考虑摩擦生热效应的泥水盾构刀盘热 结构耦合分析

在泥水盾构掘进过程中,刀盘与土体间的摩擦生热效应产生大量热量,导致渣土“烧结”固化,加重泥饼问题,同时过高的热应力也会对刀盘结构造成损伤。利用Solidworks软件建立泥水盾构刀盘三维几何模型,考虑刀盘与土体的相对滑移,基于ANSYS Workbench平台,计算由于摩擦生热引起的刀盘温度场及应力场时空演变规律。结果表明：刀盘应力场与温度场的空间分布规律具有一致性,刀盘外边缘及与牛腿柱相连接的面板附近存在应力集中现象,同时温度较高;摩擦生热效应会导致刀盘应力不断增长,随着刀盘温度上升,高应力区域存在扩大趋势;随着刀盘旋转,刀盘最大温度及平均温度随时间线性增长,刀盘最大温度每秒上升6.35℃,而刀盘平均温度每秒上升约0.019℃。

Thermal-mechanical coupling analysis of slurry #br#shield cutterhead considering friction heat

In the process of slurry shield tunneling, a large amount of heat generated by friction between cutter head and soil leads to the solidification of muck, which aggravates the problem of clay clogging. At the same time, high thermal stress will also cause damage to cutter head structure. Based on the ANSYS. Workbench, the temperature field and stress field of cutter head caused by friction heat are calculated. The results show that: The distribution law of stress field and temperature field of cutter head is consistent. There are stress concentration and high temperature near the outer edge of cutter head and the face plate near the bracket column. The friction heat will cause the stress of cutter head to increase continuously. With the increase of cutter head temperature, the high stress area will expand. With the rotation of the cutter head, the maximum and average temperature of the cutter head increase linearly with time. The maximum and average temperature of cutter head increased by 6.35℃ and 0.019℃ per second respectively.