软流塑地层盾构切削大直径钢筋混凝土悬臂排桩工程实践  

Engineering Practice of Shield Cutting Cantilevered Large-diameter Reinforced Concrete Pile in Soft Fluid-plastic Stratum

作　　者：宋跃均 杨昊 廖秋林 梁博阳 甄浩天 SONG Yuejun;YANG Hao;LIAO Qiulin;LIANG Boyang;ZHEN Haotian(Shaoxing Railway Transit Co.,Ltd.,Shaoxing 312000,Zhejiang,China;Beijing Urban Rail Transit Construction Engineering Co.,Ltd.,Beijing 100176,China;School of Mechanics and Civil Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China)

机构地区：[1]绍兴市轨道交通集团有限公司,浙江绍兴312000 [2]北京城建轨道交通建设工程有限公司,北京100176 [3]中国矿业大学(北京)力学与土木工程学院,北京100083

出　　处：《科技和产业》2024年第11期253-260,共8页Science Technology and Industry

基　　金：中国科学院重点部署项目(ZDRW-ZS-2021-3-1)。

摘　　要：为研究刀具及施工参数对盾构切削大直径钢筋混凝土悬臂排桩的影响,以绍兴某区间工程为依托,开展地表及结构变形、钢筋破坏形态、刀具磨损研究。结果表明:采用“慢推速,中转速,小扭矩,严控浆,早补强,勤量测”的策略,圆满完成切桩任务;钢筋破坏分为剪拉、弯拉、纯剪3种破坏形态,推进速度对破坏形态影响较大;刀具磨耗为2.1~2.4 mm,随轨迹半径增加而增大,左线明显高于右线;软流塑地层盾构切削钢筋混凝土悬臂排桩掘进参数为推进速度2~5 mm/min,刀盘转速0.85 r/min,推力8500~9500 kN,刀盘扭矩1000~1500 kN·m。研究成果可为相似工程提供借鉴。To study the effects of tooling and construction parameters on the cutting of large-diameter reinforced concrete cantilever piles by shield tunneling,with a focus on a specific section of the project in Shaoxing,research on surface and structural deformations,modes of rebar failure,and tool wear was conducted.The results show that the strategy of’slow thrusting speed,medium rotary speed,low torque,strict control of slurry,early reinforcement,and frequent measurement’successfully completed the pile cutting task.Rebar failure can be categorized into shear-pull,flexural-pull,and pure shear modes,with thrusting speed having a significant impact on the failure mode.Tool wear is approximately 2.1 to 2.4 millimeters,increasing with the radius of the trajectory,with the left side significantly higher than the right.For shield tunneling of reinforced concrete cantilever piles in soft-flow plastic strata,recommended excavation parameters are:2-5 mm/min of thrusting speed,a disc rotation speed of 0.85 r/min,a thrust of 8500~9500 kN,and a disc torque of 1000~1500 kN·m.The research findings can serve as a reference for similar projects.

关 键 词：软流塑地层 切钢筋 悬臂排桩 钢筋破坏形式 刀具磨损 

分 类 号：U45[建筑科学—桥梁与隧道工程]