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利用响应面方法开展横向荷载下斜坡桩的可靠性研究。引入一种考虑斜坡效应的新型载荷-位移(p-y)曲线方法模拟斜坡上横向受荷桩桩-土作用系统,采用斜坡桩桩顶位移和桩身弯矩作为功能准则,建立桩顶位移失效和桩身最大弯矩两种失效模式下横向荷载作用斜坡桩基的可靠性分析方法,利用蒙特卡罗法验证了斜坡地面上横向受荷桩的可靠性分析方法。讨论横向荷载作用下斜坡桩基可靠性的影响因素。结果表明,桩顶位移的变异性随着极限承载因数(N_(pu))、50%水平的弹性模量(E50)和水平荷载(H)变异系数的增加而增加,N_(pu)和无量纲系数(λ)的负相关关系使桩顶位移概率密度函数(PDF)值的分散性降低;相反,N_(pu)和λ的正相关关系使桩顶位移的PDF值产生较大变化。对于地面水平极限承载因数(Npo)和λ,N_(po)和λ之间的正相关关系和负相关关系均使桩头位移的PDF值产生较大变化,并且N_(po)和λ之间的负相关关系会明显增加这种变异的响应。
Study on the Reliability of Inclined Pile with Lateral Load by Response Surface Method. A new load-displacement (py) curve method considering the slope effect is introduced to simulate the lateral loading pile-soil interaction system on slopes. The top displacement of pile top and the bending moment of pile body are used as functional criteria to establish the displacement failure of pile top and The method of reliability analysis of pile subjected to lateral loading under two failure modes with maximum bending moment of pile body, and the method of reliability analysis of transverse loaded pile on slope surface by Monte Carlo method. The factors that affect the reliability of pile foundation under lateral load are discussed. The results show that the variability of pile top displacement increases with the increase of N (pu), 50% of elastic modulus (E50) and horizontal coefficient of variation (H) The negative correlation of the index (λ) decreases the dispersion of PDF values. On the contrary, the positive correlation between the values of N_ (pu) and λ leads to great changes in the PDF values of pile top displacements. For the positive correlation and negative correlation between horizontal ultimate bearing capacity (Npo), λ, N_ (po) and λ, the PDF values of pile head displacement are greatly changed, and between N_ (po) and λ The negative correlation will significantly increase the response of this mutation.