双桩承台基础动力测试应用研究  

RESEARCH ON DYNAMIC TESTING APPLICATION OF DOUBLE-PILE-CAP FOUNDATIONS

作　　者：张开伟 聂庆科[2,3] 李志勇[1] 韩文永 齐松松 张召彬 ZHANG Kaiwei;NIE Qingke;LI Zhiyong;HAN Wenyong;QI Songsong;ZHANG Zhaobin(Hebei Shuangcheng Construction Engineering Testing Co.,Ltd.,Shijiazhuang 050031,China;Hebei Research Institute of Construction&Geotechnical Investigation Co.,Ltd.,Shijiazhuang 050020,China;Hebei Research Center Geotechnical Engineering Technology,Shijiazhuang 050020,China)

机构地区：[1]河北双诚建筑工程检测有限公司,石家庄050031 [2]河北建设勘察研究院有限公司,石家庄050020 [3]河北省岩土工程技术研究中心,石家庄050020

出　　处：《工业建筑》2020年第8期80-84,共5页Industrial Construction

基　　金：河北省建设科技计划基金项目(2014-014号)。

摘　　要：大型动力机器基础、核电基础、陆地风电基础等基础结构都易受到机器扰力、地震作用、风荷载等动力作用的影响,在动力荷载作用下,运转机器的振动会引起地基基础的振动,这种振动会对地基产生不利影响,大幅降低地基的承载能力,导致地基基础出现差异沉降,影响机器的正常运转,乃致发生生产安全事故。双桩承台是这些基础中最常见的一种基础形式,结合实际试验项目设计了两组同样基础规格但不同布置方向的双桩承台基础,利用大功率机械式激振器分别对两台双桩承台基础在明置及埋置条件下进行竖向、水平回转向及扭转向基础动力振动测试,通过对测试结果的对比和进一步计算不同方向的双桩承台基础动力参数,结果显示虽然两台双桩承台基础规格一致但不同的结构布置方向会导致基础动力参数产生较大的差异,从而影响动力设备基础的设计,因此在双桩承台动力基础的设计中应当考虑基础布置的因素。The large-scale dynamic machine foundation,nuclear power foundation,land wind power foundation and other infrastructures are easily impacted by the machine disturbance,seismic action,wind load and other dynamic effects,under the action of dynamic load,vibrations of operating machines will cause vibrations of foundations,which will have great adverse impacts on foundations.It may greatly reduce the bearing capacity of foundation and lead to difference settlement of foundation,which may affect normal operation of machines,and might even cause serious accidents in severe cases.A double-pile cap foundation is one of the most common basic forms of these foundations.Combined with actual test projects,two groups of double-pile cap foundations with the same sizes and form but different layout directions were designed.Dynamic vibration characteristics of the two double-pile cap foundation under the action of the vertical,horizontal and torsional vibration were carried out by high-power mechanical vibration exciters under surface and embeded conditions,respectively,to compare the dynamic parameters of each double-pile cap foundation in different directions.The results showed that although the sizes and cap foundation shapes of for the two foundations were the same,but the different structural arrangement directions would have a great difference on dynamic parameters of foundations.The difference would affect design parameters of equipment foundations,so the direction arrangements of double-pile cap foundations should be considered in design of two-pile cap dynamic foundations.

关 键 词：双桩承台基础 基础动参数 明置基础 埋置基础 幅频响应曲线 

分 类 号：TU435[建筑科学—岩土工程]