高速铁路连续隔振措施减隔振效果试验研究
The research on the model test of the effect of vibration isolation about continuous vibration isolation measures in high speed railway

为了研究连续隔振措施减隔振效果及对不同措施减隔振效果进行比较分析，通过在模型箱内布设不同连续隔振措施，以土体表面加速度作为评价标准，分别研究空沟和橡胶颗粒、沙、碎石填充沟减隔振效果。研究结果表明：土体表面加速度随距离振源增大而减小，较近处衰减比较快，随着频率增加相应位置加速度减小；空沟减隔振效果明显，其深度影响显著，而宽度对其效果影响不大；橡胶颗粒、碎石填充沟减隔振效果不显著；沙子填充沟对波的阻隔效果较强，随着沙密度增加减隔振效果增强；几种隔振措施优劣顺序为空沟、沙填充沟、橡胶颗粒填充沟和碎石填充沟。
In order to study the effect of vibration isolation of continuous vibration isolation measures and to analyze the vibration isolation effect of different measures, the different continuous vibration isolation measures were set in the model test case and the acceleration of surface soil was employed as the evaluation standard. The effect of vibration isolation was studied with respect to the empty trench, rubber granular filling trench, sand filling trench、gravel filling trench. The results indicate that: With increasing distance from source the acceleration of soil surface decreases, and the acceleration attenuation is faster in the nearer. With the increase of frequency, the acceleration decreases accordingly. The reducing vibration isolation effect of empty trench is obvious, and the depth of open trench is a critical element influencing the effect of vibration reduction, while the width of open trench has less effect on vibration reduction; The reducing vibration isolation effect of granular filling trench and gravel filling trench is not significant; It is obvious about the reducing vibration isolation effect about sand filling trench, and the reducing vibration isolation effect is enhanced with the increase of sand density; The sort order of reducing vibration isolation effect about several measures is the empty trench, sand filling trench, rubber granular filling trench, gravel filling trench