Abstract
To explore the optimal seismic performance of multianchor pile, we carried out a series of shaking table tests. Based on the special form of multianchor piles’ reinforcement, we put forward the optimal design scheme of using EPS foam as damping layers and energy-dissipation springs for improving the self-coordinating devices of anchor head. By measuring acceleration and dynamic soil-pressure response under different intensities of vibration, we analyzed the correlation between acceleration caused by seismic wave action and damage characterized by time-domain and spectral characteristics of dynamic soil-pressure. We discuss in detail the relationship between frequency and specific period of dynamic soil-pressure and acceleration. We then used the SPECTR program to calculate the energy spectrum. Under the reciprocating action of seismic waves of different intensities, our slope model showed the continuous effect of spatial coupling deformation leading to regional damage and failure. Furthermore, the spatial distribution for amplitude of acceleration and dynamic soil-pressure showed the outstanding response of lateral amplitude of pile structures without optimization. The energy-spectrum distribution of acceleration seismic input was orderly, while the dynamic soil-pressure distribution of piles was disordered. Low-frequency (≤10 Hz) seismic waves have a great influence on these structures. The difference of acceleration hysteresis along the elevations was mainly caused by the propagation stage after the main earthquake. The correlation between dynamic soil-pressure and acceleration response in each group before the pile occurred in the same earthquake area was very weak, showing a low correlation. The optimization effect of optimized structures is related to the position of the shock-absorbing layer. Under high acceleration, multianchor piles easily cause bulge failures or shear failures at the positions of sliding surfaces. These results are helpful for improvements to reliably optimize designs in pile structure dynamic parameters.
Highlights
Current plate-tectonic theory describes seismic activity in terms of high frequency, high intensity, shallow source, and wide distribution
Is indicates that side piles show a strong linear correlation between their response under low and medium accelerations. e correlation coefficient between 0.4 g and 1.4 g of ground-motion response is 0.18295; the greater the difference in the ground-motion response, the weaker the correlation coefficient. e correlation coefficient between 0.8 g and 1.4 g is 0.49941, and the correlation between responses in ground-motion acceleration is weak. e scatter diagram shows that the 95% binary normal density ellipse is circular and does not extend along the diagonal direction
We aimed to study dynamic soil-pressure and acceleration dynamic response’s spatial variations, in soil slopes strengthened using multianchor piles under earthquake conditions. e optimal seismic performance of the multianchored pile was discussed
Summary
Current plate-tectonic theory describes seismic activity in terms of high frequency, high intensity, shallow source, and wide distribution. Earthquakes and other natural disasters have become one of the great challenges that must be addressed globally [1]. China is located between the two famous seismic belts of the Pacific Rim and Europe and Asia. A large number of high filling and deep excavation slopes and natural mountain slopes in highway and railway traffic projects are scattered along moderate and strong earthquakes. E slope instability induced by earthquakes has become one of the typical causes of accidents in geotechnical engineering. Ey enhance the stability of a slope’s reinforcement but often become weak alone the seismic zones of fault lines. The consequences will be incalculable [2]
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