磨料水射流辅助与常规工况下滚刀破岩特性对比研究

A comparative study on rock breaking by a disc cutter under abrasive water jet-assisted and conventional working conditions

为了研究磨料水射流辅助与常规工况下滚刀破岩特性的差异性,开展了两种工况下的破岩试验,对比分析了不同切削间距下岩石破碎状态、破岩载荷以及破岩效率的差异性。研究结果表明,相较于传统滚刀破岩,磨料水射流辅助滚刀破岩可提高滚刀贯入硬岩的能力,促使裂纹在岩体内部的拓展,产生大尺寸岩渣。磨料水射流辅助下滚刀垂直力和滚动力均明显低于常规滚刀破岩,平均下降了39%和25%,同时,磨料水射流辅助下滚刀破岩量增多,破岩效率进一步提高,约为常规滚刀破岩效率的1倍~2倍。研究结果为提高硬岩地质条件下滚刀破岩性能,实现隧道掘进机(tunnel boring machine,TBM)的高效掘进提供参考。

To compare the rock-breaking characteristics of disc cutters under abrasive water jet-assisted and conventional working conditions,rock-breaking experiments under two working conditions were carried out.The differences in the rock-breaking state,disc cutter load,and rock-breaking efficiency were compared and analyzed.Results show that compared with conventional rock-breaking of disc cutters,the rock-breaking of disc cutters under abrasive water jet-assisted can improve the ability of disc cutters to penetrate hard rock,promote the expansion of cracks inside rock interior,thereby generating large-size rock chip.The vertical and rolling force of the disc cutters under abrasive water jet-assisted is significantly lower than that of the conventional disc cutter rock breaking,with an average decrease of 39%and 25%.In addition,the amount of rock-breaking by disc cutters under abrasive water jet-assisted increases,and the rock-breaking efficiency is further improved,which is 1-2 times that of conventional rock-breaking of disc cutter.Results provide a reference for improving the rock-breaking performance of disc cutters under hard rock geological conditions and efficient excavation of tunnel boring machine(TBM).