不同土质下预制方桩沉桩承载力特性分析  

Bearing capacity performance during sinking and driving monitoring of precast piles

作　　者：臧德记[1,2] 汪滨[1,2] 蒋华忠[3] 

机构地区：[1]南京水利科学研究院,江苏南京210024 [2]水文水资源与水利工程国家重点实验室,江苏南京210024 [3]中交水运规划设计院有限公司,北京100007

出　　处：《水运工程》2015年第12期157-160,共4页Port & Waterway Engineering

基　　金：中央级公益性科研院所基本科研业务费专项资金项目(Y414002)

摘　　要：对沿海地区某码头预制方桩沉桩过程进行监控。结果表明,打桩时由于桩周土扰动剧烈,桩的贯入阻力大幅减小,粉质土贯入阻力降低比例高于粉砂。复打测试表明:粉质土的恢复系数较粉砂高;桩侧摩阻力与土层性质密切相关。在沉桩时可根据土层情况选用合适的打桩锤击力,以减小或避免对桩的不利影响。The driving process of prefabricated piles of a wharf in coastal areas is monitored. The result shows that due to the soil＇s severe disturbance around the pile, the penetration resistance of pile is greatly reduced, and that of silty soil is higher than that of silty sand. The redriving test shows that the coefficient of restitution of silty soil is larger than that of silt, and kin friction along the pile is closely related to the pile side soil properties. Appropriate piling hammer shall be chosen according to the soil condition during pile-driving to reduce or avoid the adverse effects on the pile.

关 键 词：预制桩 沉桩 承载力 高应变 

分 类 号：U655.55[交通运输工程—港口、海岸及近海工程]