中砂岩地层TBM掘进三维离散元研究

Study on the TBM Tunneling in Medium Sandstone Using 3D DEM

以补连塔斜井施工为依托工程,采用离散元方法对TBM掘进过程进行三维数值模拟以研究TBM掘进参数和围岩变形规律。研究表明,一定范围内,中砂岩地层中刀盘扭矩与正面阻力随掘进速度基本呈线性增长,初始掘进阶段若顶进速度过快施工参数会出现较大峰值,可能超过机器额定值影响其工作效率。地层受扰动程度则随着开挖速度加快而不断减小。

Based on the Bulianta shaft construction, three dimensional discrete element method （DEM） was used to model the tunnel boring machine （TBM） tunnelling process, and the variation of construction parameters and surrounding rock deformation is revealed. Results show that within given range, the torque and thrust of cutterhead grow almost linearly with advancing speed. If the advancing speed is too high at the start of construction, the torque and thrust may reach the peak with high value and exceed the administration value. Besides, the surrounding rock deformation decreases with increasing advancing speed.