁路基及站台沉降
盾构施工参数
沉降规律
water rich silty sand layer
high-speed railway subgrade and platform settlement
shield construction parameters
settlement law
