摘要
在深入分析可靠度指标的几何意义和响应面法的基本思想的基础上,提出了基于ANSYS和响应面法的可靠度算法与步骤。分析了陕西省吴起县大路沟巨型黄土滑坡的工程地质条件,根据滑坡的工程地质勘察资料和滑坡治理工程的设计资料,建立了基于ANSYS的抗滑桩桩土体系有限元模型,经过自重作用下桩土结构有限元分析,验证了该有限元模型的有效性。在此基础上,选取滑体土重度γ、滑面土内聚力c和内摩擦角、滑面以下土的压缩模量Es4个随机变量,基于响应面(中心复合设计CCD)法和通用有限元软件ANSYS平台,建立了抗滑桩的可靠度分析模型,并研制了对应算法。工程算例结果表明:当试验点数量N=25时,抗滑桩结构的失效概率Pf=0.35%,可靠度指标β=2.70,从而验证了基于ANSYS和CCD响应面法建立抗滑桩可靠度计算模型及算法是可行的。
This paper is based on the in-depth analysis of the geometric meaning of reliability index and the basic idea of response surface method. It proposes the algorithm steps of reliability index on the basis of ANSYS and response surface method. The engineering geological conditions of Dalugou loess landslide in Wuqi County Shaanxi Province are analyzed. According to the landslide geological survey data and design information of landslide remediation engineering,the finite element model of anti-slide pile soil system is established on ANSYS software platform. The numerical simulation results of pile and soil system under own weight condition prove the validity of the finite element model. Moreover,the density γ of landslide,the cohesion c,the internal friction angle φ of slide surface,and the compression modulus Esof sliding bed are screened as random variables. The reliability calculation model of anti-slide pile is developed using ANSYS software and CCD responding surface method. The correspondingalgorithm is developed. The sample calculation shows that,when the number of test point N equals to 25,the probability of failure of anti-slide pile structure Pf= 0. 35% and β = 2. 70,which verifies the feasibility of establishing the reliability model and corresponding algorithm with ANSYS and CCD response surface method.
出处
《工程地质学报》
CSCD
北大核心
2015年第3期454-461,共8页
Journal of Engineering Geology
基金
国家自然科学基金资助项目(41202190)
长安大学中央高校基本科研业务费专项资助项目(2013G3282014)资助
关键词
可靠性
响应面法
抗滑桩结构
黄土滑坡
Reliability,Response surface method,Anti-slide pile,Loess landslide
