非埋式桩板路基动力特性原位激振试验研究  

In-situ forced vibration tests on dynamic characteristics of non-embedded pile-board subgrade

作　　者：白皓[1,2,3] 苏谦[1,2,3] 黄俊杰[1,2,3] 郑键斌[1,2,3] 王迅[1,2,3] 

机构地区：[1]西南交通大学高速铁路线路工程教育部重点实验室,成都610031 [2]西南交通大学土木工程学院,成都610031 [3]西南交通大学道路工程四川省重点实验室,成都610031

出　　处：《岩土力学》2012年第12期3753-3759,共7页Rock and Soil Mechanics

基　　金：教育部高等学校博士学科点专项科研基金(No.20100184110016);西南交通大学道路工程四川省重点实验室开放研究基金资助课题(No.LHTE007201107)

摘　　要：非埋式桩板结构嵌入路基形成刚性路基结构体系,导致路基结构动态性能发生较大的变化,因此,有必要对其进行专门的原位激振试验研究。利用DTS-1动力试验系统,对郑西客运专线桩板路基试验段进行原位激振试验,测定路基各断面的振动响应、结构内力和累积沉降等,分析非埋式桩板路基的振动特性和动力稳定性。结果表明,非埋式桩板路基在激振频率范围内未发生共振现象,且具有良好的长期稳定性;桩板结构累积沉降主要是由承载板变形引起的,加载75×104次后基本上趋于稳定,加载100×104次后最大累积沉降为1.0 mm;非埋式桩板路基综合动刚度与板厚、跨度、桩基和桩周土等有关,由桩板结构、路堤和地基构成的刚性路基结构体系具有良好的振动特性和长期动力稳定性。In-situ vibration test of non-embedded pile-board subgrade needs to be carried out because this structure＇s dynamic characteristics are quite different from normal subgrade. DTS-1 dynamic test system is used to test the vibration response, internal force and settlement of a subgrade section in Zhengzhou-Xi＇an Passenger Dedicated Line. Result shows that sympathetic vibration will not happen in range of exciting frequency, and subgrade settlement mainly happens on loading plate and will be basically stable after 0.7 million times＇ loading with a final settlement of 1.0mm after 1 million times＇ loading. Comprehensive dynamic stiffness is related to thickness of board, span, piles and soil, which can provide well vibration characteristics and long-term dynamic stability for the combining structure of pile-board structure, subgrade and foundation.

关 键 词：非埋式桩板路基 动力试验系统 原位激振试验 振动特性 长期动力稳定性 

分 类 号：U213.1[交通运输工程—道路与铁道工程]