Slope seismic oscillation comprehensive risk assessment method considering gradient-incident angle-back-facing slope three-dimensional coupling

Abstract

The invention relates to the technical field of seismic engineering and geological disaster prevention and control, and discloses a slope seismic oscillation comprehensive risk assessment method considering gradient-incident angle-back-facing slope three-dimensional coupling, and the method comprises the steps: building a three-dimensional double-sided slope dynamic response model, laying monitoring points on a flat ground in front of a slope and slope surfaces at two sides, and carrying out the construction of a three-dimensional double-sided slope dynamic response model; setting free field boundaries around the model, inputting seismic waves subjected to polynomial baseline correction processing, and calculating peak acceleration amplification coefficients under the conditions of different gradients, incident angles and slope orientations; on the basis, a sensitive incident angle threshold weight and a back-facing slope asymmetric weight are introduced, a normalized amplification coefficient is combined, a gradient-incident angle-back-facing slope three-dimensional coupling comprehensive risk index is constructed, and unified quantification and grading evaluation of risk intensity under the conditions of different gradients, different incident angles and different slopes are achieved. The method can systematically reveal the coupling rule of the double-slope seismic oscillation amplification effect, and provides a scientific basis for the seismic design of mountainous engineering and regional seismic damage risk assessment.

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