桩帽垫层对锤击沉桩的影响数值分析  

Numerical Analysis of Influence of Pile Cap Cushion on Driving Pile

作　　者：王继成[1] 倪占东[1] 柳爱[1] 周向阳[1] 

机构地区：[1]浙江台州职业技术学院,台州市318000

出　　处：《公路》2011年第4期74-77,共4页Highway

基　　金：浙江省教育厅科研项目;项目编号Y200909687

摘　　要：为了研究桩帽垫层对锤击沉桩效果的影响,采用有限元软件ABAQUS对弹性桩帽垫层和硬木垫层进行了模拟,发现弹性垫层在锤击过程中可显著降低桩身应力,而硬木板降低桩身应力的能力有限。采用合适厚度、刚度的垫层时,可显著增加贯入度。锤击能、垫层厚度、垫层刚度之间存在一定关系。对于某一垫层刚度,存在一最优垫层厚度,垫层刚度增加,最优垫层厚度范围也增加了。厚度较厚、刚度稍大的垫层能取得较好的沉桩效果。Elastic pile cap cushion and hardwood cushion are simulated by ABAQUS,the famous finite element software,in order to study the influence of pile cap cushion on driving pile in this paper.It is discovered that elastic cushion can reduce the stress of the driven pile evidently during the driving process,but the capacity of reducing the pile stress of hardwood is poor.The penetration can be increased greatly with suitable thickness and stiffness of the cushion.There is certain relationship among hammering energy,thickness and stiffness of the cushion.A certain stiffness corresponds to an optimal thickness,the optimal thickness and the range of optimal thickness is enlarged with the increase of stiffness.Much better effectiveness of driving pile with thicker and suitable pile cap cushion can be obtained.

关 键 词：锤击桩 桩帽垫层 厚度 刚度 贯入度 桩身应力 锤击能 

分 类 号：TU473.1[建筑科学—结构工程]