泥质粉砂岩物理改良土路基长期动力稳定性分析

陈湘亮^{1, 2}，王永和¹，周天应³，王灿辉²

(1. 中南大学 土木工程学院，湖南 长沙，410075；
2. 湖南城市学院 土木工程学院，湖南 益阳，413000；
3. 长沙理工大学 土木与建筑学院，湖南 长沙，410004)

摘 要：根据相关研究成果以及室内试验及现场测试结果，采用干湿循环击实、共振、临界动应力、动剪应变等参数对武广(武汉-广州)高速铁路中弱-强风化泥质粉砂岩物理改良土进行综合评价。研究结果表明：弱-强风化泥质粉砂岩物理改良土长期动力稳定性满足要求；动剪应变法对路基的长期动力稳定性评价要求更高，是一种较优的评价方法；采用综合方法进行评价分析可以更全面反映路基填料的长期动力稳定性；路基填料是否满足长期动力稳定性要求，可以首先通过室内试验以及理论分析进行初步评价。该研究成果可为我国高速铁路软岩改良土填筑路基的技术标准提供参考，也为高速铁路在建设前对路基的长期动力稳定性分析提供了思路。

关键词：软岩改良土；泥质粉砂岩；路基；长期动力稳定性；动剪应变

Long-term dynamic stability analysis on argillaceous siltstone physical improved soil subgrade of high-speed railway

CHEN Xiang-liang^{1, 2}, WANG Yong-he¹, ZHOU Tian-ying³, WANG Can-hui²

(1. School of Civil Engineering, Central South University, Changsha 410075, China;
2. College of Civil Engineering, Hunan City University, Yiyang 413000, China;
3. School of Civil Engineering and Architecture, Changsha University of Science & Technology, Changsha 410004,China)

Abstract:According to the research results and information of indoor tests and field tests, the weak to highly weathered argillaceous siltstone physically improved soil of Wu-Guang (Wuhan-Guangzhou) High-speed Railway was studied using wetting-drying cycles compaction, resonance, critical dynamic stress, dynamic shear strain parameters, and so on, to comprehensively evaluate the dynamic stability of soft rock improved soil. The results show that the long-term dynamic stability of the weak to highly weathered argillaceous siltstones physically improved soil meets the requirements. Dynamic shear strain method has higher requirements in the long-term dynamic stability evaluation of the subgrade, and is a very evaluable method. An integrated approach to the evaluation and analysis can fully reflect the long-term dynamic stability of the subgrade. The long-term dynamic stability of subgrade filling can be evaluated preliminarily by the results of the indoor test and theoretical analysis. The research results provide a reference to the technical standards of soft rock improved soil for embankment filling of the high-speed railway in China, and supply new ideas on analysis for long-term dynamic stability of high-speed railway subgrade before construction.

Key words:soft rock improved soil; argillaceous siltstone; subgrade; long-term dynamic stability; dynamic shear strain