In this research, the failure mechanism and anomalous behavior of intact and jointed rock block having a circular tunnel under compression are studied. This was done by monitoring the progressive failure of a rock tunnel subjected to uniaxial loading. The tests were conducted in sandstone blocks and “Acoustic Emission” (AE) technique was used to identify the crack damage and other failure attributes. Three cases have been considered in the research, i.e. tunnel in the intact rock, with horizontal joints, and with vertical joint sets. Images of progressive failure, acoustic signals, and applied loads were simultaneously recorded during the test. The intact block demonstrates continuous crack generation while the block with horizontal joint set shows a stepwise cracking pattern. In the third case where the vertical joints were employed, the deformation was largely roof failure and joint perpendicular extension was dominant. The AE events show that a sudden drop and then a quiet period of seismic “Ib value” could be considered as the precursors to forecast the rockburst hazard. The paper also compares the results of the physical model test with a 2D finite element model. The compared results show good agreement between the physical and numerical models.

在这项研究中，研究了具有圆形隧道的受压完整和节理岩块的破坏机理和异常行为。这是通过监测岩石隧道在单轴荷载作用下的渐进破坏来完成的。测试是在砂岩块中进行的，“声发射”（AE）技术用于识别裂纹损伤和其他破坏属性。研究中考虑了三种情况，即完整岩石中的隧道，水平节理和垂直节理组。测试过程中同时记录了渐进式故障，声音信号和施加的载荷的图像。完好无损的砌块显示出连续的裂缝产生，而水平接头组的砌块则显示出逐步的裂缝模式。在采用垂直节理的第三种情况下，变形主要是屋顶破坏，而节理的垂直延伸占主导。声发射事件表明，地震“ Ib值”突然下降然后处于平静期可以被视为预测岩爆危险的先兆。本文还将物理模型测试的结果与2D有限元模型进行了比较。比较结果表明，物理模型和数值模型之间具有良好的一致性。