摘要
关于沉桩结束后打入桩承载力的时效性现象,目前已经开展大量的研究。然而,有关试桩荷载–沉降曲线时效性的模拟方法却鲜见报道。首先,简要分析打入桩时效性的产生机制。然后,基于荷载传递法,提出一种估算沉桩后单桩荷载–沉降性状时效性的新方法。2个量纲一的时间效应系数被加入到传统的荷载传递函数中,以分别描述桩侧摩阻力和桩端阻力随时间的变化。修改后的荷载传递函数可考虑沉桩后任意间歇期的单桩荷载–沉降性状。采用该方法对一个工程实例的打入桩荷载–沉降性状进行验证分析,计算结果与试桩荷载–沉降实测曲线吻合较好。
It is well known that the bearing capacity of a driven pile changes with time after installation. There are many researches focused on the phenomenon of time-dependent bearing capacity related to pile driving. However, very few data have been published on methods of predicting the variation of load-settlement curves with time after driving. A brief review is presented for the current state of knowledge of time effect on driven piles. Based on the load-transfer methods, a new method is proposed to estimate the load-settlement behavior of a single pile after being driven. Two dimensionless time factors are added to the traditional load-transfer functions in order to describe the increase in both shaft friction and base resistance with time respectively. The modified load-transfer functions can consider load-settlement behavior at an actual time after pile installation. For verification, the proposed approach is used to calculate the load-settlement behavior after pile installation in a case study. Good agreement is found between calculated and measured load-settlement curves of static load tests.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2006年第8期1710-1713,共4页
Chinese Journal of Rock Mechanics and Engineering
关键词
桩基工程
打入桩
荷载-沉降性状
时间效应
荷载传递法
pile engineering
driven piles
load-settlement behavior
time effect
load-transfer method
