Abstract
Rockburst hazards induced by high geostress are particularly prominent during the construction of underground engineering. Prevention and control of rockburst is still a global challenge in the field of geotechnical engineering, which is of great significance. Based on the tunnel group of the Jinping II hydropower station of China, this paper analyzed the mechanical principle of support in the process of construction, and discussed in detail the active release and passive support by numerical simulation and field application. The results show that as two active measures, stress relieve holes and advanced stress relief blasting can release the energy of the microseismic source and transfer the high stress to the deeper surrounding rock, make the surface rock wall with a relatively low stress act as a protective barrier. Their stress release rate is about 12% and 33% in this project, respectively. In term of passive measure, the combined rapid support, which is mainly composed of water swelling anchor and nano-admixture shotcrete, is also an effective way to prevent and control the rockburst under high geostress.
Highlights
With the development of transportation and economy, it is inevitable to build long large tunnels in deep underground space [1,2,3,4,5]
The diversion tunnels are constructed by the tunnel boring machine (TBM) and the drilling-blasting method
Rockburst hazards induced by high geostress are prominent in underground engineering construction
Summary
With the development of transportation and economy, it is inevitable to build long large tunnels in deep underground space [1,2,3,4,5]. Rockburst brought great challenges to the construction and advancement of the project, and seriously threatened the safety of construction personnel and caused huge economic losses It has always been a worldwide problem in the field of rock underground engineering and rock mechanics [27,28,29]. The prediction and prevention of rockbursts are of great significance to the successful construction in deep-buried underground engineering. Li et al [43] presented a comprehensive rockburst monitoring method based on the MS technology, and the obtained evolutionary process of a rockburst were analyzed by numerical simulation, advanced three-dimensional numerical modeling and visualization can identify potentially hazardous areas and assist in planning and design underground structures [44,45,46,47,48]. The results can provide a direct assist for the prevention and control of a rockburst in deep-buried underground engineering
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
