摘要
为研究某盾构隧道φ12m级大直径泥水盾构刀盘设计的合理性以及对高水压密实砂层施工的适应性,结合大直径泥水盾构的特点以及以密实砂层为主的地层条件,提出考虑土压力与刀具贯入阻力、忽略砂土间的黏聚力的刀具载荷计算修正模型,综合考虑刀盘结构及其背部泥水压力对刀盘载荷及转矩的影响,获得刀盘的输入载荷和转矩。利用ANSYS软件,建立大直径泥水盾构掘进的仿真分析模型,对泥水盾构正常掘进、偏载以及脱困3种工况进行有限元分析。结果表明:偏载工况下,刀盘的应力和变形最大,最大应力出现在刀盘下半部的主臂支撑筋板与法兰连接处,达到128.46MPa;最大变形出现在刀盘边缘处,达到2.85mm,刀盘性能满足设计要求。
The rationality of cutterhead design of a φ12 m slurry shield used in a shield tunnel and its construction adaptability to dense sandy stratum with high water pressure are very important. Firstly, the characteristics of large-diameter slurry shield and the formation conditions dominated by dense sandy layer are introduced, a modified model for cutter load calculation is proposed by considering earth pressure and cutter penetration resistance and ignoring cohesion between sandy soils. By analyzing the influences of structure and back slurry pressure on cutterhead loads and torques, the input loads and torques of cutterhead are obtained. And then the simulation analysis model for large-diameter slurry shield tunneling is established by ANSYS software, and the finite element analysis of normal tunneling, unbalanced loading tunneling and jamming releasing of slurry shield is carried out. The results show that the stress and deformation of cutterhead are the largest under unbalanced loading tunneling condition, and the maximum stress occurs on the joint of the main arm support rib and flange at the lower half of the cutterhead, reaching 128. 46 MPa;the maximum deformation occurs to the edge of the cutterhead, reaching 2. 85 mm;and the performance of cutterhead can meet the design requirements.
作者
黄志高
陈鹏
何源福
刘纲
朱晓天
HUANG Zhigao;CHEN Peng;HE Yuanfu;LIU Gang;ZHU Xiaotian(State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 211000,Jiangsu,China;China Railway 14th Bureau Group Shield Engineering Co.,Ltd.,Nanjing 211800,Jiangsu,China;College of Mechanical and Electrical Engineering,Central South University,Changsha 410083,Hunan,China)
出处
《隧道建设（中英文）》
北大核心
2019年第6期1021-1029,共9页
Tunnel Construction
基金
国家电网公司科技项目(JSJS1600326)
湖南省科技重大专项(2014FJ1002)
国家高技术研究发展计划(“863”计划)项目(2012AA041803)
关键词
盾构隧道
大直径泥水盾构
刀具载荷
刀盘载荷
刀盘转矩
力学分析
shield tunnel
large diameter slurry shield
cutter load
cutterhead load
cutterhead torque
mechanical analysis
