土压平衡式盾构盾体结构优化设计与仿真  

Structural Optimization Design and Simulation of Shield Body of Earth Pressure Balance Shield

作　　者：王哲 张拓[1] 贺星星 Wang Zhe;Zhang Tuo;He Xingxing

机构地区：[1]北方重工集团有限公司 [2]徐工特种工程机械有限公司

出　　处：《工程机械》2023年第2期62-68,I0013,共8页Construction Machinery and Equipment

摘　　要：以沈阳地铁二号线南延线第2标段工程项目的地质资料为依据,通过水、土分算的方式获得了盾体表面水、土载荷分布特性。基于载荷分析和设备功能需求搭建盾体三维结构框架,通过有限元仿真对各种工况下盾体结构进行强度与刚度分析,获取盾体等效应力云图与位移云图,明确设计结构中的薄弱环节,并进行相应的优化设计。结果表明:(1)盾体承受的土压和摩擦力关于隧道纵向截面对称分布,其数值在0~180°范围内呈先减小后增大的趋势;(2)盾体直径设计成阶梯布局,同时配置超前注浆接口、盾体径向润滑系统和承压隔板接口能有效提高盾构的施工安全与效率;(3)盾体在整个施工过程中运行平稳,变形微小,验证了该盾体设计的合理性及有限元仿真分析方法的可行性。Based on the geological data of South Extension Bid 2 project of Shenyang Metro Line 2,the load distribution characteristics of water and soil on the surface of the shield body are obtained by separate calculation of water and soil.Based on the load analysis and equipment functional requirements,the three-dimensional structure framework of the shield body is built,and the strength and stiffness of the shield body structure under various working conditions are analyzed through finite element simulation to obtain the equivalent stress and displacement nephograms of the shield body,to clarify the weak points in the designed structure and to optimize the design accordingly.The results show that,(1) the earth pressure and friction force on the shield body are symmetrically distributed along the longitudinal section of the tunnel,and their values tend to decrease first and then increase in the range of 0 to 180;(2) the diameter of the shield body is designed in a stepped layout,and the configuration of advanced grouting interface,shield body radial lubrication system and pressure-bearing spacer interface can effectively improve the safety and efficiency of shield construction;(3) the shield body runs smoothly throughout the construction process with tiny deformation,which verifies the rationality of the shield body design and the feasibility of the finite element simulation analysis method.

关 键 词：土压平衡式盾构 盾体 结构优化设计 载荷分析 有限元仿真 

分 类 号：U231.3[交通运输工程—道路与铁道工程] U455.43[建筑科学—桥梁与隧道工程]