海底隧道基岩突起段地层典型滚刀破岩实验研究

为制定高强度花岗岩基岩突起地层的盾构掘进方案，在汕头海湾隧道现场取回花岗岩岩样，测试出CAI值及元素成分，进行滚刀破岩实验，对比分析相同工况下48.26 cm（19英寸）2种典型盘形滚刀（镶齿和一般平刃）的破岩效果，研究48.26 cm（19英寸）一般平刃在不同推力和刀间距下的掘进参数变化情况。实验结果表明： 1）工程现场的花岗岩岩样Si元素平均含量为37.35%，CAI值为3.56~3.91，为高磨蚀性岩石； 2）相同工况下，一般平刃滚刀具有更高的掘进效率； 3）单把滚刀总推力为300 kN时，掘进速度为4.1 mm/min。

Experimental Research on Rock Breaking by Typical Disc Cutters in Bedrock Protrusion Section of Subsea Tunnel

Granite samples are collected from Shantou Bay Tunnel Project to test the CAI values and elemental compositions of the samples and to carry out disc cutter rock breaking experiment. And then comparison of rock breaking effect is made between 2 typical disc cutters(with and without inserting alloy teeth) under the same diameter of 48.26 cm(19″). Finally, the boring parameter variation of disc cutter without inserting alloy teeth under different thrusts and cutter spaces is studied. The experimental results show that: (1) The average content of Si in the granite samples is 37.35% and the CAI values is 3.56-3.91, which indicaters that the samples are highly abrasive. (2) The disc cutters without inserting alloy teeth have a higher tunneling efficiency than the ones with inserting alloy teeth. (3) The total thrust of a single disk cutter is 300 kN, and the corresponding tunneling speed is 4.1 mm/min.