Experimental study of different typical shape falling-rocks impacting on the sand cushion and dimensionless analysis

YAN Peng; FANG Qin; ZHANG Jinhua; ZHANG Yadong; CHEN Li; FAN Junyu

doi:10.11883/bzycj-2020-0219

Volume 41 Issue 7

Jul. 2021

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YAN Peng, FANG Qin, ZHANG Jinhua, ZHANG Yadong, CHEN Li, FAN Junyu. Experimental study of different typical shape falling-rocks impacting on the sand cushion and dimensionless analysis[J]. Explosion And Shock Waves, 2021, 41(7): 073303. doi: 10.11883/bzycj-2020-0219

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Experimental study of different typical shape falling-rocks impacting on the sand cushion and dimensionless analysis

doi: 10.11883/bzycj-2020-0219

YAN Peng^1
,,
FANG Qin¹,
ZHANG Jinhua^{2, 3
,
,},
ZHANG Yadong^{2, 3},
CHEN Li^{2, 3},
FAN Junyu^{2, 3}

1.
PLA Army Engineering University, Nanjing 210007, Jiangsu, China
2.
Engineering Research Center of Safety and Protection of Explosion and Impact of Ministry of Education (ERCSPEIME), Southeast University, Nanjing 211189, Jiangsu, China
3.
School of Civil Engineering, Southeast University, Nanjing 211189, Jiangsu, China

Received Date: 2020-06-30
Rev Recd Date: 2020-08-03

Available Online: 2021-07-05

Publish Date: 2021-07-05

Abstract

Abstract

An experimental study on the impact force and penetration of falling rocks with three typical shapes, including spherical, conical and flat shapes, against the cushion was carried out. The experimental results show that the shape of the falling rock has a significant influence on the impact results. Under the same conditions, the flat blocks have the highest impact force, the lowest penetration depth and the shortest peak impact time, and the opposite for the conical falling rocks, with spherical blocks are between the two. The dimensionless analysis method was adopted to convert the mass, velocity, shape, size of the falling rock, the strength and density of the cushion layer into the dimensionless strength impact factor I, density impact factor λ and shape impact factor ψ. The correlation analysis between the impact factors and penetration test data shows that: (1) The effects of the impact factors I and λ on the final depth of penetration z_m/d are similar. (2) The analysis of the impact factors I and λ effects on penetration depth shows that I and λ are relatively independent. The pattern of the I effects on the depth of penetration is generally consistent for different λ values.
- falling rock’s shape,
- impact force,
- penetration depth,
- dimensionless,
- cushion

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References

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