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Determination method for speed of earth surface vibration caused by cylindrical waves in rock

A technology of vibration velocity and determination method, which is applied in seismology, geophysical measurement, seismic signal processing, etc., and can solve problems such as lack of theoretical reference

Inactive Publication Date: 2019-11-29
CHANGAN UNIV
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Problems solved by technology

Generally, the research on the surface vibration caused by it mainly adopts the numerical simulation method, and there is a lack of corresponding theoretical reference.

Method used

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  • Determination method for speed of earth surface vibration caused by cylindrical waves in rock
  • Determination method for speed of earth surface vibration caused by cylindrical waves in rock
  • Determination method for speed of earth surface vibration caused by cylindrical waves in rock

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Embodiment Construction

[0041] The embodiments and effects of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0042] refer to figure 1 , the embodiment of the present invention provides a method for determining the surface vibration velocity caused by cylindrical waves in the rock mass. In this embodiment, the selected density is ρ, the bulk modulus is K, the shear modulus is G, and the Poisson's ratio is v , the wave velocities of longitudinal wave (i.e. reflected P wave) and transverse wave (i.e. reflected S wave) are c p and c s The linear elastic rock mass is taken as an example, including the following steps:

[0043] Step 1, establish a planar analysis model of cylindrical waves in rock mass, determine the front characteristics of initial cylindrical waves and the time domain equation of incident waves;

[0044] Exemplarily, the surface vibration includes two parts: vibration caused by body waves and vibration caused by surface...

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Abstract

The invention discloses a determination method for the speed of earth surface vibration caused by cylindrical waves in rock, and belongs to the technical field of rock mechanics. The method comprisesthe steps of firstly building a plane analysis model, and acquiring a real-time wave beam of a body wave at any point on the earth surface according to a ray theory and the attenuation characteristicof the cylindrical waves; and acquiring real-time speed of reflected P and S waves according to reflection characteristics of the cylindrical waves on a free surface, and then computing the speed of the earth surface vibration caused by the joint effect of incident waves and reflected waves according to a propagation direction of each wave; then, acquiring the speed of surface waves and the earthsurface vibration caused by the surface waves via a speed difference between any two adjacent points on the earth surface; and at last, acquiring the earth surface vibration speed according to a superposition principle. According to the method, the theorical comparison verification method is provided for an earth surface vibration response test or a numerical simulation research, prediction on thevibration of the engineering blasting surface is facilitated, and reference is provided for related rock engineering.

Description

technical field [0001] The invention belongs to the technical field of rock mechanics and engineering, and in particular relates to a method for determining the surface vibration velocity caused by cylindrical waves in rock mass. Background technique [0002] The dynamic load caused by engineering blasting usually propagates in the rock mass in the form of stress wave. Shock waves from underground explosions often cause vibrations on the surface when they reach the surface and can cause damage to structures on the surface. The prediction of ground surface vibration is particularly important in the construction and design of underground engineering. For a long time, in research and practice, blasting-induced waves are generally regarded as plane waves, which is reasonable when the source is relatively far away. However, when blasting operations are carried out near existing structures or rock damage near the blast site needs to be monitored and controlled, the plane wave as...

Claims

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/303
Inventor 柴少波李建春李娜娜戎立帆
Owner CHANGAN UNIV
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