抗滑桩加固边坡地震响应离心模型试验

为研究抗滑桩加固边坡的地震响应和桩土相互作用规律,利用土工离心机及专用振动台进行了砂土边坡的动力离心模型试验。在50g离心加速度条件下,输入El Centro地震波,记录了边坡不同位置的加速度时程并作频谱分析,采集了桩前动土压力和抗滑桩应变等。结果表明:边坡的地震动力响应自下而上逐渐放大;抗滑桩对周围土体响应有一定阻滞作用;桩前动土压力随着地震输入而迅速增大至峰值,此后保持稳定直至地震结束;抗滑桩各截面弯矩的变化规律与动土压力类似,弯矩最大值出现在抗滑桩下部。

Centrifuge modeling of seismic behavior of slopes reinforced by stabilizing pile

Centrifuge model tests on sand slopes were carried out on a centrifuge shaking table to investigate the seismic behavior of pile-reinforced slope and soil-pile interaction.The adjusted El Centro earthquake was excited as the input motion under 50g centrifugal accelerations.Acceleration time histories at different locations were recorded and analyzed in the frequency domain.Dynamic soil pressure and vertical strain along the piles were also recorded.It was indicated that the seismic response of the slopes was amplified as the earthquake motion propagated upwards.The response of adjacent soil was impeded by stabilizing piles to a certain degree.Along with the excitation of earthquake motion,the dynamic soil pressure rapidly increased to the peak value and then kept roughly stable until the end of the motion.The bending moment of the piles performed similar variation and the maximum moment occurred at the lower section of the piles.