The Experts below are selected from a list of 6 Experts worldwide ranked by ideXlab platform

Yongxiang Wei - One of the best experts on this subject based on the ideXlab platform.

  • inversion of waveforms from xiangtang borehole seismic array for Soil Dynamic Property
    Acta Seismologica Sinica, 2007
    Co-Authors: Xueliang Chen, Xing Jin, Xiaxin Tao, Yongxiang Wei
    Abstract:

    In order to understand the site Soil response of the Xiangtang borehole seismic array under real strong ground motion, reveal the site response, verify the technique of borehole exploration, and improve the precision of in-situ test and laboratory test, this paper presents a new approach, which is composed of two methods. One is the layered site seismic response method, whose layer transform matrix is always real. The other is a global-local optimization technique, which uses genetic algorithm (GA)-simplex method. An inversion of multi-component waveforms of P, SV and SH wave is carried out simultaneously. By inverting the records of three moderate and small earthquakes obtained from the Xiangtang borehole array (2#) site, the Soil Dynamic characteristic parameters, including P velocity, damping ratio and frequency-dependent coefficient b, which has not been given in previous literatures, are calculated. The results show that the Soil S wave velocity of the Xiangtang 2# borehole is generally greater than that obtained from the 1994 in-situ test, and is close to the velocity of the 3# borehole, which is more than 200 m away from the 2# borehole. Meanwhile, perceptible Soil nonlinear behavior under peak ground motion of about 60×10−2 m/s2 is detected by the inversion analysis. The presented method can be used for studying the Soil response of other borehole array sites.

Xiaxin Tao - One of the best experts on this subject based on the ideXlab platform.

  • inversion of waveforms from xiangtang borehole seismic array for Soil Dynamic Property
    Acta Seismologica Sinica, 2007
    Co-Authors: Xueliang Chen, Xing Jin, Xiaxin Tao, Yongxiang Wei
    Abstract:

    In order to understand the site Soil response of the Xiangtang borehole seismic array under real strong ground motion, reveal the site response, verify the technique of borehole exploration, and improve the precision of in-situ test and laboratory test, this paper presents a new approach, which is composed of two methods. One is the layered site seismic response method, whose layer transform matrix is always real. The other is a global-local optimization technique, which uses genetic algorithm (GA)-simplex method. An inversion of multi-component waveforms of P, SV and SH wave is carried out simultaneously. By inverting the records of three moderate and small earthquakes obtained from the Xiangtang borehole array (2#) site, the Soil Dynamic characteristic parameters, including P velocity, damping ratio and frequency-dependent coefficient b, which has not been given in previous literatures, are calculated. The results show that the Soil S wave velocity of the Xiangtang 2# borehole is generally greater than that obtained from the 1994 in-situ test, and is close to the velocity of the 3# borehole, which is more than 200 m away from the 2# borehole. Meanwhile, perceptible Soil nonlinear behavior under peak ground motion of about 60×10−2 m/s2 is detected by the inversion analysis. The presented method can be used for studying the Soil response of other borehole array sites.

Xueliang Chen - One of the best experts on this subject based on the ideXlab platform.

  • inversion of waveforms from xiangtang borehole seismic array for Soil Dynamic Property
    Acta Seismologica Sinica, 2007
    Co-Authors: Xueliang Chen, Xing Jin, Xiaxin Tao, Yongxiang Wei
    Abstract:

    In order to understand the site Soil response of the Xiangtang borehole seismic array under real strong ground motion, reveal the site response, verify the technique of borehole exploration, and improve the precision of in-situ test and laboratory test, this paper presents a new approach, which is composed of two methods. One is the layered site seismic response method, whose layer transform matrix is always real. The other is a global-local optimization technique, which uses genetic algorithm (GA)-simplex method. An inversion of multi-component waveforms of P, SV and SH wave is carried out simultaneously. By inverting the records of three moderate and small earthquakes obtained from the Xiangtang borehole array (2#) site, the Soil Dynamic characteristic parameters, including P velocity, damping ratio and frequency-dependent coefficient b, which has not been given in previous literatures, are calculated. The results show that the Soil S wave velocity of the Xiangtang 2# borehole is generally greater than that obtained from the 1994 in-situ test, and is close to the velocity of the 3# borehole, which is more than 200 m away from the 2# borehole. Meanwhile, perceptible Soil nonlinear behavior under peak ground motion of about 60×10−2 m/s2 is detected by the inversion analysis. The presented method can be used for studying the Soil response of other borehole array sites.

Xing Jin - One of the best experts on this subject based on the ideXlab platform.

  • inversion of waveforms from xiangtang borehole seismic array for Soil Dynamic Property
    Acta Seismologica Sinica, 2007
    Co-Authors: Xueliang Chen, Xing Jin, Xiaxin Tao, Yongxiang Wei
    Abstract:

    In order to understand the site Soil response of the Xiangtang borehole seismic array under real strong ground motion, reveal the site response, verify the technique of borehole exploration, and improve the precision of in-situ test and laboratory test, this paper presents a new approach, which is composed of two methods. One is the layered site seismic response method, whose layer transform matrix is always real. The other is a global-local optimization technique, which uses genetic algorithm (GA)-simplex method. An inversion of multi-component waveforms of P, SV and SH wave is carried out simultaneously. By inverting the records of three moderate and small earthquakes obtained from the Xiangtang borehole array (2#) site, the Soil Dynamic characteristic parameters, including P velocity, damping ratio and frequency-dependent coefficient b, which has not been given in previous literatures, are calculated. The results show that the Soil S wave velocity of the Xiangtang 2# borehole is generally greater than that obtained from the 1994 in-situ test, and is close to the velocity of the 3# borehole, which is more than 200 m away from the 2# borehole. Meanwhile, perceptible Soil nonlinear behavior under peak ground motion of about 60×10−2 m/s2 is detected by the inversion analysis. The presented method can be used for studying the Soil response of other borehole array sites.

Shi Xiaojun - One of the best experts on this subject based on the ideXlab platform.

  • comparison of Soil Dynamic Property identification method
    Journal of Architecture and Civil Engineering, 2009
    Co-Authors: Shi Xiaojun
    Abstract:

    Combining free Soil shaking table test,the predominant frequency of silty clay and its damping ratio used in series of shaking table test were identified by three commonly used methods,i.e.the stochastic subspace identification(SSI) method,frequency domain decomposition(FDD) method and empirical mode decomposition plus Hilbert transform(EMD+HT) method.The applicabilities of the three methods were verified and identification results were discussed in items of effect of input type,different Soil depths and selection of calculating parameters concerning large damping ratio cases.The results show that the three methods are applicable for random excitation and small damping ratio cases;only empirical mode decomposition plus Hilbert transform method can produce reasonable results when Soil predominant frequency and damping ratios are coupled with vibration process or subjected to strong earthquake.