码头堆场地基强夯加固对邻近铁路桥振动影响的研究

Influence of Dynamic Compaction of Wharf Yard Foundation on the Vibration of Adjacent Railway Bridges

武汉港花山码头工程陆域堆场位于铁路专用线通过区域。为研究陆域堆场强夯对邻近铁路桥的影响,合理确定强夯工艺,结合强夯试验成果分析了夯能、夯击数、夯击距离与铁路桥振动之间的关系。现场测试采取4 500k N·m夯能时,强夯击数>5击后铁路桥桥面振动速度收敛至3.5 cm/s。采取6 000 k N·m夯能时,40 m以外的铁路桥桥面振动速度<4.0 cm/s,振动频率<10 Hz,满足《建筑工程容许振动标准》要求。依据试验成果推导出了黏土地基强夯引起的建筑物振动速度衰减规律方程,相关研究成果可为同类工程借鉴参考。

The land yard of Huashan wharf project of Wuhan Port is located in railway line area. To investigate into the influence of dynamic compaction on adjacent railway bridge,hence determining a reasonable compaction technique,we analyzed the relationship between tamping energy,tamping number,tamping distance and railway bridge vibration according to field compaction test.In field test,the vibration velocity of bridge floor converged to 3.5 cm/s when dynamic tamping energy was 4 500 k N·m after tamping number reached 5; the vibration velocity of bridge floor was smaller than 4.0 cm/s and vibration frequency less than 10 Hz when tamping energy amounted to 6 000 k N·m beyond 40 m,which meets the requirements of Standard for Allowable Vibration of Building Engineering. In addition,the equation of vibration velocity attenuation of buildings caused by clayey foundation compaction was deduced based on test results for reference for similar projects.