基于迁移颗粒振动能量的粒料基层填料压实质量评价

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中文摘要：目前,粒料基层振动碾压质量评价指标多基于振动轮的动力响应,鲜有研究考虑粒料基层填料自身的振动信号.依托新建铁路砂土路基填筑碾压现场试验段,开展动态变形模量测试,采用无线智能颗粒传感器实时监测振动碾压过程中填料颗粒的迁移运动,进而分析三向加速度及其边际谱能量随碾压遍数的变化规律;基于迁移颗粒的边际谱振动能量幅值,提出新的压实指标:迁移颗粒振动能量压实值(migrating particle vibration energy compaction value,MPVECV),并分析其与碾压遍数和动态变形模量之间的关联性,探究振动模式、碾压速度及监测位置对新压实指标评价效果的影响程度.研究结果表明:振动碾压过程中粒料基层填料颗粒存在多方向的振动效应,进而促使填料不断运动致密,上部振动轮输出能量驱使填料内部颗粒不断小幅运动和调整直至整体稳定.传感器的加速度边际谱幅值与振动碾压遍数以及动态变形模量的关联性较好;迁移颗粒平行于行车方向的MPVECV指标相比于其在垂直于行车方向及竖直方向的MPVECV指标可更好地表征粒料基层填料的压实质量和动态变形模量,因此可用其评价填料的压实状态.MPVECV指标更适用于强振工况且其评价效果受碾压速度和监测位置的影响并不显著.研究结果可为粒料基层填料智能压实提供实时、无损的评价指标和技术.

外文标题：Compaction quality evaluation of coarse-grained embankment fill materials based on vibration energy of migrating particles

外文摘要：The current compaction quality evaluation methods for coarse-grained embankment fill materials primarily focus on the dynamic responses of the vibratory roller compactor,but neglect the vibration signals of the coarse-grained embankment fill materials.Through field roller compaction tests on a new railway embankment section of sand fill materials,dynamic deformation modulus tests were conducted.And the wireless intelligent particle sensors were employed to monitor the migration of unbound aggregate particles during vibratory roller compaction.The variation patterns of three-dimensional (3D) accelerations and marginal spectral energy of migrating particles with the number of roller passes were analyzed.An innovative compaction index,defined as migrating particle vibration energy compaction value (MPVECV),was proposed based on the marginal spectral vibration energy amplitude of migrating particles.The correlations among the MPVECV index,the number of roller passes,and dynamic deformation modulus were investigated,while the influences of vibration mode,rolling speed,and monitoring positions on the evaluation effectiveness of the MPVECV index were explored.The results are drawn as follows.There is a multi-directional vibration effect inside the coarse-grained embankment fill materials during the process of vibration rolling,which promotes the continuous motion of the fill materials.The output energy generated by the upper vibration rollers facilitates minimal movement and adjustment among the internal particles within the packing material,gradually resulting in an overall equilibrium and structural stability.The marginal acceleration spectrum amplitude of the SR sensors is well correlated with both the number of vibratory roller applications and the dynamic deformation modulus.The MPVECV index parallel to the driving direction of migrating particles can better represent the compaction quality and dynamic deformation modulus of the coarse-grained embankment fill materials as compared to the MPVECV index perpendicular to the driving direction and vertical direction.Therefore,it can be potentially used to evaluate the compaction state of the coarse-grained embankment fill material.The MPVECV index is particularly suitable for high vibration mode,and its evaluation effectiveness is negligibly affected by rolling speed and monitoring positions.The researches can offer a real-time and non-destructive evaluation index and technology for intelligent compaction of coarse-grained embankment fill materials.

外文关键词：

subgrade engineeringcoarse-grained embankment fill materialsvibratory compactioncompaction quality evaluationparticle migration movementsmart sensing and monitoringdynamic deformation modulus

作者：

王萌、肖源杰、孔坤锋、于群丁、李文奇、杨涛、陈晓斌、陈宇亮

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作者单位：

中南大学土木工程学院,湖南长沙 410075

重载铁路工程结构教育部重点实验室(中南大学),湖南长沙 410075

中国铁道科学研究院集团有限公司铁道建筑研究所,北京 100081

中铁第四勘察设计院集团有限公司城市轨道与地下工程设计研究院,湖北武汉 430063

湖南省交通科学研究院有限公司,湖南长沙 410015

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关键词：

路基工程粒料基层填料振动压实压实质量评价颗粒迁移运动智能传感监测动态变形模量

基金：

国家自然科学基金资助项目国家自然科学基金资助项目国家自然科学基金资助项目国家重点研发计划项目湖南省自然科学基金杰出青年基金资助项目

项目编号：

52178443U1934209518786732019YFC19047042024JJ2073

出版年：

2024

DOI：

10.19713/j.cnki.43-1423/u.T20231918

铁道科学与工程学报

中南大学中国铁道学会

铁道科学与工程学报

CSTPCD北大核心EI

影响因子：0.837

ISSN：1672-7029

年,卷(期)：2024.21(9)

参考文献量11