Seismic Response Evaluation of High-Steep Slopes Supported by Anti-Slide Piles with Different Initial Damage Based on Shaking Table Test

Abstract

In order to study the instability development process of the slope reinforced by anti-slide piles under earthquake conditions, the dynamic response characteristics of the slope are usually taken as the main characteristics, and the model test and numerical simulation are the main research methods. In this paper, a shaking table model test is designed and completed to investigate the influence of anti-slide piles with different initial damage on the failure mode of high and steep slope under earthquake conditions. The changes in velocity, strain and natural frequency during slope vibration are tested in combination with cloud maps when sinusoidal waves of different accelerations with a peak value of 5 Hz are applied. Thus, the differences of slope failure development process and dynamic response characteristics are obtained. The experimental results show that the anti-slide pile with different initial damage has obvious influence on the slope instability process. Under the condition of good anti-slide pile quality, the failure development of the slope behind the pile is limited to soil sliding on top of the slope, slope sliding and overburden sliding; the front slope foot of pile mainly forms shear belt and local sliding. With the decrease in the initial mass of the anti-slide pile, the slope failure develops into topsoil sliding, slope sliding and deep integral sliding; analogously, the failure of the slope in front of the pile develops into a whole slip along the slip belt. The natural frequency cloud map can directly reflect the damage location of the slope, and the frequency change rate is positively correlated with the cumulative shear strain. It shows that the macro-failure characteristics of the model slope change well when the natural frequency is used as the sensitive index to measure the influence of vibration on the model slope. The threshold value of the natural frequency change rate can distinguish different development stages of the slope; 1% is the threshold value of stage II, and 1.5% is the threshold value of stage III.

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

“…The study also noted that the maximum lateral earth pressure exerted on the slope toe anti-sliding pile's back is considerably greater than that exerted on the slope waist anti-sliding pile's back, indicating a load-sharing ratio that fluctuates between 2 and 5. A related study by Chen et al [138] examined the impact of anti-slide piles exhibiting varying degrees of initial damage on the mechanisms of failure of steep and high slopes subjected to seismic loads. Research outcomes indicated that the deterioration of the slope behind high-quality anti-slide piles was limited to soil sliding on the slope's upper surface, slope sliding, and overburden sliding.…”

“…In terms of reinforcement applications, we note that insufficient attention is given to the performance of slopes reinforced with multiple anti-slide piles undergoing deterioration due to repeated seismic loads. One of the few studies was conducted by Chen et al [138]. The cumulative influence of the structurally damaged piles on slope stability over time needs to be quantified for the purpose of monitoring overall slope stability.…”

Impact on slopes with development of shear band

“…The recent studies direct that slope failure due to accumulation of strain found very commonly in slopes [14][15][16][17][18]. This aspect of behavior motivates to study the response of soil mass during slope failure.…”

“…It was concluded that deformation of shear band significantly depends on the confining pressure and moisture content. Chen et al (2022) [15] conducted experimental and analytical approach for an embankment slope under seismic excitation to evaluate the peak ground amplification factor using PLAXIS, FEM. The numerical results were in good agreement with experimental results.…”

Stability Analysis and the Random Response of Anti-Sliding Pile for Erdaogou Landslide Considering Spatial Variability

“…As a common geological hazard, landslides pose a significant threat to human life [1][2][3]. Considering the complex nature of this medium, previous studies have revealed that the spatial variability of rock and soil mass has an impact on the evolution of landslides [4].…”