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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α=0°、90°时,抗侵入系数基本一致,当α=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α=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。
In order to study the influence of rock joint parameters (joint spacing and joint inclination) on rock breaking efficiency of TBM disc cutter, the actual conditions were simplified, and under the action of indenter on the improved test equipment Deformation of materials, destruction test. The intrusion depth and load data of the indenter during the whole loading process are collected, and the real-time camera shooting is used to obtain the development process of the surface destruction of the test specimen and the final damage morphology. Experimental results show that as the joint pitch increases, as the joint spacing increases, the penetration load reaches the leaping point and the penetration work and main crack propagation energy also increase. When α = 0 ° and 90 ° , Anti-invasion coefficient is basically the same, when α = 30 °, 60 °, the anti-invasion factor gradually increased. When the joint spacing is constant, with the increase of angle, the load of jump point, the anti-invasion coefficient, intruding work and main crack propagation energy all decrease at first and then increase. At α = 30 °, the values are the minimum . According to the morphological analysis of specimen after failure, it is found that the spatial characteristics of joints have a significant control over the crack propagation mode and also have obvious limitations on the formation of the damaged area.