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A New Safety Control Method of Blasting Excavation in High Rock Slope with Joints

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Abstract

In this paper, a new safety control method of the jointed slope under blasting excavation is presented. The spatial distribution of blasting damage and time-history characteristic of dynamic stability around the joint were investigated carefully based on the secondary development of the explicit FE code, LS-DYNA. Results clearly indicated that the evolution law of damage and stability are opposite with the change of joint angle, and the dual-controlled mechanism of damage extension and stability fluctuation exists in the safety control of the high rock slope with joints. Then a new safety control method is proposed by implementing the equivalent Blasting Safety Control Standard (BSCS) which includes coupled effects of damage and stability. Results reveal that a critical joint angle exists, and if the inclination is larger than the threshold value, the BSCS depends on damage extension, otherwise it was determined by stability fluctuation. Finally, site experiments are implemented carefully based on the blasting excavation of the famous Baihetan high rock slope with columnar joint in China to verify the rationality of the new control approach. Sonic wave test, displacement measurement and blasting vibration test are implemented for nearly two years to track the evolution process of damage and stability of the jointed slope. Experimental results demonstrate that the new approach could improve the accuracy rate of control by 40%.

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Abbreviations

λ:

Sensitivity constant

D C :

Compress damage symbols

\(D\) :

Damage symbols

\(\overline{\mu }\) :

Passion’s ratio for damaged material

\(\mu\) :

Passion’s ratio for undamaged material

\(D_{t}\) :

Tensile damage symbols

\(C_{d}\) :

Crack density parameter

T i :

Shear force on the bottom surface of slice i

N i :

Normal force on the bottom surface of slice i

x i :

Shear force on the side of slice i

E i :

Normal forces on the side of slice i

F i :

External force on top of the potential landslide

Fx i :

Horizontal inertial forces of blasting vibration

Fy i :

Vertical inertial forces of blasting vibration

δ :

Angle between the sliding surface of slice i with horizontal direction

U i :

Hydrostatic pressure on the bottom surface of slice

\(\varphi_{bi}\) :

Strength parameters of the sliding surface

C bi :

Strength parameters of the sliding surface

PW i :

Hydrostatic pressures on the sides of slice i

\(\eta\) :

Attenuation index of the blasting vibration with time

f :

Principal frequency

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Acknowledgements

This work is supported by Chinese National Natural Science Foundation (CKSF2019477/YT; 51609017) and the Hubei province natural science foundation of China (2016CFB605). The authors wish to express their thanks to all supporters.

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Authors and Affiliations

  1. Changjiang River Scientific Research Institute, Wuhan, 430010, People’s Republic of China

    Yingguo Hu, Zhaowei Yang, Shuling Huang, Wenbo Lu & Gen Zhao

  2. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, 430072, China

    Yingguo Hu, Zhaowei Yang, Shuling Huang, Wenbo Lu & Gen Zhao

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  1. Yingguo Hu
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  2. Zhaowei Yang
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  3. Shuling Huang
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  4. Wenbo Lu
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  5. Gen Zhao
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Correspondence to Yingguo Hu.

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Hu, Y., Yang, Z., Huang, S. et al. A New Safety Control Method of Blasting Excavation in High Rock Slope with Joints. Rock Mech Rock Eng 53, 3015–3029 (2020). https://doi.org/10.1007/s00603-020-02113-3

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  • DOI: https://doi.org/10.1007/s00603-020-02113-3

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