钢箱边界效应振动台试验研究
Shaking table test on boundary effect of steel box for pile-soil interaction research

为分析桩的动力响应和钢箱的边界效应，设计一个带有泡沫边界、滑动边界以及摩擦边界的钢箱，并进行桩土相互作用的振动台试验. 试验结果表明：1） 惯性效应作用下，桩顶的地震响应最大；2） 钢箱不同埋深处，地震响应不一，底部最小，中部大于底部和上部；3） 泡沫边界会影响土体内介质的加速度响应—无泡沫边界情况下土体内介质的加速度响应偏大. 所以，在进行桩土动力相互作用的振动台试验时建议增设泡沫边界.
In order to analyze the dynamic response of pile and the boundary effect of steel box for pile soil interaction research，shaking table test was carried out with a sand-contained steel box with foam boundaries inside of two sides of sliding boundaries and another two sides of friction boundaries，respectively. Test results show that：1) the largest seismic response is in pile head due to the effect of inertia；2) Seismic response is different in various embedded depth，with the smallest in bottom and the larger in central than in bottom and top；3) Foam boundary affects the acceleration response of particles inside soil with less response than the case with no foam boundary. Therefore，foam boundary is required in shaking table test of pile-soil interaction research