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| Theoretical and experimental study on ground impact damage effect under large equivalent explosion. Part II：Development of a simulation test system for
ground impact effect of deep buried caverns |
| LI Jie1，2，WANG Derong1，LI Zhihao1，JIANG Haiming1，XIONG Ziming1，GAO Lei1，2，FAN Pengxian1，WANG Mingyang1，2 |
| (1. State Key Laboratory of Explosion and Impact and Disaster Prevention and Mitigation，Army Engineering University of PLA，Nanjing，Jiangsu 210007，China；2. School of Mechanical Engineering，Nanjing University of Science and Technology，Nanjing，Jiangsu 210094，China) |
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Abstract Similar simulation test is an important research method for solving the safety problems of deeply buried caverns under high yield explosion. For a long time，however，the relevant researches have been difficult to carry out effectively due to the limitations of technical means and equipment. A three-dimensional simulation test system for ground impact effects in deeply buried caverns was developed by combining self-development and necessary borrowing，which solves the key technical problems of flexible and uniform long-time loading of high ground stress，fine adjustment of ground shock waveforms and the combined static and dynamic loading with high ground stress and ground shock. At 1∶50 to 1∶100 geometric and physical similarity，the device can realize the simulation of high ground stress loading，excavation disturbance process and explosive ground impact effect. With the equipment，the technical problems of limited prototype testing and lack of simulation means are solved. The test system was used to investigate the response mechanism of deep tunnels under combined dynamic and static loads. The results show that outside the safe burial depth boundary of the project designed according to the ultimate stress of the homogeneous rock mass，ground impact disturbance can still activate the movement of structural rock masses in the deeply buried rock mass，causing serious local damage to the construction. The test results show that the device operates stably and reliably，and can realistically reproduce the destruction process of deeply buried cavernous chambers under impact disturbance. It provides a reliable foundation platform for researches on the safety and protection of deeply buried caverns against large yield explosion impacts.
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2022, Vol. 41 
