Simulation test technique for impact disturbance of deep surrounding rock

LI Zhihao; XIONG Ziming; YUE Songlin; JI Yuguo; LIU Chenkang; XU Tianhan; JIANG Haiming; LI Jie

doi:10.11883/bzycj-2021-0184

Volume 42 Issue 2

Feb. 2022

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LI Zhihao, XIONG Ziming, YUE Songlin, JI Yuguo, LIU Chenkang, XU Tianhan, JIANG Haiming, LI Jie. Simulation test technique for impact disturbance of deep surrounding rock[J]. Explosion And Shock Waves, 2022, 42(2): 024101. doi: 10.11883/bzycj-2021-0184

Citation:

LI Zhihao, XIONG Ziming, YUE Songlin, JI Yuguo, LIU Chenkang, XU Tianhan, JIANG Haiming, LI Jie. Simulation test technique for impact disturbance of deep surrounding rock[J]. Explosion And Shock Waves, 2022, 42(2): 024101. doi: 10.11883/bzycj-2021-0184

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Simulation test technique for impact disturbance of deep surrounding rock

doi: 10.11883/bzycj-2021-0184

1.
State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact, Army Engineering University of PLA, Nanjing 210007, Jiangsu, China
2.
School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu , China

Received Date: 2021-05-12
Rev Recd Date: 2021-09-26

Available Online: 2021-12-25

Publish Date: 2022-02-28

Abstract

Abstract

Aiming to simulate the long-term continuous loading process of high confining pressure deep underground spaces under the explosion and impact disturbance, alignment and related tests on the simulation test apparatus were carried out. An air pressure driven piston was used to impact the shaping material and produce an impact disturbance. After passing through the conical cover, the wave front expanded, resulting in a uniform stress wave acting on the cabin body. Main parameters of the far-field disturbed stress wave under explosion were analyzed, and the instrument parameters satisfying the similarity law were obtained by dimensional analysis. The effects of gas pressure, solenoid valve opening time, piston speed, water pressure and shaping material on the shape, positive pressure time, rising pressure time and peak value of the stress wave were discussed by using the developed instrument. The results illustrate that the lower the stiffness of shaping materials, the longer the positive pressure time and rising pressure time of the stress wave, and the lower the peak value of stress. Although an increase in the piston impact velocity will bring an increase in the peak of the stress wave, it will not significantly affect the positive pressure time and waveform. The piston speed can be determined by controlling the opening time of the solenoid valve and the gas pressure in the air chamber. By changing the shaping material and impact speed of the piston, the positive pressure time can be adjusted between 3.5 ms and 5.0 ms, pressure rising time between 0.9 ms and 2.5 ms, and peak value between 4 MPa and 8 MPa. The adjusted pressure waveform output can effectively simulate the far-field explosion stress wave in the deep surrounding rock. The polymethyl methacrylate (PMMA) composite structure was used as the specimen to verify the feasibility and reliability of the apparatus in simulating the impact disturbance in the deep surrounding rock. The above tests prove that this apparatus can provide explosive ground shock disturbances with controllable parameters for laboratory tests. This apparatus enriches the research of simulating explosion disturbances in deep geomechanical test systems.
- deep surrounding rock,
- round impact disturbance,
- coupled static and dynamic loading,
- testing apparatus

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References(29)

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