Goaf collapse vibration analysis and disposal based on a experiment of heavy ball touchdown

YI Haibao; ZHANG Xiliang; YANG Haitao; LI Ming; GAO Qiqi; JIN Ke

doi:10.11883/bzycj-2018-0160

Volume 39 Issue 7

Jul. 2019

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YI Haibao, ZHANG Xiliang, YANG Haitao, LI Ming, GAO Qiqi, JIN Ke. Goaf collapse vibration analysis and disposal based on a experiment of heavy ball touchdown[J]. Explosion And Shock Waves, 2019, 39(7): 074101. doi: 10.11883/bzycj-2018-0160

Citation:

YI Haibao, ZHANG Xiliang, YANG Haitao, LI Ming, GAO Qiqi, JIN Ke. Goaf collapse vibration analysis and disposal based on a experiment of heavy ball touchdown[J]. Explosion And Shock Waves, 2019, 39(7): 074101. doi: 10.11883/bzycj-2018-0160

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Goaf collapse vibration analysis and disposal based on a experiment of heavy ball touchdown

doi: 10.11883/bzycj-2018-0160

YI Haibao^{1, 3
,},
ZHANG Xiliang^{1, 2},
YANG Haitao^{1, 3},
LI Ming^{1, 3},
GAO Qiqi³,
JIN Ke³

1.
Sinosteel Maanshan Institute of Mining Research Co. Ltd., Manshan 243000, Anhui, China
2.
CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei 230026, Anhui, China
3.
State Key Laboratory of Safety and Health for Metal Mines, Manshan 243000, Anhui, China

Received Date: 2018-04-20
Rev Recd Date: 2018-05-18

Available Online: 2019-06-25

Publish Date: 2019-07-01

Abstract

Abstract

Based on the similarity theory, the heavy ball landing experiments were conducted to simulate the collapse of the goaf in order to provide guidance for the goaf disposal. The particle peak vibration velocities corresponding to the balls with the mass 4 kg and 10 kg dropping from 1.0, 1.5 and 2.0 m respectively were measured experimentally on the basis of characteristics analysis of vibration wave. For the first time, the concepts of cumulative attenuation rate of vibration velocity and relative energy ratio were proposed. The collapse vibration velocity of the goaf was analyzed with the help of the Protodyakonov’s arch theory. The study shows that the mass and dropping height of the heavy ball are positively related to the vibration velocity, and the former has greater influence on the cumulative attenuation rate than that of the latter. With the increase of measuring distance, the overall vibration velocity shows an attenuation trend. The accumulative decay rates for 4 kg and 10 kg heavy balls at 3.0 m are 79.79%−81.61% and 79.95%−83.52%, respectively. Reflections and refractions at the interface of different media can cause a small " jump increase” in vibration velocity. The mass has a significant effect on vibration energy attenuation: the greater the mass, the slower the energy attenuation in the near area. The goaf collapsed mass is 582.5 t to 5 926.5 t and it causes the particle vibration velocity to be much larger than that of the safety allowable value. With the comprehensive treatment plan of " roof caving+slope slope cutting”, the slope safety factor can reach 1.26, completely eliminating the hidden dangers in the goaf area.
- heavy ball touchdown experiment,
- vibration velocity,
- goaf disposal,
- numerical analysis

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References(23)

References

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