›› 2017, Vol. 38 ›› Issue (4): 1052-1059.doi: 10.16285/j.rsm.2017.04.016

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Research on transfer function of bedding rock slope with soft interlayers and its application

FAN Gang1, 2, ZHANG Jian-jing1, 2 , FU Xiao1, 2   

  1. 1. Department of Geotechnical Engineering, School of Civil Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China; 2. Key Laboratory of Transportation Tunnel Engineering of Ministry of Education, Southwest Jiaotong University, Chengdu, Sichuan 610031, China
  • Received:2015-04-22 Online:2017-04-11 Published:2018-06-05
  • Supported by:

    This work was supported by the Research Program of Ministry of Transport of the People's Republic of China (2013318800020) and the National Program on Key Basic Research Project of China (973 Program) (2011CB013605).

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Abstract: A large scale shaking table test was conducted on the bedding rock slope with soft interlayers in this paper. Based on the transfer function theory, we analyzes the relative transfer function and absolute transfer function of this slope. The effect of these two kinds of transfer function on function characteristics and the calculation of seismic parameters is studied. The feasibility and accuracy of estimating the frequency domain response by the transfer function is also analyzed. The results show that the transfer functions calculated by the acceleration near slope face and in the middle of slope body have similar form, and there is small amplitude difference. The real part of relative transfer function is less 1 than that of absolute transfer function. The imaginary part of two kinds of transfer function is the same, and both sides of imaginary part have a high degree of symmetry. Thus seismic parameters calculated by the imaginary part have high accuracy. When the frequency is greater than 10 Hz, the module of relative transfer function is close to 1, while the module of absolute transfer function is approximately 0. The natural frequency obtained by the imaginary part is similar to that calculated by the module of relative transfer function. The damping ratios calculated by the modules of relative and absolute transfer functions are accurate. This study shows that the damping ratio of bedding rock slope with soft interlayers is lager than that of homogenous rock slope. The acceleration mode calculated by the imaginary part is the same as that by module of two kinds of transfer function. The estimation of frequency domain seismic response of bedding rock slope with soft interlayers by absolute transfer function is more accurate than relative transfer function. The correction of spectral characteristics for input ground motion can guarantee the reasonable mechanism of input ground motion on dynamic response of bedding rock slope with soft interlayers.

Key words: soft interlayer, bedding, rock slope, transfer function, shaking table test

CLC Number: 

  • TU 457

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