铁道科学与工程学报2025，Vol.22Issue(1)：13-24,12.DOI:10.19713/j.cnki.43-1423/u.T20240456
基于桩板结构的既有高铁站场路基上拱成因及变形控制研究
Cause and deformation control of overarching subgrade of existing high-speed railway station based on pile-plate structure
摘要
Abstract
In order to solve the problem that the arch on the high-speed railway subgrade leads to poor track smoothness and uneven force on the subgrade structure,which causes unsafe train operation.Based on the renovation project of arch section of a high speed railway station,the causes of arch disease were analyzed and the improvement methods of adding pile-plate structure reinforcement were put forward.Based on the equivalent theory of subgrade expansion,the soil sample expansion test and numerical simulation were carried out.The expansion relationship of subgrade under humidity field was derived.Combined with the expansion relationship of subgrade,the numerical model of the arch on subgrade was established.The deformation and stress distribution of rail and subgrade structure and the service state of pile-plate structure before and after the improvement of pile-plate structure were compared and analyzed.Finally,the static track inspection was carried out on the track shape before and after the rectification of the site arch section.The results are drawn as follows.It is found that the soil sample of the overarch subgrade contains ettringite,wollastonite and other swelling materials,but the other swelling materials are not exceeded.It is inferred that the overarch subgrade is caused by the reaction between sulfate and cement in the subgrade,resulting in volume expansion.It is inferred that the overarch subgrade is caused by the reaction between sulfate and soil-cement,resulting in volume expansion.Based on the equivalent theory of subgrade expansion,it is found that there is a linear relationship between the logarithm of water content change and the equivalent temperature expansion coefficient of the upper arch subgrade,and a functional relationship is obtained by fitting.The numerical analysis shows that the vertical displacement of the rail in the arch section of the subgrade decreases from 14 mm to 4 mm,the lateral displacement decreases from 4.6 mm to 0.7 mm,and the peak stress decreases by 57.7%before and after the addition of pile-sheet structure.The addition of the pile-plate structure can effectively bear the expansion force of the foundation bed and reduce the displacement of the foundation bed and the peak stress caused by the upper arch.The peak stress of pile-plate structure is within the design range of structural load,and the structure design is safe.After track inspection,the arch data of rail inspection before and after adding pile-plate structure are consistent with the simulation design calculation results,and the rectification effect is remarkable,reaching the requirement of track fine-adjustment to the relevant acceptance specifications.The research results can provide reference for the treatment of subgrade overarching disease and the safe operation of high-speed railway.关键词
高速铁路/路基/上拱/成因/整治/桩板结构Key words
high-speed rail/subgrade/arch up/the cause of formation/renovate/pile-plate structure分类
交通工程引用本文复制引用
王呈金,裴彦飞,苏谦,周辰泠,张宗宇,范荣威..基于桩板结构的既有高铁站场路基上拱成因及变形控制研究[J].铁道科学与工程学报,2025,22(1):13-24,12.基金项目
铁路基础研究联合基金资助项目(U2268213) （U2268213）
国家自然科学基金资助项目(52078434) （52078434）
