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Study on Blasting Characteristics of Shallow and Deep Soft-hard Rock Strata Based on Energy Field

  • Geotechnical Engineering
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KSCE Journal of Civil Engineering Aims and scope Submit manuscript

Abstract

The expected blasting effect of rock mass is always affected by the soft-hard rock strata with anisotropic mechanical properties, especially under the influence of in-situ stress. Based on discrete element method (PFC2D), single-hole blasting experiments are carried out considering effect of soft-hard rock strata and in-situ stress. The result is analyzed from the perspectives of cracks state, cracks number, cracks extension range and energy fields. The results show that: 1) Under different in-situ stress fields, damage degree of rock mass increases first, then decreases rapidly and ultimately keeps stable with growth of soft rock thickness. Through fitting, better change laws are obtained. 2) When detonation in hard rock, if distance between blasthole and structural plane is larger than about 4 times the radius of crushing area, cracks development is restrained with the growth of in-situ stress. 3) Rock damage degree of rock firstly ascends and then descends with growth of Uniaxial Compressive Strength (UCS). Rock damage degree reaches maximum at about 40 MPa and descends with growth of in-situ stress, when it is greater than about 80 MPa. 4) When detonation in hard rock and lower in-situ stress, if structural plane is outside crushing area, peak kinetic energy will decrease with the growth of in-situ stress as well as peak friction energy, which is contrary to the peak strain energy.

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Abbreviations

A :

Cross section area of contact

C P :

P-wave velocity

C S :

S-wave velocity

E F :

Friction energy

E K :

inetic energy

E S :

Strain energy

F :

Sum of external force

F b :

Particle force at the boundary

F d :

Fashpot force

\(\overline {{F_n}} \) :

Normal force of the contact

\(\overline {{F_s}} \) :

Tangential force of the contact

g :

Acceleration of body force

I :

Moment of inertia

J :

Polar moment of inertia

k n :

Normal stiffness

k s :

Shear stiffness

L :

Angular momentum

m i :

Mass of the particle

M b :

Bending moment

M t :

Twisting moment

n :

Particles number

p(t):

Explosion pressure

P max :

Maximum of detonation pressure

\(\overline R \) :

Radius of the bond

t :

Blasting process time

\({{\dot u}_n}\) :

Normal velocity of the particle

\({{\dot u}_s}\) :

Tangential velocity of the particle

v i :

Velocity of the particle

ẍ:

Acceleration of particle

\({\dot \delta}\) :

Relative translation velocity

ΔT :

Sum of loading and unloading time

η :

Dispersion effect correction coefficients of S-wave

σ t max :

Maximum of normal stress

τ max :

Maximum of shear stress

ω :

Angular velocity

ζ :

Dispersion effect correction coefficients of P-wave

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Acknowledgements

This project was supported by the National Natural Science Foundation of China (52068066,51908482), Autonomous Region Graduate Scientific Research Innovation Project (XJ2022G050) and Science and Technology Research and Development Project of CSCEC (CSCEC-2020-Z-56).

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Authors and Affiliations

  1. College of Civil Engineering and Architecture, Xinjiang University, Urumqi, 830017, Xinjiang, China

    Jianbin Cui, Liangfu Xie & Yongjun Qin

  2. Xinjiang Civil Engineering Technology Research Center, Urumqi, 830017, Xinjiang, China

    Liangfu Xie & Yongjun Qin

  3. Xinjiang Academy of Architectural Science (Limited Liability Company), Urumqi, 83002, Xinjiang, China

    Liangfu Xie & Xuejun Liu

  4. Dept. of Geotechnical Engineering, Tongji University, Shanghai, 200092, China

    Jiangu Qian

Authors
  1. Jianbin Cui
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  2. Liangfu Xie
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  3. Yongjun Qin
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  4. Xuejun Liu
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  5. Jiangu Qian
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Corresponding author

Correspondence to Liangfu Xie.

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Cui, J., Xie, L., Qin, Y. et al. Study on Blasting Characteristics of Shallow and Deep Soft-hard Rock Strata Based on Energy Field. KSCE J Civ Eng 27, 1942–1954 (2023). https://doi.org/10.1007/s12205-023-0494-1

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  • DOI: https://doi.org/10.1007/s12205-023-0494-1

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