Effect of interlayer material on dynamic mechanical properties of rock mass with combined hard and soft media

WANG Yanbing; SONG Jiahui; REN Bin; LIU Zhen; LONG Yongdong

doi:10.11883/bzycj-2023-0022

Volume 43 Issue 12

Dec. 2023

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WANG Yanbing, SONG Jiahui, REN Bin, LIU Zhen, LONG Yongdong. Effect of interlayer material on dynamic mechanical properties of rock mass with combined hard and soft media[J]. Explosion And Shock Waves, 2023, 43(12): 123101. doi: 10.11883/bzycj-2023-0022

Citation:

WANG Yanbing, SONG Jiahui, REN Bin, LIU Zhen, LONG Yongdong. Effect of interlayer material on dynamic mechanical properties of rock mass with combined hard and soft media[J]. Explosion And Shock Waves, 2023, 43(12): 123101. doi: 10.11883/bzycj-2023-0022

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Effect of interlayer material on dynamic mechanical properties of rock mass with combined hard and soft media

doi: 10.11883/bzycj-2023-0022

1.
School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
2.
State Key Laboratory of Geomechanics and Deep Underground Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China

Received Date: 2023-01-30
Rev Recd Date: 2023-08-08

Available Online: 2023-08-10

Publish Date: 2023-12-12

Abstract

Abstract

A split Hopkinson pressure bar (SHPB) device was used to study the dynamic mechanical properties and deformation and failure characteristics of the rock mass combined with different sandwich materials, using sandstone and granite as the soft and hard rock matrix. The discrete lattice spring method (DLSM) was used to further investigate the crack propagation, the reaction and transmission at the interlayer interface and the energy distribution characteristics of rock mass combined with different interlayer materials. The results show that the growth factor of rock mass dynamic strength increases with the increase of rock mass dynamic compressive strength, showing an obvious dynamic compressive strength dependence. The rock mass combined with different interlayer materials has a obvious nonlinear section in the initial loading stage, and the closed pores and cracks in the sandstone of non-interlayer rock have the longest nonlinear section in the initial stress stage. With the increase of the strength of interlayer material, the obstacle ability of interlayer to crack propagation and development of rock mass gradually becomes weak, and the energy consumption of rock mass crack and failure is gradually reduced. The failure of the intercalated rock mass starts at the cementation surface of the intercalated rock mass. With the increase of the strength of the intercalated material, the failure of the soft rock near the cementation surface is gradually intensified, while the hard rock has no obvious failure. The rock mass with interlayer has a good clipping effect. With the decrease of the strength of interlayer material, the peak stress value of both ends gradually increases and decreases, whilst the energy absorption density of the interlayer rock mass increases in a short time, and the stability becomes worse, so it is easy to be destroyed.
- intercalated rock mass,
- crack propagation,
- SHPB,
- discrete lattice spring method

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References(22)

References

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