Abstract
In this paper, a pseudostatic seismic coefficient evaluation method for slope dynamic stability analysis was explored with Yushu Airport Road 3# landslide as a typical engineering case, and the shaking table test and numerical calculation were performed during the exploration. The loading waveform was selected as Yushu wave, and the acceleration time-history of seismic waves was measured and analyzed, revealing the failure mode of slopes. Based on the rigid-body limit equilibrium theory, the instantaneous additional seismic forces of each block and the time-history landslide stability coefficient were calculated. According to the time-history of the landslide, dynamic stability coefficients were calculated. Subsequently, we proposed a pseudostatic seismic coefficient evaluation method and discussed the seismic coefficient slope dynamic stability analysis. The results showed that as the vibration frequency rose, the average acceleration and the residual displacement of the slope decreased, but the slope grew more dynamically stable. With the proposed method, we calculated the period of slope seismic action to be 0.126 s and the average maximum acceleration to be 0.156 g, which was close to the designed ground motion acceleration of 0.15 g. Besides, we calculated the safety factor of landslides under earthquake to be 0.93∼0.97, which was close to that obtained from the building code method and in accordance with the present seismic deformation and failure mode of landslides. Moreover, the results obtained from the method of nuclear power plant specification were relatively small compared to other specification methods. The research is significant because it provides a new idea for the evaluation of seismic landslide stability in practical engineering.
Highlights
Slope stability involves many engineering fields, including geotechnical engineering, road and bridge engineering, mine engineering, and construction engineering [1]
Based on the rigid-body limit equilibrium theory, the instantaneous additional seismic forces in each block and the landslide stability coefficient were calculated, and we proposed and discussed a pseudostatic seismic coefficient evaluation method for slope dynamic stability analysis
Calculation of the Seismic Coefficient of Ground Motion Time-History. e dynamic time-history measured by the shaking table test showed that the vibration frequency of simple harmonics had a significant positive impact on slope stability. e residual displacement of the slope dropped obviously with higher vibration frequencies, indicating a significant increase in the slope stability
Summary
Slope stability involves many engineering fields, including geotechnical engineering, road and bridge engineering, mine engineering, and construction engineering [1]. In an applied research of the slope field, Utili and Abd [7] analyzed the influence of vertical acceleration directions on slope stability based on the upper bound theorem of limit analysis and the pseudostatic method, and they determined the yield seismic coefficients. Based on the rigid-body limit equilibrium theory, the instantaneous additional seismic forces in each block and the landslide stability coefficient were calculated, and we proposed and discussed a pseudostatic seismic coefficient evaluation method for slope dynamic stability analysis. E cracks in the back edge of the landslide were dense with a total width of 20 m, an extension length of 50 m, an average width of individual cracks of 20 cm–30 cm, and a measurable depth of Figure 2: Regional geological structure and seismic distribution map of Yushu. Its lithology was predominantly grey limestone with a small amount of slate and sandstone. e bedding was obvious, and the joints were developed. e main bedding was 220° ∠ 41°. e rock strata were outcropped on both sides of the Batang River with good stability
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