应用于海洋工程中水平受荷桩特性分析的修正P-y曲线模型

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武亚军,卢晨阳,李卫超,杨敏.应用于海洋工程中水平受荷桩特性分析的修正P-y曲线模型[J].,2018,58(5):511-518

应用于海洋工程中水平受荷桩特性分析的修正P-y曲线模型

ModifiedP-y curve model for analysis of laterally loaded piles in marine engineering

DOI：10.7511/dllgxb201805011

中文关键词:P-y模型水平受荷桩静力荷载循环荷载折减系数

英文关键词: P-ymodel laterally loaded pile static load cyclic loading reduction coefficients

基金项目:国家自然科学基金资助项目(41772303)；上海市自然科学基金资助项目(17ZR1410100).

作者	单位
武亚军,卢晨阳,李卫超,杨敏

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中文摘要:

水平受荷桩特性常采用API规范中的P-y曲线法进行分析，但是对于长期受循环荷载的海洋工程中的水平受荷桩来说静力计算结果往往偏小．为此，首先在API规范的基础上对其中的3个关键参数静止土压力系数K0、投影角α和初始地基刚度K进行了重新定义和取值，并采用两个试验桩进行了验证，结果证明修正后的P-y曲线模型相对API规范模型和双曲线模型能更有效地预测单桩位移反应性状．同时，在静力分析基础上，针对Rosquot折减方法的不足，对其中影响系数a的取值进行了改进，将改进后的折减方法与修正后的P-y曲线模型相结合仍然对前述两个循环荷载作用下桩的水平受荷特性进行了分析，结果表明修正方法得到的计算结果和实测值吻合得很好．

英文摘要:

Lateral response of pile is widely analyzed with P-ycurve method recommended by API standard, but the static response is generally underestimated with this method for the laterally loaded piles under long term cyclic loading in offshore engineering. Therefore based on the API standard, three key parameters, earth pressure coefficients at rest K0, project angle α and initial foundation stiffness K, are redefined and valued, which is verified against the measured response of two test piles. This verification proves the ability of modified P-y curve model to produce a better prediction of the monopile displacement response than that given by the API standard recommended model and another hyperbolic model. Furthermore, based on the static analysis, the Rosquot reduction method is modified by changing the influencing coefficient a. The modified reduction method incorporated with the proposed modified P-ycurve model is employed to predict the two test piles subject to lateral cyclic loading. The calculated responses are in good agreement with the measured values.

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应用于海洋工程中水平受荷桩特性分析的修正P-y曲线模型

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