摘要
建立动力打桩力学分析模型,是进行有效分析的重要基础。近年来PDA动测技术在锤击沉桩中的广泛应用以及采集的实测数据,简化了海利公式中ξ、η、c的取值问题,为完善锤击力学模型提供了帮助。然而长期以来,不论是海利公式还是其它分析模型,并未详细分析锤击系统中各结构件的弹性属性,仅是简单模糊的定义"桩土体系"总的弹性变形量,是其较大的缺陷。文章从分析动力打桩系统中各结构件的弹性属性切入,提出了特定系统内各结构件只有当刚度系数与载荷量级相匹配条件下,才属于"弹性元件"的概念,并以此为基础建立起更加贴近实际的锤击力学模型,揭示了动力打桩中力学现象的实质,同时获得了桩身弹性吸能的数值估算解。
The establishment of dynamic pile driving mechanics analysis model is an important foundation for effective analysis.In recent years,the wide application of PDA dynamic measurement technology in hammering pile and the collected measured data have simplified the value ofξ,η,c in Hailey formula,and provided help for perfecting the hammering mechanics model.However,for a long time,the elastic properties of each structural part in the system have not been analyzed in detail by either the Haley formula or other analytical models.It is only a simple and fuzzy definition of the total elastic deformation of the pile-soil system,which is a great defect.Based on the analysis of the elastic properties of each structural part in the dynamic piling system,the concept of"elastic element"is put forward only when the stiffness coefficient and the load magnitude match each structural part in a particular system.On this basis,a more practical hammer mechanics model is established,which reveals the essence of the mechanical phenomenon in dynamic pile driving,and obtains the numerical solution of the elastic energy absorption of the pile body.
作者
陆红
金文龙
王雪刚
林登
傅家林
LU Hong;JIN Wen-long;WANG Xue-gang;LIN Deng;FU Jia-lin(CCCC Fourth Harbor Design Institute Co.,Ltd.,Guangzhou,Guangdong 510230,China;CCCC Fourth Harbor Engineering Institute Co.,Ltd.,Guangzhou,Guangdong 510230,China;Zhejiang Yongan Machinery Co.,Ltd.,Wenzhou,Zhejiang 325204,China)
出处
《中国港湾建设》
2019年第11期22-26,共5页
China Harbour Engineering
关键词
动力打桩
载荷量级
刚度系数
弹性元件
模型
dynamic pile driving
load magnitude
stiffness coefficient
elastic element
model
