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关键词： Landslides  

摘要： Based on the microtremor data of Shenjiabao slope site in Beichuan, this paper uses the horizontal-to-vertical spectral ratio method (HVSR method) was used to explore the seismic effect characteristics of slope site. The results show that: (1) The HVSR curve of Shenjiabao slope site is mainly bimodal or multimodal. The peak frequency of the stratum is concentrated in 1.39 Hz ~ 3.90 Hz, and the amplification coefficient corresponding to the peak frequency is between 1.89 and 3.80, showing a relativelymore obvious local topographic amplification effect. (2) The dominant directions of microtremors at the top and waist of Shenjiabao slope are easy to distinguish, which are 30° ~ 80° and 110° ~ 160° respectively. When the peak frequency of multiple measuring points in a certain area tends to be consistent, the directional distribution is also more concentrated, which reveals the control effect of the underlying stratum structure change on the directional characteristics of the site soil layer. (3) The dominant direction of the joint occurrence of the Shenjiabao slope is 60° ~ 80°, which is in good agreement with the dominant direction of the ground pulsation at the top of the slope (30° ~ 80°), but it intersects with the slope strike (110°) at an acute angle. Compared with the seismic effect characteristics of the Wangjiayan landslide site, the layout of the anti-slide pile at the front edge of the Shenjiabao slope is an important factor in blocking the formation of the landslide. The research results provide a reference for exploring the seismic effect of slope sites and the prevention and control of slope disasters. © 2025 Chinese Vibration Engineering Society. All rights reserved.