Study on Seismic Coefficient Calculation Method of Slope Seismic Stability Analysis

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.

A Systematic Review of Physical Modelling Techniques, Developments and Applications in Slope Stability Analyses

“…Surprisingly, not every study on physical modelling has adopted similitude laws. For example, Linfang et al [96] proposed a novel method for estimating slope seismic stability analysis using the Yushu Airport Road 3# landslide as a case study. Similarly, Murao et al [97] used shaking table tests to examine the progressive failure of unsaturated slopes in investigating the influence of seepage surface conditions on the fill slope.…”

Seismic reliability analysis of slope in spatially variable soils using multiple response surfaces

“…Due to the randomness and occasionality of earthquake, a seismic acceleration record corresponding to the specified earthquake type, site type and earthquake intensity is artificially produced as ground motion input (Tao et al. , 2017; Pai et al. , 2021).…”

“…Due to the randomness and occasionality of earthquake, a seismic acceleration record corresponding to the specified earthquake type, site type and earthquake intensity is artificially produced as ground motion input (Tao et al, 2017;Pai et al, 2021). Artificial earthquake is required to meet a given target response spectrum, that is, there is a basic control condition for the synthesis of artificial earthquake, and the simulation results are required to be in good agreement with the target response spectrum, as shown in Figure 4(a) (Zhang et al, 2016a;Gao and Feng, 2022).…”