1 Key Laboratory of Computational Geodynamics, Chinese Academy of Sciences, Beijing 100049, China 2 College of Earth Science, University of Chinese Academy of Sciences, Beijing 100049, China 3 North China Institute of Geological Engineering Co. Ltd., Beijing 100085, China 4 Geogiga Technology Corp., Calgary T3A5P2, Canada
Application of passive source surface-wave method in site engineering seismic survey
1 Key Laboratory of Computational Geodynamics, Chinese Academy of Sciences, Beijing 100049, China 2 College of Earth Science, University of Chinese Academy of Sciences, Beijing 100049, China 3 North China Institute of Geological Engineering Co. Ltd., Beijing 100085, China 4 Geogiga Technology Corp., Calgary T3A5P2, Canada
摘要Site engineering seismic survey provides basic data for seismic effect analysis. As an important parameter of soil, shear-wave velocity is usually obtained through wave velocity testing in borehole. In this paper, the passive source surface-wave method is introduced into the site engineering seismic survey and practically applied in an engineering site of Shijingshan District. By recording the ubiquitous weak vibration on the earth surface, extract the dispersion curve from the surface-wave components using the SPAC method and obtain the shear-wave velocity structure from inversion. Over the depth of 42 m underground, it totally consists of five layers with interface depth of 3.31, 4.50, 7.23, 17.41, and 42.00 m; and shear-wave velocity of 144.0, 198.3, 339.4, 744.2, and 903.7 m/s, respectively. The inversion result is used to evaluate site classification, determine the maximum shear modulus of soil, provide basis for further seismic hazard analysis and site assessment or site zoning, etc. The result shows that the passive source surface-wave method is feasible in the site engineering seismic survey and can replace boreholes, shorten survey period, and reduce engineering cost to some extent.
Abstract：Site engineering seismic survey provides basic data for seismic effect analysis. As an important parameter of soil, shear-wave velocity is usually obtained through wave velocity testing in borehole. In this paper, the passive source surface-wave method is introduced into the site engineering seismic survey and practically applied in an engineering site of Shijingshan District. By recording the ubiquitous weak vibration on the earth surface, extract the dispersion curve from the surface-wave components using the SPAC method and obtain the shear-wave velocity structure from inversion. Over the depth of 42 m underground, it totally consists of five layers with interface depth of 3.31, 4.50, 7.23, 17.41, and 42.00 m; and shear-wave velocity of 144.0, 198.3, 339.4, 744.2, and 903.7 m/s, respectively. The inversion result is used to evaluate site classification, determine the maximum shear modulus of soil, provide basis for further seismic hazard analysis and site assessment or site zoning, etc. The result shows that the passive source surface-wave method is feasible in the site engineering seismic survey and can replace boreholes, shorten survey period, and reduce engineering cost to some extent.
基金资助:National Natural Science Foundation of China (No. 41174085), Chinese Academy of Sciences (KZZD-EW-TZ-19), and China Geological Survey (12120113101400)
通讯作者:
Jian Zhang
E-mail: zhangjian@ucas.ac.cn
引用本文:
Chaofan Wang, Jian Zhang, Lihui Yan, Hui Liu, Dong Zhao. Application of passive source surface-wave method in site engineering seismic survey[J]. 《地震学报》英文版, 2014, 27(1): 101-106.
Chaofan Wang, Jian Zhang, Lihui Yan, Hui Liu, Dong Zhao. Application of passive source surface-wave method in site engineering seismic survey. Earthquake Science, 2014, 27(1): 101-106.
