切缝辅助滚刀破岩临界间距试验及预测模型研究

Experimental and Prediction Model Study on Threshold Spacing of Slit-assisted Cutter Rock Breaking

提高坚硬岩石条件下滚刀破岩能力是隧道施工的长期追求目标,而采用水射流辅助滚刀破岩可有效降低岩石开挖难度和刀具载荷,是一种很有前景的新型破岩技术。针对水射流切缝辅助滚刀破岩这一方式,首先采用破岩试验验证了切缝间距对切缝辅助滚刀破岩效果的影响,证明在岩石材料、贯入度、切缝深度一定条件下,切缝辅助滚刀破岩存在一个临界间距,当切缝间距小于临界间距时,切缝侧才能发生贯通破碎;然后采用岩石剪切破坏理论分析并提出了一个线性化临界间距计算模型,该模型表明临界间距的大小与切缝深度L和贯入度H的差值(L-H)线性线性相关。

In order to investigate the improvement of the rock breaking ability of a disc cutter under hard rock conditions,the use of a water jet-assisted cutter to break rock was explored as a promising new rock breaking technology.The impact of slit spacing on the effectiveness of slit-assisted cutter rock breaking was verified through rock breaking tests in this study.It was demonstrated that,under specific conditions of rock material,penetration depth,and slit depth,there exists a threshold spacing for slit-assisted cutter rock breaking.Only when the slit spacing is less than the threshold spacing,can penetration crushing occur on the slit side.Additionally,the rock shear damage theory was applied to analyze and propose a linearized threshold spacing prediction model,which indicates that the threshold spacing is linearly correlated with the difference between the slit depth(L)and the penetration depth(H),denoted as(L-H).