土质边坡微型桩组合结构大型振动台试验研究

我国是一个地震多发国家。微型桩组合结构作为一种新型柔性支护结构，研究其在地震作用下对土质边坡的支护作用成为了一个意义重大的问题。为此，通过大型振动台试验，以混合加载的方式，研究了微型桩组合结构在加固土质边坡中的动力学特性。试验结果表明：微型桩组合结构在地震作用下对土质边坡的加固达到了理想的结果；加载时随着El波加速度峰值的不断增大，前、后排微型桩桩身加速度峰值及桩身动土压力随之不断增大；随着输入的El-Centro波动峰值加速度的增大，测点动土压力响应效应也越显著；微型桩滑面上、下1/3位置、悬臂端顶部及锚固段底部处，动土压力及加速度常常达到最大值，在实际工程设计及应用中应重点关注这些位置。该研究结果可以为同类地区治理类似滑坡提供抗震设计支撑。

Large-scale shaking table test on micro-pile composite structure on soil slope

China is an earthquake-prone country. The micro-pile composite structure is a new type of flexible supporting structure, and its supporting effect on the soil slope under the earthquake action has become a significant problem. Therefore, the dynamic characteristics of the micro-pile composite structure on the reinforced soil slope were studied by large-scale shaking table test under mixed loading. The test results demonstrate that the micro-pile composite structure achieves an ideal effect on the reinforcement of the soil slope under the earthquake action. With the increase of the peak value of the El wave acceleration, the peak acceleration and the dynamic pressure of the pile body in the front and back rows increase gradually. With the increase of the peak value of the input El-Centro acceleration, the response effect of the soil pressure is also more significant. The earth pressure and acceleration often reach the maximum values at the upper and lower 1/3 positions of the slide surface, the top of the cantilever end and the bottom of the anchorage section, which should be paid attention to these positions in practical engineering design and application. The research results can provide support for the seismic design of similar landslides in similar areas.