关键词: 直墙拱形巷(隧)道, 岩爆, 单轴压缩试验, 声波监测, 劈裂, 波速

Abstract: Aiming at the monitoring and test of rockburst, the uniaxial compression tests and acoustic monitoring of rockburst in straight-wall-top-arch roadways(tunnels) were carried out and on this basis rockburst splitting and shearing were discussed.The results show that the failure surface of surrounding rock is rough and showing thin splitting block and the whole sample is also showing a distinct splitting rockburst; wave velocity can reflect the rock damage evolution process; and wave velocity from constant to lessening can be used as the dot of critical damage for rockburst prediction which can be achieved by monitoring velocity variation; surrounding rock internal development and changes can be a very good grasp by monitoring the waveform, especially waveform sparse and periodic increase; combination of qualitative and quantitative monitoring by the comprehensive monitoring of sound velocity, waveform sparse and periodic increase can timely and accurately predict rockburst in order to protect personnel and equipment safety; comprehensive expression of splitting rockburst is developed by the stress intensity factor and the ratio of rock's compressive-tensile strength and the numerical value corresponding to rockburst intensity standard of stress intensity factor are developed; stress intensity factor criterion of splitting rockburst is between 0.27－0.80(R=10－30 ); shearing failure condition will be satisfied with the increase of stress intensity factor and the main failure form will develop in the direction of shearing failure.

Key words: straight-wall-top-arch roadways(tunnels), rockburst, uniaxial compression test, acoustic monitoring, splitting, wave velocity