Assessment and control of the blasting vibration effect on local residences during the excavation of abutment slope in the Baihetan Project

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (1) : 248-258.

ZOU Yu-jun1,2 YAN Peng1,2 LIU Lin3 ZHOU Tian-gang4 LU Wen-bo1,2 CHEN Ming1,2

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Abstract

The assessment and control of the blasting vibration effect on local residences have great significance to guarantee the successful engineering construction and decrease the dispute between inhabitants and construction companies. According to the inspection and classification of local residences above the right dam abutment slope in Baihetan hydropower station, monitoring schemes were determined. Based on the study on the failure mechanism of residential structures due to blasting vibration, the safety control standards of blasting vibration were recommended by combining the domestic and overseas corresponding criterions. Through longtime tracking monitoring, the influenced zone was divided by the influenced degree of blasting vibration, and the vibration responses of different types of residences were analyzed. It is concluded that for the areas from which the scaled distances to the blast center are less than 90m/kg1/3, between 90~150m/kg1/3 and greater than 150m/kg1/3, the influenced degree will be, successively severe general and slight. According to the analysis of the vibration energy, the blasting scale should be controlled in order to reduce the cracking risk of residential structures. Moreover, reasonably enlarging the linear charge density of pre-splitting holes to improve the pre-splitting blasting effect and meanwhile strictly restricting the maximum explosive charge weight of pre-splitting holes are the direct and effective measures to control the blasting vibration influences on local residences.

Key words

Baihetan hydropower station / dam abutment slope / blasting vibration / control standards / effect assessment

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ZOU Yu-jun1,2 YAN Peng1,2 LIU Lin3 ZHOU Tian-gang4 LU Wen-bo1,2 CHEN Ming1,2. Assessment and control of the blasting vibration effect on local residences during the excavation of abutment slope in the Baihetan Project[J]. Journal of Vibration and Shock, 2018, 37(1): 248-258

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