Vibration speed prediction method for foundation pit static blasting close to structures

Abstract

The invention discloses a vibration speed prediction method for foundation pit static blasting close to structures. The method includes: adopting a genetic neural network to predict vibration speed ina static blasting influence range, to be more specific, taking GSI (geological strength index), rock hardness degree mi, rock disturbing degree D, explosive load G and distance b between explosive load holes and nearby structures or pipelines as input parameters, acquiring sample input parameter distribution on the basis of an orthogonal design principle, and adopting a TNT equivalent method forequivalence of a liquid carbon dioxide rock breaking device into a TNT explosive model to further adopt LS-DYNA software for calculating to generate sample output parameters, adopting a training sample set to train the genetic neural network to obtain a mapping relation between the input parameters and the output parameters, and adopting the mapping relation to realize practical vibration speed prediction in engineering.

Description

technical field [0001] The invention relates to the field of construction, and more specifically, to a vibration velocity prediction method for static blasting of foundation pits adjacent to structures. Background technique [0002] When the excavation process of foundation pit encounters high rock face and hard rock formation, it is necessary to use blasting excavation to remove the hard rock. The traditional blasting method is a special operation, which requires a professional team and strict approval. The construction cost is high and it has great harm to the surrounding environment. In addition, the excavation of urban foundation pits is close to existing buildings and underground pipelines. The use of blasting excavation will inevitably affect them, and in severe cases, it will cause loss of personnel and property. [0003] Liquid carbon dioxide blasting technology is a new blasting technology, which uses liquid carbon dioxide to rapidly gasify and expand when heated a...

AI Technical Summary

Problems solved by technology

[0005] Using traditional numerical calculation to predict the blasting vibration velocity requires high quality calculation personnel, long calculation period, and needs to set different parameters for different working conditions for repeated calculation, which cannot meet the requirements of on-site construction.

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