基于荷载传递法的桩基沉降计算与承载性能分析  

Settlement Calculation and Load Bearing Performance Analysis of Pile Foundation Based on Load Transfer Method

作　　者：朱永森 吴艳 ZHU Yongsen;WU Yan(Zigong Construction Engineering Co.,Ltd.,Zigong 643000,Sichuan,China;Anyouge Construction Engineering Co.,Ltd.,Zigong 643000,Sichuan,China)

机构地区：[1]自贡建工建设工程有限公司,四川自贡643000 [2]四川安优格建设工程有限公司,四川自贡643000

出　　处：《科技和产业》2024年第17期222-228,共7页Science Technology and Industry

摘　　要：地层由于土体颗粒结构疏松容易产生桩基成桩等质量问题,同时对桩基的承载性能也有较大影响。以自贡市富台家园项目为依托,针对现场两根试验桩开展桩基静载试验,结合理论分析方法,对地层中桩基承载性能进行研究。结果表明:现场两根桩的荷载-沉降曲线为陡降型,桩端与桩侧各自分担了部分荷载属于端承摩擦型桩。桩的极限承载力接近设计值,冗余量小,不利于结构安全,可以考虑固化地层或增加桩长。提出桩侧双折线模型和桩端双参数指数模型组成的桩基荷载-位移传递简化模型,采用MATLAB编程的迭代算法得到荷载-沉降曲线,发现理论计算值与试验实测值结果吻合度较高,表明此荷载-位移模型合理可行,可为类似地层的桩基承载性能研究提供参考。The loose grain structure of the ground is easy to produce pile formation and other quality problems,and also has a great influence on the bearing performance of pile foundation.Based on the project of Futai Home in Zigong City,the static load test of pile foundation was carried out for two test piles on site,and the bearing capacity of pile foundation in strata was studied by theoretical analysis.The results show that the load-settlement curves of the two piles are of steep drop type,and the pile ends and pile sides share part of the load respectively.The ultimate bearing capacity value of pile is close to the design value,and the redundancy is not conducive to the structural safety,so it can be considered to solidify the sand stratum or increase the pile length.A simplified load-displacement transfer model of pile foundation composed of double-fold line model on pile side and double-parameter exponential model on pile end is proposed.The load-settlement curve is obtained by iterative algorithm programmed by MATLAB.It is found that the theoretical calculated value is in good agreement with the experimental value,indicating that this load-displacement model is reasonable and feasible which can provides a reference for the research of bearing capacity of pile foundation in similar sand stratum.

关 键 词：桩基 静载试验 荷载传递法 沉降 承载性能 

分 类 号：TU473.1[建筑科学—结构工程]