华东交通大学学报2024，Vol.41Issue(3)：1-9,9.
桩板结构路基沉降安全判据研究
Safety Criteria for Settlement of Pile Plate Structure Subgrade
摘要
Abstract
[Objective]To establish the relationship between the deterministic safety design and reliability design of pile plate structure subgrade.[Method]This paper first derives the analytical solution for settlement calcula-tion of pile plate structure subgrade and establishes the reliability analysis model for the subgrade.The influence of the variability coefficient of subgrade soil elastic modulus,upper load,and pile spacing on the failure probabil-ity of subgrade settlement is studied.Subsequently,a framework for settlement safety criteria of pile plate struc-ture subgrade based on the generalized reliability ration of safety margin is proposed.The relationship between the relative safety margin of the generalized reliability index and the safety factor's relative safety margin is ana-lyzed,and the effect of overlying load on the critical pile spacing is discussed.[Result]The results show that the settlement calculation method in this paper can better reflect the settlement deformation characteristics of the pile plate structure subgrade.The settlement of the pile plate structure subgrade is jointly determined by the up-per load and the combined stiffness of the plate,and its failure probability curve with the load level changes from a steep increase to linear growth as the variability coefficient of the subgrade soil elastic modulus increases.The rela-tive safety margin of the generalized reliability index and the safety factor's relative safety margin exhibit an approxi-mately linear relationship.In addition,an increase in overlying load will lead to a logarithmic non-linear decrease in the critical pile spacing.[Conclusion]By allowing the failure probability to calibrate the allowable safety factor,the basic consistency of deterministic design and reliability design of the pile plate structure subgrade is ensured.关键词
道路工程/桩板结构/路基沉降/解析解/可靠度/相对安全率Key words
roadway engineering/pile plate structure/subgrade settlement/analytical calculation/reliability/ra-tio of safety margin分类
土木建筑引用本文复制引用
李宝地,李锦良,冯超..桩板结构路基沉降安全判据研究[J].华东交通大学学报,2024,41(3):1-9,9.基金项目
陕西省交通运输厅交通科研项目(22-46K) （22-46K）
