轨道交通路基段减隔振屏障的模型试验研究

为了研究不同因素对屏障减隔振效果的影响,通过模型试验得到300 Hz内10 Hz整数倍的不同频率简谐荷载引起的振动波在地表的传播衰减规律,并对比分析无屏障及钢筋混凝土板、泡沫塑料板、非连续空井排、连续空井排、不同排距排桩、不同排数排桩等不同减隔振屏障措施的减隔振效果。试验结果表明:钢筋混凝土板屏障的减隔振效果最好;非连续空井排屏障与排桩屏障的减隔振效果无明显差异;当桩距固定为1.5倍桩径,调整排距至2.5倍桩径时,排桩屏障的减隔振效果最佳;排数越多,排桩屏障的减隔振效果越好;在各类减隔振屏障后均存在一定范围的振动隔离区,在振动隔离区范围外,屏障的减隔振效果消失。

Model Test Investigation on Vibration Isolation Barriers Applied to Subgrade of Rail Transit

In order to study the effect of different factors on the function of vibration isolation barriers,model test is performed to obtain the transmission and attenuation rules of the vibration wave on the ground caused by harmonic loads of different frequencies with integral multiples of 10 Hz within 300 Hz.The functions of some vibration isolation barriers are compared and analyzed in the cases of barrierfree,reinforced concrete slab,foam plastic slab,discontinuous row wells,continuous row wells,row piles with different row spacing and different rows.The results show that reinforced concrete slab barrier works best. The functions of the discontinuous row wells barrier and row piles barrier are much the same. If the pile spacing is 1. 5 times of the pile diameter and the row spacing is 2. 5 times of the pile diameter.,row piles barrier work best,The more the rows of pile,the better effect of the row pile. There is vibration isolation zone behind each kind of barrier,and the barrier loses its function out of the zone.