铁路路基混凝土排桩隔振效果模型试验研究  

Model Test Study on Vibration Isolation Effect of Concrete Piles in Rows for Railway Subgrade

作　　者：侯恩品 刘晶磊[1] 张瑞恒[1] 王一峰[1] 冯桂帅 HOU Enpin LIU Jinglei ZHANG Ruiheng WANG Yifeng FENG Guishuai(School of Civil Engineering, Hebei University of Architecture, Zhangjiakou Hebei 075000, Chin)

机构地区：[1]河北建筑工程学院土木工程学院,河北张家口075000

出　　处：《铁道建筑》2017年第3期141-145,共5页Railway Engineering

基　　金：河北省青年拔尖人才计划(BJ2016018);张家口市科技局科技计划(1511074B)

摘　　要：为了研究铁路路基混凝土排桩的隔振效果,通过模型试验方式,在模型试验箱中设置混凝土排桩作为土中障碍物,考虑桩截面尺寸、桩深度及桩间距因素,以加速度衰减率及振幅降低比来评价混凝土排桩隔振效果和影响其效果的因素。结果表明:混凝土排桩隔振效果显著,设置混凝土排桩可使桩后土体加速度衰减率达到47.8%~70.4%;单桩截面尺寸对隔振效果影响不明显,不同尺寸条件下加速度衰减率在1.5%~9.8%;桩深度增加对距振源一定距离处隔振效果影响比较显著,桩深度变化引起的加速度衰减率在18.3%~56.3%;随着桩间距增大,单排桩隔振效果降低。In order to study the vibration isolation effect of concrete piles in rows for railway subgrade, concrete piles in rows were set in the model test box as the obstacle in the soil. Considering the pile section size, pile depth and pile spacing, the acceleration attenuator rate and the amplitude reduction ratio were used to evaluate the vibration isolation effect of concrete piles in rows and its influencing factors. The results show that the vibration isolation effect of the concrete piles in rows is remarkable, and the acceleration attenuator rate of the post-pile soil can reach 47.8% -70.4%. The influence of the section size of single pile on the vibration isolation effect is not obvious, the acceleration attenuator rate under the different size condition is in the range of 1.5% -9.8%. The pile depth increase can significantly affect the effect of vibration isolation in a certain distance from source, and the acceleration attenuator rate caused by pile depth increase is about 18.3 % - 56.3 %. With the increase of pile spacing, vibration effect of concrete piles in single row is reduced.

关 键 词：铁路路基 排桩隔振 混凝土排桩 模型试验 加速度衰减率 振幅降低比 

分 类 号：TU435[建筑科学—岩土工程]