斜向水泥土桩法加固既有铁路路基施工研究

Research on the Construction of Reinforced Existing Railway Subgrade by Diagonal Cement Soil Pile Method

摘要

既有铁路路基在长期列车动荷载、季节性含水变化与局部病害叠加作用下，常出现沉降发展不均、边坡软弱带剪切变形与基床刚度衰减等问题。工程上若受限于封锁时间与既有线安全控制，常规开挖换填或大范围加宽处理难以实施。斜向水泥土桩法利用边坡可作业面，将水泥土固结体以一定倾角插入路基体内，形成可与路基应力扩散路径匹配的“斜向加固骨架”，在不拆轨或少扰动条件下改善路基整体变形特性。本文结合中国既有线加固的常见工况与文献报道，梳理斜向水泥土桩法的机理要点与参数认识，并提出可落地的施工控制做法。该方法的关键在于成桩几何控制、浆液与土体耦合质量以及施工扰动约束。

Abstract

Existing railway subgrades often exhibit uneven settlement development, shear deformation in weak zones of slopes, and reduced bed stiffness under the combined effects of long-term train dynamic loads, seasonal moisture variations, and localized damages. In engineering practice, conventional excavation and replacement or large-scale widening treatments are difficult to implement due to time constraints and safety control requirements for existing lines. The oblique cement-soil pile method utilizes the operable surface of slopes to insert cement-soil consolidated masses at a certain inclination angle into the subgrade, forming an “oblique reinforcement skeleton” that matches the stress diffusion path of the subgrade, thereby improving the overall deformation characteristics of the subgrade without track removal or minimal disturbance. This paper combines common working conditions for China’s existing line reinforcement and literature reports to summarize the key principles and parameter understanding of the oblique cement-soil pile method, and proposes practical construction control measures. The key aspects of this method lie in pile geometry control, the coupling quality of slurry and soil, and construction disturbance constraints.

关键词

斜向水泥土桩法 / 加固 / 既有铁路 / 路基施工 / 价值 / 要点 / 研究

Key words

Oblique cement-soil pile method / Reinforcement / Existing railway / Subgrade construction / Value / Key points / Research

参考文献

[1] 郭发蔚. 斜向水泥土桩法加固既有铁路路基施工技术研究[J]. 2024(31):123-125.

[2] 吕平. 斜向水泥土桩法加固既有铁路路基施工技术探索[J]. 河南建材, 2018(3):2.

[3] 陈洪利. 斜向水泥土桩法加固既有铁路路基施工技术研究[J]. 建筑工程技术与设计, 2018, 000(013):646.

[4] 陈俊宏. 既有铁路工程中线路加固及地基处理技术分析[J]. 中国房地产业, 2023(6).

[5] 杭红星, 陈尚勇, 吴成杰. 新线引入既有客运专线车站软土地基加固技术[J]. 铁道建筑, 2024, 64(1):105-110.