The Prevention and Control Mechanism of Rockburst Hazards and Its Application in the Construction of a Deeply Buried Tunnel

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.

Developing a New Bursting Liability Index Based on Energy Evolution for Coal under Different Loading Rates

“…The region is divided into two parts: U d and U e . In a uniaxial load, U e is the releasable elastic strain energy and is defined in Equation ( 2) [44].…”

The Sustainability Performance of Reinforced Concrete Structures in Tunnel Lining Induced by Long-Term Coastal Environment

“…At present, China has developed into one of the countries with the largest scale, the largest number, the most complex structural forms and the most complex construction technologies of tunnels and underground projects in the world [5][6][7][8][9]. Both the tunnel construction process and the operation stage are facing great challenges [10][11][12]. Reinforced concrete structure has been the first choice for lining structures of tunnels in offshore areas due to their advantages such as high rigidity, high bearing capacity, easy placement, economical cost, and wide application.…”

Rockburst Identification Method Based on Energy Storage Limit of Surrounding Rock

“…Rapid economic growth is boosting the development of underground resources and the construction of deep underground infrastructure at an unprecedented speed [1][2][3]. Due to the increasing depth and the impact of structural stresses, deeply buried tunnels often pass through high geo-stress areas with complicated strata [4][5][6][7][8][9][10][11]. High elastic strain energy exists in deep rock masses in high geo-stress areas.…”

“…Tang et al introduced a microseism monitoring system and applied microseism monitoring technology for rockburst monitoring and early warning. By comparing the actual site situation with the microseism monitoring results, they revealed the correlation between the microseism evolution and the rockburst, explained the causes of rockburst in terms of internal and external factors influencing the rockburst, and put forward four rockburst criteria [10,[30][31][32][33]. Feng et al made comprehensive use of positive functions of microseism monitoring and acoustic emission technologies and focused on the study of the generation mechanism of tunnel rockburst, monitoring and early warning, and the dynamic support in the later period.…”