Method for calculating underground vibration based on ground vibration under spherical charging condition

Abstract

The invention discloses a method for calculating underground vibration by ground vibration based on a spherical charging condition. The method comprises the following steps of measuring the density, elasticity modulus and Poisson's ratio of a representative rock sample, and calculating a P wave velocity and an S wave velocity; separating an incident P wave from the vibration velocity waveform of aground measuring point; determining the position of an underground to-be-measured point, and determining the time difference between the arrival of a direct P wave, a reflected P wave and a reflectedSV wave at the underground to-be-measured point and the arrival of a P wave at the ground measuring point according to the position of the underground to-be-measured point; calculating vibration speeds of the direct P wave, the reflected P wave and the reflected SV wave at the underground to-be-measured point; and superposing the three columns of waves of the direct P wave, the reflected P wave and the reflected SV wave to obtain a vibration speed of the underground to-be-measured point. The method for calculating the underground vibration by ground vibration based on the spherical charging condition has the advantages that the defect that a traditional ground surface vibration testing method cannot directly reflect underground vibration is overcome, the vibration quantity in a rock-soilmedium can be calculated only by measuring basic mechanical parameters of the rock-soil medium and the vibration quantity of one measuring point on the ground surface, and the method has high economicbenefits.

Description

technical field [0001] The invention relates to the technical field of blasting vibration safety, in particular to a method for calculating underground vibration from ground vibration under the condition of spherical charge. Background technique [0002] Due to the advantages of high efficiency and low cost, blasting construction has been widely used in the field of geotechnical engineering. However, when the seismic vibration caused by blasting has a high amplitude and low frequency, it may endanger the safety of surrounding personnel and buildings. Therefore, it is very necessary to monitor the blasting vibration. [0003] At present, the monitoring of blasting vibration is generally realized by fixing the speed sensor or acceleration sensor on the ground, which can reflect the ground vibration, but cannot directly reflect the underground vibration. The current monitoring method of blasting vibration is not accurate enough for vibration safety assessment involving undergr...

AI Technical Summary

Problems solved by technology

[0003] At present, the monitoring of blasting vibration is generally realized by fixing the speed sensor or acceleration sensor on the ground, which can reflect the ground vibration situation, but it cannot directly reflect the underground vibration situation

The current monitoring method of blasting vibration is not accurate enough for vibration safety assessment involving underground structures

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