考虑参数空间变异性的高桩码头-岸坡体系可靠性分析

Reliability analysis of high-pile wharf and shore slope system considering parametric space variability

为进一步发展高桩码头-岸坡体系结构可靠性分析方法,基于KL-Copula互相关随机场模拟方法,综合考虑了岸坡土体参数空间变异性与其相关结构及大小的影响,提出一种岸坡-高桩码头体系互相关随机场模拟与可靠性求解数值实施流程,并基于PLAXIS计算程序平台,编写了高桩码头-岸坡体系互相关随机场模拟与可靠性分析外挂求解程序KLCPRP。在此基础上,进一步结合非侵入式随机分析方法进行相关算例分析,探讨不同岸坡强度参数Copula函数结构对互相关随机场模拟和高桩码头结构可靠性求解的影响规律。计算分析结果表明:不同Copula函数结构所对应模拟样本的线性相关系数、秩相关系数均存在一定差异性;对于有限实验数据情况,Gaussian Copula函数结构会导致随机场计算结果偏于保守;所提出的KL-Copula模拟随机场数值实施流程及对应外挂求解程序KLCPRP具有良好的精度和有效性,可为高桩码头-岸坡相互作用体系的相关工程设计及安全评价提供理论参考。

To further develop structural reliability analysis methods for high-pile wharf and shore slope systems,this paper,based on the KL-Copula cross-correlated random field simulation method,comprehensively considers the influence of spatial variability of slope soil parameters,its related structures,and dimensions.It proposes a numerical implementation procedure for shore slope-high-pile wharf systems cross-correlated random field simulation and reliability solution,formulating the high-pile wharf-shore slope system cross-correlation random field simulation and reliability analysis plug-in solver KLCPRP based on the PLAXIS computing program platform.Building on this,nonintrusive stochastic analysis methods are further employed for related example analysis to explore the impact of different slope strength parameter Copula function structures on cross-correlated random field simulation and high-pile wharf structural reliability solutions.Computational analysis indicates:there exist certain differences in the linear correlation coefficients and rank correlation coefficients of simulation samples corresponded to different Copula function structures;for limited experimental data scenarios,the Gaussian Copula function structure tends to yield conservative random field computation results.The KL-Copula cross-correlated random field numerical implementation procedure and the corresponding plug-in solver KLCPRP presented in this paper possess favorable accuracy and effectiveness,offering a theoretical reference for the related engineering design and safety evaluation of high-pile wharf and shore slope interaction systems.