斜坡基桩p-y曲线及水平承载计算方法研究

doi:10.13722/j.cnki.jrme.2017.1025

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摘要斜坡基桩p-y曲线及其计算方法值得深入研究。在Matlock黏土p-y曲线及双曲线型砂土p-y曲线基础上，建立黏、砂性土坡p-y曲线，相应地推导基桩挠曲微分方程及桩身内力与位移分析的有限差分法解，并将其与Matlock试验及室内模型试验进行对比验证。对比分析表明：由理论方法计算得到的桩身水平位移及弯矩值与实测结果均吻合较好，最大计算误差均控制在20%以内。且桩顶水平荷载和斜坡坡度越大，计算误差越大。桩身最大弯矩约出现在地面以下3～6倍桩径范围内，桩身最大弯矩及第一弯矩零点埋深均随坡度或桩顶水平荷载增加而增大。为提高斜坡基桩桩身抗弯承载力，地面以下6倍桩径范围内应增加桩身配筋，且应通长配筋。

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关键词 ：桩基础, 水平荷载, 斜坡, p-y曲线, 有限差分法

Abstract：The p-y curve and calculation methods of piles in sloping ground need further study. The p-y curves for cohesive and sand slopes were established by improving the p-y curve proposed by Matlock for clay and the hyperbolic p-y curve for sand，and the deflection differential equation of piles in sloping ground were deduced accordingly. A finite difference method for analysing the internal force and displacement of pile shaft was proposed. The methods were verified through Matlock tests and indoor model tests. The calculated results of the horizontal displacement and bending moment of piles with the proposed method are in good agreement with the experimental results. The maximum calculation error is less than 20%，and the error increases with the horizontal loads and slope angles. The maximum bending moment of piles occurs within the depth of 3 to 6 times the pile diameter below the ground surface. The locations of the maximum and zero bending moment increase with the slope angles and horizontal loads. In order to improve the bending capacity of piles in sloping ground，reinforcement should be increased in the range of 6 times the pile diameter below the ground surface，and the full length reinforcement along pile shaft is recommended.

Key words： pile foundation horizontal load slope p-y curve finite difference method

引用本文:

尹平保1，2，聂道流1，杨朝晖1，2，贺炜1，贾文文1. 斜坡基桩p-y曲线及水平承载计算方法研究[J]. 岩石力学与工程学报, 2018, 37(4): 996-1003.
YIN Pingbao1，2，NIE Daoliu1，YANG Zhaohui1，2，HE Wei1，JIA Wenwen1. The p-y curve and computation method of the horizontal bearing capacity of piles in sloping ground. , 2018, 37(4): 996-1003.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2017.1025 或 http://www.rockmech.org/CN/Y2018/V37/I4/996

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