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Energy identification method for slope earthquake damage

An identification method and earthquake damage technology, applied in the direction of earthquake signal processing, etc., to achieve the effect of high innovation, improved cognition level, and improved interpretation level

Inactive Publication Date: 2018-10-16
SICHUAN UNIV
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Problems solved by technology

[0003] The traditional research on slope failure mode is mostly based on the displacement and deformation monitoring of the slope surface in model tests or numerical analysis, and fails to start with the characteristic parameters of the slope itself and the internal monitoring physical quantities of the slope.

Method used

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  • Energy identification method for slope earthquake damage
  • Energy identification method for slope earthquake damage
  • Energy identification method for slope earthquake damage

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Embodiment

[0048] This embodiment takes the Qingping wave of the Wenchuan earthquake as an example to illustrate, as figure 1 As shown, an energy identification method for slope damage caused by earthquakes includes the following steps:

[0049] a. Perform band-pass filtering and baseline correction preprocessing on the seismic wave time histories measured at different locations of the seismic damage site on the slope layer;

[0050] b. Carry out empirical mode decomposition on the preprocessed seismic wave time history, and generate multiple such as Figure 2A , Figure 2B, Figure 2C and Figure 2D The eigenmode function components shown;

[0051] Let X(t) represent the preprocessed seismic wave time history data, after empirical mode decomposition of the preprocessed seismic wave time history:

[0052]

[0053] 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, t...

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Abstract

The invention discloses an energy identification method for slope earthquake damage. The method comprise the following steps that measured earthquake wave time interval is pretreated; empirical mode decomposition is carried out to generate a plurality of intrinsic mode functions; Hilbert transform is carried out on each intrinsic mode function to obtain a time-frequency spectrum of each intrinsicmode function; a marginal spectrum of a corresponding earthquake wave time interval is obtained according to the time-frequency spectrum of each intrinsic mode function; quantitative identification iscarried out on earthquake wave energy in a slope according to the obtained marginal spectrums; the earthquake wave energy distribution in a slope body is determined, and the position where earthquakedamage in the slope body occurs is concluded according to the earthquake wave energy distribution; according to the position where the earthquake damage in the slope body occurs, slop surface displacement and a fracture observation result are combined to conclude a damage mode of a consequent rock slope containing a weak intercalated layer. The method fundamentally reveals a failure mechanism ofthe slope under the action of earthquake, and has broad application prospects in the field of civil engineering and geological disaster prevention.

Description

technical field [0001] The invention relates to the technical field of geological disasters, in particular to an energy identification method for slope earthquake damage. Background technique [0002] Empirical Mode Decomposition (EMD) is a component of HHT (Hilbert-HuangTransform), which was published by Norden E. Huang and Steven R. Long in 1998 "The Empirical Mode Decomposition and A method for dealing with non-stationary signals proposed in the Hilbert Spectrum for Nonlinear and Non-stationary Time Series Analysis". The function of EMD is to decompose the non-stationary signal into several intrinsic mode functions IMF (intrinsic ModeFunction) that satisfy the Hilbert transform, and perform Hilbert transform on these IMFs to obtain the distribution of the instantaneous frequency of the signal. EMD is fully self-adaptive, and can adaptively generate "basis" according to specific signals, that is, the IMF generated by the "screening" process, without preset basis functions...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/30
Inventor 范刚周家文张建经戚顺超李海波
Owner SICHUAN UNIV
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