Experimental investigation of jointed rock breaking under a disc cutter with different confining stresses
Experimental investigation of jointed rock breaking under a disc cutter with different confining stresses
复制标题
不同围压圆盘滚齿刀节理破岩试验研究
DOI：
10.1016/j.crme.2018.06.012
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发表时间：
2018
影响因子：
0.8
通讯作者：
Cao Rihong
中科院分区：
文献类型：
--
作者：
Lin Qibin;Cao Ping;Cao Rihong
为了更好地了解隧道掘进机（TBM）盘形滚刀的破岩机理，人们进行了广泛而详细的研究，但当围压和节理特性变化时，盘形滚刀引起的裂纹扩展和破坏模式尚未得到全面研究。为了解决这一领域的研究，对三轴试验机（TRW-3000）进行了改造，以研究不同围压（0、2.5、5、7.5和10 MPa）对圆盘刀具引起的不同节理角度（0°、30°、60°和90°）岩石破碎的影响。在这一系列试验中，分析了具有不同围应力的完整和节理岩石的裂纹扩展和破坏模式。在实验过程中，观察到四种不同类型的故障模式。失效模式受低围应力下接头方向的影响。当围压增大到一定程度时，节理的存在对破坏模式没有明显影响。
Extensive and detailed investigations have been made to better understand the rock-breaking mechanism of the tunnel boring machine (TBM) disc cutter, but the crack propagation and failure modes induced by the disc cutter when the confining stresses and joint characteristics vary have not been comprehensively investigated. To address this area of research, a triaxial testing machine (TRW-3000) is modified to investigate the effect of different confining stresses (0, 2.5, 5, 7.5 and 10 MPa) on the rock breaking of different joint angles (0°, 30°, 60°, and 90°) induced by the disc cutter. In this series of tests, the crack propagation and failure modes of the intact and jointed rock with different confining stresses are analysed. During the experiments, four different types of failure modes have been observed. The failure mode is affected by the joint orientation at low confining stress. The existence of joints has no obvious effect on the failure mode when the confining stress increases to a certain extent.