摘要
针对公路路线设计参数的不确定性,以概率论为基础,建立公路路线设计指标,包括停车视距、平曲线半径以及竖曲线半径可靠度模型,通过可靠度指标和失效概率,分析路线设计指标的可靠性。研究结果表明:为确保停车视距设计指标可靠性,公路某一点停车视距的下降应控制在15%范围内,横向摩擦因数的降低将大大影响平曲线半径设计的可靠性;竖曲线半径下降超过某一值时其可靠性将大幅度降低。该研究为道路设计人员在线形设计指标的安全性和经济性之间的合理选择提供理论依据,也为公路设计人员提供了新的设计思路。
Considering the uncertainty of highway geometry design parameters,the reliability models involved in stop sight distance（SSD）,horizontal curve radius（HCR） and vertical curve radius（VCR） are developed based on probability theory.Reliability indexes and failure probability are obtained by reliability calculation method and are used to analyze reliability of highway alignment design indicators.The study results show that the reduction of stop sight distance（SSD） should be limited in the range of 15 percent at any point in highway to guarantee the reliability of SSD.The declination of lateral friction factors significantly affects the reliability of HCR.If the reduction of VCR exceeds a certain value,the VCR reliability will sharply decline.Reliability theory in highway alignment design provide theoretical basis for the designers who are confused about the best choice between safety and cost for any factor.Meanwhile,it offers the designers a new design idea.2 tabs,8 figs,9 refs.
出处
《长安大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2010年第4期46-50,共5页
Journal of Chang’an University(Natural Science Edition)
关键词
道路工程
可靠度模型
概率理论
公路路线设计
安全边际
road engineering
reliability model
probability theory
highway alignment design
safe margin
