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为了研究冠梁约束型抗滑桩在振动作用下的抗震性能,以大型振动台试验为手段,对比研究了冠梁约束型抗滑桩和普通抗滑桩在不同El地震波作用下的动力响应,结果表明:(1)随着El波加速度峰值的不断增大,抗滑桩桩身放大系数增大及桩身动土压力随之增大。(2)由于冠梁的作用,使得冠梁约束型抗滑桩联合成整体受力,改变了抗滑桩结构的受力条件。(3)X向加载时,冠梁约束型抗滑桩桩顶放大系数相对于普通抗滑桩较大;Z向加载时,恰好相反;双向加载时,其桩顶放大系数的差值与峰值加速度相关。(4)随着振动的加剧,在基岩接触面可能产生新的剪切滑移线。(5)在振动作用下,El地震波峰值加速度不超过1.2g时,冠梁约束型抗滑桩抗震性能相对较好。该试验可为震区抗震设计提供参考。
In order to study the anti-seismic performance of the anti-slide piles with crown-beam constraint under vibration, the dynamic response of the anti-slide piles with crown-beam constraints and ordinary anti-slide piles under different El seismic waves is studied by means of a large-scale shaking table test. The results show that: (1) With the increasing of El wave acceleration peak, the enlargement coefficient of anti-slide pile and the increase of earth-moving pressure of pile body increase. (2) Due to the effect of the crown beam, the crown-beam constrained anti-slide pile combined into a whole body force, changing the stress conditions of the anti-slide pile structure. (3) In the X-direction loading, the coefficient of enlargement of the top of the crown-beam constrained anti-slide pile is larger than that of the ordinary anti-slide pile, while the opposite is the case in the Z-direction loading. Acceleration related. (4) With the increase of vibration, new shear slip lines may be generated at the bedrock contact surface. (5) When the peak acceleration of El seismic wave does not exceed 1.2g under the action of vibration, the anti-seismic performance of the anti-sliding pile with crown-beam constraint is relatively good. The test can provide reference for seismic design of earthquake zone.