With the rapid development of underground caverns in the fields of hydraulic engineering, mining, railway and highway, the frequency, and intensity of rockburst and dynamic instability have gradually increased, which has become a bottleneck restricting the safe construction of deep caverns. This paper presents a review of the current understanding of rockburst precursors and the dynamic failure mechanism of the deep tunnel. Emphasis is placed on the stability of the surrounding rock of the deep tunnel, the rockburst prediction method, and the dynamic failure characteristics of the surrounding rock of the deep tunnel. Throughout the presentation, the current overall gaps in understanding rockburst precursors and the dynamic failure mechanism of deep tunnels are identified in an attempt to stimulate further research in these promising directions by the research community.
This paper has designed and implement of a deep search engine oriented to the domain of popular science using subject search technique and the deep web integration technique. It has introduced the system architecture 、 the subject information gathering strategy as well as the key technologies it used, and our web page classifier has high precision with experimental verification. In the end, system retrieval effect is showed and the related work is described.
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