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| Review of the evolution and mitigation of the water-inrush disaster in drilling-and-blasting excavated deep-buried tunnels |
| JIAO Yuyong, ZHANG Weishe, OU Guangzhao, ZOU Junpeng, CHEN Guanghui
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| Faculty of Engineering, China University of Geosciences, Wuhan 430074, Hubei, China |
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Abstract The deep-buried tunnel has the characteristics of high in-situ stress, high osmotic pressure and rich sources of disasters. These factors can significantly increase the risk of water-inrush. Drilling-and-blasting excavation method must be adopted in some sections. The water-inrush in drilling-and-blasting excavated deep-buried tunnel are commonly characterized by concealment, complexity, suddenness and destructiveness and the disaster mechanism is more complicated. There are still some problems in the existing researches, such as the detection and identification of disaster source are inaccurate, the constructed disaster mechanism is unclear, the prevention and control of malignant disasters are inadequate. The existing theories and technologies are not fully applicable anymore, thus, the prevention and mitigation of geological hazards are the key scientific issues remained to be solved. The existing research status are analyzed from three aspects: the advanced geological prediction, the disaster mechanism of water-inrush, and the evolution and mitigation of constructed disaster. Three suggestions were put forward about the key points and directions of the research on the water-inrush in deep tunnel. First of all, it is necessary that comprehensive application of big data analysis and the latest research results of other subjects in order to achieve quantitative and accurate detection. Furthermore, the catastrophic model of disaster sources should be established from the perspective of energy storage and release. The occurrence conditions and emergency mechanism of engineering disasters need revealing. In addition, the method of calculating the safety of impermeable silt layers should be developed and the existing research results also should be applied to practical engineering. Last but not least, the risk assessment theory of the water-rich soft rock section of deep-buried tunnel should be studied seriously. According to the actual conditions of the tunnel, the different technologies of disaster control should be combined organically to maximize the benefits of technology, economy, resources and environment.
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Received: 17 April 2018
Published: 22 February 2019
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