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Analysis of Surrounding Rock Vibration and the Influence of Soft Rock Mechanical Parameters During the Tunnel Blasting with Thin Bedrock Roof

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Abstract

The blasting construction of Shuidun Tunnel, China (a thin bedrock roof tunnel) is the engineering background in this paper. The numerical simulation method is adopted and combined with the verification of field measurement. The longitudinal, circumferential and radial distribution of the surrounding rock near the tunnel face is analyzed. The effects of various physical mechanical parameters of overlying soft rock on surrounding rock vibration are also discussed. The results may provide reference for construction safety control of similar projects. The main conclusions are as follows: The maximum value of the significant coefficient of cavity effect appears in the range of 2–4 m behind the tunnel face. The data like vault settlement within this range should be monitored emphatically. In the circumferential direction, the closer to the tunnel wall, the more significant the circumferential characteristic of the vibration velocity vector of surrounding rock is, and the maximum vibration velocity appears at the contact point between the rock layer interface and the tunnel contour wall. In the radial direction, the peak vibration velocity of surrounding rock decreases rapidly in the range of 1 m, while the attenuation tends to be gradual in the range of 2–4 m. The peak vibration velocity of surrounding rock near the tunnel face is positively correlated with the bulk density and poisson’s ratio of overlying soft stratum, and negatively correlated with its elastic modulus and internal friction angle of overlying soft stratum.

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Acknowledgements

The research reported in this paper was supported by the National Natural Science Foundation of China under Grant No. 51478474 and the Fundamental Research Funds for the Central University of Central South University under Grant No. 2019zzts291. The authors are grateful for the supports awarded.

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  1. School of Civil Engineering, Central South University, Shaoshan South Road No. 22, Changsha, 410075, China

    E. Deng, Weichao Yang & Pingping Zhang

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  1. E. Deng
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  2. Weichao Yang
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  3. Pingping Zhang
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Correspondence to Weichao Yang.

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Deng, E., Yang, W. & Zhang, P. Analysis of Surrounding Rock Vibration and the Influence of Soft Rock Mechanical Parameters During the Tunnel Blasting with Thin Bedrock Roof. Geotech Geol Eng 38, 537–550 (2020). https://doi.org/10.1007/s10706-019-01044-3

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