反井钻机小倾角扩孔排渣泥岩下落运动学特征机理研究

Mechanism of mudstone falling characteristic in small dip angle reaming and slagging of raise boring machine

反井钻井法采用的是反向钻进破岩方式,钻头破碎形成的岩渣靠自重下落,不存在重复破碎现象,破岩效率高,钻进速度快。在小倾角反井施工条件下,钻头扩孔时岩渣无法像竖直或大倾角施工条件下靠自重稳定下落。论文分别应用饱和土在运动方向的平衡公式和斯氏改进公式计算与试验进行对比,结果显示了理论计算与试验结果相吻合,证明了理论的准确性。

The raise boring machine uses reverse drilling to break rock.The rock slag is generated in the drilling and falls by its own weight,thus there is no repeated crushing,the rock breaking efficiency is high,and the drilling is fast.While in raise boring with a small dip angle,unlike vertical or large angle construction,the slag cannot fall stably by its own weight.In this paper,the balance formula of the saturated soil in the direction of motion and the improved formula of Scherzler are used to compare the calculation results with experiments.The results show that the theoretical calculations are consistent with the experiments,and accuracy of the theory is proved.