... the paper describes the impact of the in-situ rock stress on the tunnel/cavern stability and corresponding rock support design. The hazardous effects resulting from spalling and rock burst associated with very high in-situ rock stress are addressed with an example of the world longest road tunnel...

... the ratio, the more stable the wall rock. When Pb / Sh ≥1.8,the stability of surrounding rocks was well. When Pb / Sh ≤1.50, hard rock is potential to happen rock burst, soft rock is easy to convergent distort. When 1.8> Pb / Sh >1.50, the wall rock was in the critical condition of distortion...

... carried out in surrounding rock for monitoring the rock burst. The study detected that the acoustic emission parameters multiply before the occurrence of rock burst. Furthermore, the wave-form was obtained when rock burst occurred though analyzing acoustic emission signal. The results of the analyses...

... ABSTRACT: Therewas a hydropower in the transition zone between Qinghai-Tibet plateau and Sichuan Basin, while excavating the traffic tunnel towards its underground structure at about 631m horizontal depth, many rock burst happened at right arch, and the hydraulic fracturing three dimensional...