岩石节理倾角和间距对隧道掘进机破岩特性影响的试验研究

为了研究岩体节理参数（节理间距和节理倾角）对全断面岩石掘进机（TBM）盘形滚刀破岩效果的影响，对实际条件进行简化，在改进的试验装置上进行压头作用下相似材料的变形、破坏试验。采集整个加载过程中压头的侵入深度和荷载数据，并采用相机实时拍摄，获得试件表面破坏的发展过程以及最终破坏形态。试验结果表明，当节理倾角一定时，随着节理间距增大，达到跃进点的贯入荷载值增加，侵入功以及主裂纹扩展能量也都呈增大趋势，当 =0°、90°时，抗侵入系数基本一致，当 = 30°、60°时，抗侵入系数逐渐增大。当节理间距一定时，随着 角度的增加，跃进点荷载、抗侵入系数、侵入功以及主裂纹扩展能量都呈现先减小后增大趋势，在 =30°时，各值都为最小值。根据试件破坏后形态分析发现，节理的空间特征对裂纹扩展模式有明显的控制作用，对破坏区域的形成也有明显的限制。

Experimental study of influence of joint space and joint angle on rock fragmentation by TBM disc cutter

To study the rock joint parameters,joint space and joint angle of rock fragmentation by full face rock tunnel boring machine(TBM) disc cutter,the test of high-strength gypsum specimen penetrated by wedge indentation is applied.Data of penetration depth and loads during the loading process are collected.Shooting with the camera in real time,photograph of the specimen surface damage and failure mode of the development process are taken.The results show that: when joint angle is constant,a greater joint space needs a greater penetration load when loading value drops,it also needs greater penetration power and crack propagation energy;when joint angle equals to 0 and 90,anti-invasive factor is consistent.When the joint angle equals to 30 and 60,with the increase of joint space,anti-invasive factor increases.When the joint spacing is constant,with the increase of the angle,the peak load,penetration power and crack propagation energy decrease and then increase.When joint angle equals to 30,the values are the minimum.According to a morphological analysis after the destruction of specimens,it is found that the spatial characteristics of joints crack obviously control the crack mode and have significant limitations for the damage region.