泥饼工况下盾构刀盘热-力耦合分析

Thermo-mechanical coupling analysis of shield cutter head under mud cake condition

由于在渣粘土质中盾构刀盘中心泥饼的形成造成刀盘出现热损伤等失效,研究了在泥饼作用下刀盘在盾构掘进过程中的热-应力耦合问题,得出刀盘在泥饼作用下的温度场和热-应力耦合场分布规律。利用Solidworks和ANSYS软件建立了盾构刀盘三维有限元模型,结果表明:泥饼形成时,温度在短时间内急剧升高,导致热应力在同一时间内急剧增大到168.2MPa,最大热变形达到3.1mm,并且刀盘中心出现了翘曲现象。

Aiming at the cutter head thermal damage and other failure problems caused by shield cutter head mud formation in residue and clay soil, the problem of thermal-stress coupling of shield cutter head under the effect of mud in the tunnelling process is studied, and the cutter head temperature and thermal-stress distribution of coupling fields under mud effect are acquired. A shield cutter head three-dimensional finite element model is built by using software ANSYS and Solidworks. The results shows that when the mud is formed,the temperature rises sharply in a short time,which leads to a rapid increase of thermal stress to 168.2 MPa,at the same time,the maximum thermal deformation reaches 3.1 mm,then the center of cutter head is wrapped.