海洋平台桩基安装过程对土阻力的影响分析

发布时间：2018-05-06 00:02

本文选题：打桩过程 + CPT　；参考：《船舶工程》2016年12期

【摘要】：影响桩基可打入性分析结果的因素有很多,很多学者对此进行了研究,但受到各种因素的限制,对于打桩过程的影响鲜有涉及。文章针对某海域现场两根试验桩的实测数据、室内试验数据和现场CPT(静力触探试验)结果,采用波动方程方法,研究在砂土中打桩时的打桩过程对打桩土阻力(SRD)的影响。分析结果显示,在砂土中,即使桩径达到2.438 m,仍然可以形成闭合的土塞;相同土质条件下,打桩过程中不同的锤击能量导致了不同的锤击数,并进一步产生了SRD的差异,这说明打桩所导致的侧阻退化程度与打桩过程有关。研究结果表明使用波动方程方法评价砂土中打桩的SRD精度要优于传统方法;在本次试验条件下,对于形成土塞的情况,英国帝国理工桩基(ICP)方法的计算结果偏小。
[Abstract]:There are many factors that affect the results of pile foundation drillability analysis, many scholars have studied this, but limited by various factors, the influence of piling process is rarely involved. Based on the measured data of two test piles in a certain sea area, indoor test data and CPT (static penetration test) results, the influence of piling process on the piling resistance (SRD) in sand is studied by using wave equation method. The results show that in sand, even if the diameter of pile is 2.438 m, the closed plug can be formed, and under the same soil condition, different hammer energy leads to different hammering number, and the difference of SRD is further produced. This indicates that the side resistance degradation caused by piling is related to the piling process. The results show that the SRD accuracy of using the wave equation method to evaluate pile driving in sand is better than that of the traditional method, and the calculation result of the method is small for the formation of soil plug under this experimental condition.
【作者单位】：天津大学建筑工程学院;中海油上海分公司;
【基金】：国家973项目(2014CB046800) 国家重大专项(2011ZX05056-002-01) 自然科学重点基金(51239008)
【分类号】：TU473.1

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