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Slope seismic stability time frequency analysis method

A time-frequency analysis and stability technology, applied in seismic signal processing and other directions, which can solve the problems of complex operation of numerical analysis methods, questionable accuracy of calculation results, and inability to consider time-frequency-amplitude characteristics of seismic waves at the same time.

Inactive Publication Date: 2018-11-23
SICHUAN UNIV
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Problems solved by technology

[0003] At present, the commonly used methods for calculating the seismic stability of slopes are mainly the Newmark slider analysis method, the numerical analysis method, and the quasi-static method commonly used in engineering. The Newmark slider analysis method and the quasi-static method cannot simultaneously consider the time of seismic waves. -Frequency-amplitude characteristics. Although the numerical analysis method can consider the time-frequency-amplitude characteristics of seismic waves, the operation of the numerical analysis method is complicated, and if there is no verification and verification of other research methods, the accuracy of the calculation results of the numerical analysis method Doubtful

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  • Slope seismic stability time frequency analysis method
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  • Slope seismic stability time frequency analysis method

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Embodiment

[0070] Such as figure 1 As shown, a time-frequency analysis method for slope seismic stability includes the following steps:

[0071] a. For the measured seismic wave time history (such as figure 2 shown) for empirical mode decomposition to generate multiple eigenmode functions (such as image 3 shown);

[0072] Using X(t) to represent the seismic wave time history data, after performing empirical mode decomposition on the seismic wave time history:

[0073]

[0074] where t is time, c j (t) is the jth order intrinsic mode function IMF j , r n (t) is the residual component after n times of empirical mode function decomposition, the residual component r n (t) is a constant, a monotone function or a function with only one maximum and minimum point;

[0075] b. Perform Hilbert transform on each eigenmode function generated in step a to obtain each eigenmode function c 1 (t), c 2 (t)...c n The time spectrum of (t), from which the time, frequency and amplitude of the ...

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Abstract

The invention discloses a slope seismic stability time frequency analysis method comprising the following steps: carrying out experience modal decomposition for measured seismic wave time histories, thus forming a plurality of intrinsic modal functions; carrying out Hilbert transformation for each formed intrinsic modal function, thus obtaining a time frequency spectrum of each intrinsic modal function, and extracting time, frequency and amplitude of the seismic wave time history from the time frequency spectrum; calculating a stress state on a slope bedding plane according to separated amplitude and instantaneous frequency of each intrinsic modal function; accumulating calculation results of all intrinsic modal functions, thus obtaining the stress state of the slope bedding plane under the seismic wave time history effect; calculating a sliding force and an anti-sliding force of the slope bedding plane under the seismic wave time history effect; calculating a safety factor of the slope stratified slope. The method can fully consider the seismic wave time-frequency-amplitude factors when making time frequency analysis on the slope seismic stability, thus obviously improving the slope seismic stability evaluation accuracy and reliability.

Description

technical field [0001] The invention relates to the technical field of geological disasters, in particular to a time-frequency analysis method for slope seismic stability. Background technique [0002] Seismic wave, as a complex random signal, has typical time-frequency-amplitude characteristics, and the stability of slope under earthquake is greatly affected by the time-frequency-amplitude characteristics of seismic waves. [0003] At present, the commonly used methods for calculating the seismic stability of slopes are mainly the Newmark slider analysis method, the numerical analysis method, and the quasi-static method commonly used in engineering. The Newmark slider analysis method and the quasi-static method cannot simultaneously consider the time of seismic waves. -Frequency-amplitude characteristics. Although the numerical analysis method can consider the time-frequency-amplitude characteristics of seismic waves, the operation of the numerical analysis method is compli...

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/30
Inventor 范刚周家文张建经杨长卫戚顺超
Owner SICHUAN UNIV
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