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Based on the project of Erzhuangke expansion tunnel, this paper aims to investigate the influence of the blasting vibration caused by the expanded tunnel excavation on the adjacent existing lining, then a reasonable safety control criterion is proposed. The 3D finite element analysis, combined with field test, was employed to analyze peak particle velocity (PPV) and the maximum tensile stress of the existing lining under the closely tunnel blasting. The results demonstrate that the blasting vibration attenuation rate of existing lining is faster within the range of about 1.5B from the blasting source, then gradually tends to be flat, and the two sides are basically symmetrical distribution. However, the PPV and tensile stress of the side wall and arch waist of the existing lining nearest to the blasting source are significantly larger than those of other locations, so it is more likely to be damaged. The numerical simulation results are in good agreement with the field test, which also verifies the accuracy of the field test results and the rationality of the numerical simulation. Moreover, the safety control criterion based on the PPV and maximum tensile stress is established to ensure the operation safety of existing tunnels, and the PPV safety criterion of existing lining is 10.73 cm/s, so that the maximum allowable charge of a single section should be controlled within 41.05 kg.

Influence and safety control of blasting vibration on existing lining for closely tunnel expansion