| 非埋式桩板路基动力特性原位激振试验研究 |
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| 引用本文： | 白皓,苏谦,黄俊杰,郑键斌,王迅.非埋式桩板路基动力特性原位激振试验研究[J].岩土力学,2012,33(12):3753-3759. |
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| 作者姓名： | 白皓 苏谦 黄俊杰 郑键斌 王迅 |
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| 作者单位： | 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 |
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| 基金项目： | 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) |
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| 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。
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| 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 |
| 收稿时间： | 2012-05-19 |
In-situ forced vibration tests on dynamic characteristics of non-embedded pile-board subgrade |
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| BAI Hao,SU Qian,HUANG Jun-jie,ZHENG Jian-bin,WANG Xun.In-situ forced vibration tests on dynamic characteristics of non-embedded pile-board subgrade[J].Rock and Soil Mechanics,2012,33(12):3753-3759. |
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| Authors: | BAI Hao SU Qian HUANG Jun-jie ZHENG Jian-bin WANG Xun |
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| Institution: | 1. MOE Key Laboratory of High-Speed Railway Engineering, Southwest Jiaotong University, Chengdu 610031, China; 2. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China; 3. Key Laboratory of Highway Engineering of Sichuan Province, Southwest Jiaotong University, Chengdu 610031, China |
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| Abstract: | 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. |
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| Keywords: | non-embedded pile-board subgrade dynamic test system in-situ vibration test vibration characteristics long-term dynamic stability |
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