基于岩石破碎体积的滚刀效率评估模型

结合岩石的不同破坏方式,如剪切破坏、张拉破坏、挤压破坏及多种破坏方式混合作用等,探讨了岩石破碎体积的计算方法.根据在滚刀作用下岩石以剪切破坏和张拉破坏为主的特性,提出以岩石破坏时裂纹长度、剪切面在岩石自由表面投影长度及滚刀刀刃宽度间的关系来识别岩石破坏方式,计算岩石破碎体积.利用CSM模型计算破岩比能,评估滚刀破岩效率.并通过实例对该方法进行了计算验证,结果表明该方法能够为TBM的性能预测和优化提供一定参考.

Cutter Efficiency Assessment Model Based on Broken Rock Volume

The calculation method of the rock volume broken by TBM disc cutters was discussed by considering different rock fragmentation modes， such as shear failure， tensile failure， extrusion failure and multi-failure modes. Due to the fact that shear failure and tensile failure are the dominate fracture modes of rock under the load of disc cutters， the quantitative relations among the crack length， the projected length of the shear fracture and the width of the cutter edge were used to identify the rock failure mode and calculate the volume of fragmentized rock. The rock crushing work ratio was calculated based on the CSM model to evaluate rock breaking efficiency of the disc cutters. This method was verified through an engineering project and results showed that this method could provide a reference for the performance prediction and optimization of TBM.