Acquisition method of dynamic response characteristics of adjacent concrete pipelines during foundation pit excavation and blasting

Abstract

The invention discloses a method for acquiring dynamic response characteristics adjacent to a concrete pipeline during foundation pit excavation blasting. The method comprises the following steps of selecting a test field, burying a test pipeline, blasting a test blasthole and testing, wherein the blasting of the blasthole comprises layout of test blasthole, loading of the test blasthole and detonation of test blasthole; the testing comprises the following steps that pipeline internal stress and strain testing is conducted to obtain the change situation of the pipeline internal stress and strain under the action of blasting vibration; pipeline internal vibration speed and acceleration testing is conducted to obtain the change situation of the pipeline internal vibration speed and acceleration under the action of blasting vibration; soil pressure, speed and acceleration in a soil body at the upper part of the pipeline are tested to obtain the change situation of the soil pressure, the speed and the acceleration in different places in the soil body at the upper part of the pipeline under the action of blasting vibration; and ground surface speed of the upper part of the pipeline is tested to obtain the change situation of the vibration speed in the axial direction of the pipeline at the right upper part of the pipeline under the action of blasting vibration, and the change situation of the vibration speed in the direction perpendicular to the axial direction of the pipeline.

Description

technical field [0001] The invention relates to the field of rock and soil mechanics, in particular to a method for obtaining dynamic response characteristics of adjacent concrete pipelines during foundation pit excavation and blasting. Background technique [0002] The existing "Blasting Safety Regulations" (GB6722-2014) stipulates the safety allowable standards of blasting vibration for adobe houses, civil buildings, commercial buildings, tunnels, roadways, etc., but lacks the safety allowable standards for blasting vibration of buried pipelines. As the lifeline of the city, the underground pipe network involves various aspects such as gas transmission and water transportation. Once damaged, it will easily cause disasters such as gas leakage and water cutoff, which will seriously affect people's life and production safety and produce major adverse social effects. In recent years, with the continuous acceleration of urban municipal construction and development, and with the...

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Problems solved by technology

[0002] The existing "Blasting Safety Regulations" (GB6722-2014) stipulates the safety allowable standards of blasting vibration for adobe houses, civil buildings, commercial buildings, tunnels, roadways, etc., but lacks the safety allowable standards for blasting vibration of buried pipelines

As the lifeline of the city, the underground pipeline network involves various aspects such as gas transmission and water transmission. Once damaged, it is easy to cause disasters such as gas leakage and water cut-off, which seriously affects people's life and production safety and produces major adverse social effects.

In recent years, with the continuous acceleration of urban municipal construction and development, and with the construction and development of large-scale urban subways and other municipal projects (including subway stations, passages, etc.), blasting, as an important means of engineering construction rock and soil excavation, often has When the excavation and blasting operation area of ​​the urban foundation pit is close to the buried pipeline in service, the harmful effect of the blasting earthquake generated by the excavation and blasting operation of the urban foundation pit will cause damage to the adjacent buried concrete pipeline, which is safe and efficient for the urban foundation pit project. Construction and the protection of people's life and property pose a serious threat

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