Subway foundation pit blasting method

Abstract

The invention provides a subway foundation pit blasting method. The subway foundation pit blasting method comprises the steps that a small shallow hole diameter blasting area is arranged in a foundation pit within the range away from the underground continuous wall side boundary by 5.0 m, and a large deep hole diameter blasting area is arranged in the foundation pit outside the range away from the underground continuous wall side boundary by 5.0 m; a row or multiple rows of damping holes are formed in the position, away from the underground continuous wall side boundary by 0.5 m, of the periphery of the foundation pit, and PVC tubes are arranged in the damping holes. The damping holes and difference holes are adopted, the earthquake wave strength can be reduced by 30%, through the millisecond elementary error delay detonation technology, the blasting vibration is reduced, the blasting vibration strength is controlled to the maximum limit, the damage effect on the foundation pit bottom plate rock layer can be reduced, the blasting damage to the surrounding building can be prevented, the harm to the public facilities and vehicle pedestrians can be prevented, and safety of the surrounding environment is protected.

Description

technical field [0001] The invention relates to the field of blasting methods in subway foundation pits, in particular to a subway foundation pit blasting method in which differential holes and damping holes are matched. Background technique [0002] Due to the massive construction of subways in various cities, some pits with solid surrounding rocks need to be cleaned by means of blasting. Some subway construction areas are located in prosperous areas of the city, very close to surrounding buildings and traffic, and the vibration intensity caused by blasting is very high. It is easy to have an adverse impact on the surrounding environment, and if it is serious, it will cause earthquake damage, affect the structural stability of the building, the smooth operation of traffic, and even cause the loss of personnel and property. Contents of the invention [0003] The object of the present invention is to overcome the deficiencies in the prior art and provide a subway foundation...

AI Technical Summary

Problems solved by technology

[0002] Due to the massive construction of subways in various cities, some pits with solid surrounding rocks need to be cleaned by means of blasting. Some subway construction areas are located in prosperous areas of the city, very close to surrounding buildings and traffic, and the vibration intensity caused by blasting is very high. It is easy to have adverse effects on the surrounding environment. If it is serious, it will cause earthquake damage, affect the structural stability of the building, the smooth operation of traffic, and even cause the loss of personnel and property.

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