应用混凝土异型桩的地铁隔振交互试验研究

为了研究地铁应用混凝土异型桩的减隔振效果,通过在地铁与建筑物之间设置混凝土异型桩进行减隔振缩尺模型交互试验,以振源深度、混凝土异型桩空心率以及其外截面形式3个因素为变量,分析了在地铁振动激励作用下建筑物各层竖向及水平向振动形态变化情况。结果表明：建筑物在地铁振动作用下,各楼层振幅降低比的大小呈现波浪形振动性态；混凝土异型桩具有明显减隔振效果,其中最优组合振幅降低比Ar为0.40,预期减振幅度可达59.58%；考虑影响减隔振效果的三因素以及因素之间的交互作用,其影响程度为：振源深度与空心率的交互作用影响高度显著；混凝土桩截面形式影响显著；空心率、振源深度及空心率与截面形式交互作用对试验结果有影响但影响不大。

Cross Experiment on Vibration Isolation of Subway Applied with Special-shaped Concrete Piles

In order to investigate the vibration isolation effect of the special-shaped concrete piles applied between the subway and the adjacent building, a cross model experiment involved three factors, which are depth of vibration source, the hollow ratio of piles and the outer cross section was conducted. Meanwhile, being affected by the vibration of the subway, changes of perpendicular and horizontal modes of each building are analyzed. Experimental results show that the amplitude reduction ratio level of each floor of building presents a wavy condition under the vibration generated by subway; The concrete special-shaped piles have obvious effects on vibration reduction, which the optimal combination of amplitude reduction ratio Ar is 0.4 and anticipate results can be reached 59.58%; Consider three factors which influence the effect of vibration reduction and interaction between three factors, which could be as arranged the interaction between the depth of vibration source and hollow rate have great impact on the vibration isolation effect, and Concrete piles cross section form has significant impact, but there is little effect on the test results, which are hollow rate, vibration depth and the interaction between section form and hollow rate.