A Direct Calculation Method of Equivalent Shear Wave Velocity of Soil Layer Based on Surface Wave Dispersion Characteristics
A calculation method, shear wave technology, applied in the field of foundation soil survey, infrastructure engineering, construction, etc., can solve the problems of wrong calculation results, inversion analysis and low calculation efficiency, and achieve the effect of improving efficiency and accuracy
Active Publication Date: 2021-07-02
DALIAN UNIV OF TECH +1
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The calculation efficiency of inversion analysis is low, and the calculation may fall into the local optimum instead of the global optimum, resulting in erroneous calculation results
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[0031] The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings and technical solutions.
[0032] The surface wave dispersion data, inversion analysis results and drilling results of an actual site are used to verify the effectiveness of this method.
[0033] The specific implementation is as follows:
[0034] (1) Carry out surface wave data collection on the survey site, see figure 1 , the site uses 62 4.5 Hz geophones to record the surface wave signal from the impact of the 5 kg steel hammer on the right side and the ground. The trigger sensor is bound to the steel hammer. When the steel hammer hits the ground, the trigger sensor triggers and controls the acquisition. Data collection. The obtained surface wave raw data can be found in figure 2 , conduct dispersion analysis on the original data to extract surface wave dispersion features from the original surface wave data, the extraction re...
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The invention belongs to the field of geotechnical engineering site exploration, and proposes a method for directly calculating the equivalent shear wave velocity of a soil layer based on surface wave dispersion characteristics. Divide the soil layer of the site to be analyzed into multi-layer structures of equal thickness, analyze the surface wave data obtained on the site to extract the dispersion characteristics, and calculate the shear wave velocity of the first layer of soil; establish the calculation of the shear wave velocity of the second layer of soil formula, substituting the half-wavelength surface wave phase velocity within the depth range of the second layer of soil and the shear wave velocity of the first layer of soil to calculate the shear wave velocity of the second layer of soil; reuse the obtained information combined with longer wavelength The phase velocity of the surface wave component is used to calculate the shear wave velocity of the deeper layer of the soil layer; the equivalent shear wave velocity of the survey site is calculated based on the change of the obtained soil shear wave velocity with depth. The developed direct calculation method of soil equivalent shear wave velocity can avoid low efficiency and local optimal inversion analysis, and has important engineering significance for improving the efficiency and accuracy of engineering site classification using surface wave method.
Description
technical field [0001] The invention belongs to the technical field of geotechnical engineering site exploration, and proposes a method for directly calculating the equivalent shear wave velocity of a soil layer based on surface wave dispersion characteristics. Background technique [0002] The equivalent shear wave velocity of the soil layer is an important parameter for the classification of engineering sites, and the classification of engineering sites is one of the necessary steps to determine the design earthquake action. The surface wave method is an important method to obtain the shear wave velocity of the soil layer, which has the advantages of non-destructive, rapid and economical. The surface wave method mainly includes three steps: (1) Obtaining field surface wave data, (2) Dispersion analysis to extract surface wave dispersion characteristics, and (3) Calculation of soil shear wave velocity with depth based on surface wave dispersion characteristics Changing pro...
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IPC IPC(8): E02D1/02
CPCE02D1/022
Inventor 林世镔王誉瑾
Owner DALIAN UNIV OF TECH