砂质板岩地层下小断面盾构刀盘结构设计方法

Design Method for Cutterhead Structure of Small Section Shield Under Sandy Slate Stratum

刀盘设计合理性与地质适应性是盾构机顺利施工的前提,结合砂质板岩地层条件、刀盘结构及刀盘载荷计算模型对中国石化新疆煤制天然气外输管道(新粤浙)穿越长江隧道工程中所用盾构机刀盘进行结构设计,考虑刀高差影响,忽略刮刀对刀盘载荷影响,获得刀盘推力及转矩,并与工程实测数据进行对比,结果吻合度较高,证明所用载荷计算方法具有较高准确性。建立刀盘有限元模型,对刀盘进行静力学分析,由静力学分析结果:最大应力为189.5 MPa,出现在在刀盘面板与支撑环连接处;最大变形量为1.7545 mm,出现在刀盘中心双联滚刀安装区域,可知刀盘力学性能满足要求。研究结果可为砂质板岩地层盾构刀盘设计提供一定参考。

The rationality of cutterhead design and geological adaptability are the preconditions for the smooth construction of shield machine.In this paper,combined with sandy slate stratum conditions,cutterhead structure and cutterhead load calculation model,the structure design of shield machine cutterhead used in Sinopec Xinjiang coal to gas export pipeline(new Guangdong and Zhejiang)crossing Yangtze River tunnel project is carried out.Considering the influence of knife height difference,ignoring the impact of scraper on cutterhead load,the thrust and torque of cutterhead are obtained and compared with the measured data.The results are in good agreement with the measured data,which proves that the load calculation method used has high accuracy.The finite element model of cutter head is established,and the static analysis of cutterhead is carried out.According to the results of static analysis,the maximum stress is 189.5 MPa,which appears at the joint of cutter head panel and support ring;the maximum deformation is 1.7545 mm,which appears in the installation area of double cutter in the center of cutterhead,which shows that the mechanical properties of cutter head meet the requirements.The research results can provide some reference for the design of shield cutterhead in sandy slate stratum.