城市轨道交通车站出入口大断面顶管工程穿越城市道路的沉降控制技术

U231.4%U215.8; [目的]为了确保城市轨道交通车站出入口顶管施工项目顺利实施,应对该工程穿越城市道路时地层的沉降影响及沉降控制措施进行研究.[方法]结合济南轨道交通R2线长途汽车站站出入口顶管工程,在阐述该工程地质条件及重难点的基础上,建立了大断面顶管工程穿越地下管线密集的城市道路的三维数值计算模型,得到了距开挖面不同距离时的地面沉降曲线,以及不同埋深处土层的沉降曲线.对比了顶管中轴线上方地面监测点竖向位移模拟计算值与现场实测值随开挖距离的变化情况.提出相应的施工优化措施,并结合现场实测数据对优化效果进行分析验证.[结果及结论]顶管施工时,随着与顶管中轴线距离的增大,地面沉降量逐渐...

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Published in城市轨道交通研究 Vol. 27; no. 4; pp. 177 - 185
Main Authors 邢慧堂, 刘浩, 王栋, 李鹏飞, 周华, 张炎
Format Journal Article
LanguageChinese
Published 济南轨道交通集团有限公司,250014,济南%河海大学土木与交通学院,210098,南京%中铁二十一局集团轨道交通工程有限公司,250117,济南 2024
Subjects
城市轨道交通出入口
under-passing construction
沉降控制
pipe jacking tunnel construction
FLAC 3D软件
urban rail transit entry/exit
FLAC 3D software
settlement control
顶管隧道施工
下穿施工
Online AccessGet full text
ISSN1007-869X
DOI10.16037/j.1007-869x.2024.04.033

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Abstract U231.4%U215.8; [目的]为了确保城市轨道交通车站出入口顶管施工项目顺利实施,应对该工程穿越城市道路时地层的沉降影响及沉降控制措施进行研究.[方法]结合济南轨道交通R2线长途汽车站站出入口顶管工程,在阐述该工程地质条件及重难点的基础上,建立了大断面顶管工程穿越地下管线密集的城市道路的三维数值计算模型,得到了距开挖面不同距离时的地面沉降曲线,以及不同埋深处土层的沉降曲线.对比了顶管中轴线上方地面监测点竖向位移模拟计算值与现场实测值随开挖距离的变化情况.提出相应的施工优化措施,并结合现场实测数据对优化效果进行分析验证.[结果及结论]顶管施工时,随着与顶管中轴线距离的增大,地面沉降量逐渐减小;随着深度的增加,土层深层位移逐渐增大,且沉降曲线逐渐由"矮胖型"变成"瘦高型".现场受土舱压力波动较大、顶管与地层存在摩擦扰动等因素的影响,模拟计算得到的最大沉降量略小于现场实测的最大沉降量,二者间存在一定差异.通过采取控制掘进速度、合理压浆以减少摩阻力等措施后,后续施工沉降控制效果明显,地面最大沉降为18.18 mm,变形在施工允许范围内.
AbstractList U231.4%U215.8; [目的]为了确保城市轨道交通车站出入口顶管施工项目顺利实施,应对该工程穿越城市道路时地层的沉降影响及沉降控制措施进行研究.[方法]结合济南轨道交通R2线长途汽车站站出入口顶管工程,在阐述该工程地质条件及重难点的基础上,建立了大断面顶管工程穿越地下管线密集的城市道路的三维数值计算模型,得到了距开挖面不同距离时的地面沉降曲线,以及不同埋深处土层的沉降曲线.对比了顶管中轴线上方地面监测点竖向位移模拟计算值与现场实测值随开挖距离的变化情况.提出相应的施工优化措施,并结合现场实测数据对优化效果进行分析验证.[结果及结论]顶管施工时,随着与顶管中轴线距离的增大,地面沉降量逐渐减小;随着深度的增加,土层深层位移逐渐增大,且沉降曲线逐渐由"矮胖型"变成"瘦高型".现场受土舱压力波动较大、顶管与地层存在摩擦扰动等因素的影响,模拟计算得到的最大沉降量略小于现场实测的最大沉降量,二者间存在一定差异.通过采取控制掘进速度、合理压浆以减少摩阻力等措施后,后续施工沉降控制效果明显,地面最大沉降为18.18 mm,变形在施工允许范围内.
Abstract_FL [Objective]To ensure the smooth implementation of urban rail transit station entry/exit pipe jacking construction project,it is essential to study the impact of ground settlement and explore settlement control measures for its engineering through urban roads.[Method]With reference to the long-distance bus station entry/exit pipe jacking engineering on Ji-nan Rail Transit R2 Line,and based on the description of pro-ject geological conditions and key difficulties,a 3D numerical calculation model for large profile pipe jacking engineering through urban roads with dense underground pipelines is estab-lished.Land subsidence curves at different distances from the excavation face and settlement curves at different depths of the soil layer are obtained.A comparison is made between the sim-ulated vertical displacement values of land monitoring points a-bove the pipe central axis and the field-measured values chan-ging with excavation distances.Corresponding construction op-timization measures are proposed,and the optimization effects are analyzed and verified based on field-measured data.[Re-sult & Conclusion]During the jacking process,as the dis-tance from pipe central axis increases,the land subsidence gradually decreases.With increasing depth,the deep layer dis-placement of the soil layer gradually increases,and the settle-ment curve gradually transitions from'stout and short'to'slen-der and tall'.Factors such as significant fluctuations in soil chamber pressure and frictional disturbance between the pipe and the stratum on-site lead to an outcome of the maximum simulated settlement,which is slightly less than the maximum field-measured settlement,posing certain discrepancy.By a-dopting measures such as controlling excavation speed and ra-tional grouting for reducing friction,the subsequent construc-tion settlement control effect is evident,with a maximum land subsidence of 18.18 mm,and the deformation is within con-struction allowable range.
Author 张炎
邢慧堂
李鹏飞
刘浩
周华
王栋
AuthorAffiliation 济南轨道交通集团有限公司,250014,济南%河海大学土木与交通学院,210098,南京%中铁二十一局集团轨道交通工程有限公司,250117,济南
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Author_FL XING Huitang
LIU Hao
LI Pengfei
ZHANG Yan
WANG Dong
ZHOU Hua
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  fullname: XING Huitang
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  fullname: LIU Hao
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DocumentTitle_FL Settlement Control Techniques for Urban Rail Transit Station Entry/Exit Large Profile Pipe Jacking Engineering through Urban Roads
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Keywords 城市轨道交通出入口
under-passing construction
沉降控制
pipe jacking tunnel construction
FLAC 3D软件
urban rail transit entry/exit
FLAC 3D software
settlement control
顶管隧道施工
下穿施工
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Title 城市轨道交通车站出入口大断面顶管工程穿越城市道路的沉降控制技术
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