摘要
如何实现沿海高水位地区铁路路基结构的稳定性、经济性和耐久性是目前设计的难点。以尼日利亚拉伊支线铁路项目为依托,分析浸水路基结构在应用中存在的挑战,创新地提出了钢筋混凝土U型槽全断面防水路基结构(已获专利授权);阐述了该全断面防水路基的结构形式、设计要点、主要设计参数和指标、结构优点。结果表明:(1)钢筋混凝土U型槽路基结构解决了沿海地区地下水位高且变化频繁、淤泥质土或深厚垃圾土地段承载力不足的路基结构设计难题,实现了路基结构的稳定性;(2)U型槽路基结构有效减少了征地范围,加快了施工进度,实现了路基结构的经济性;(3)U型槽全断面防水路基结构充分利用了钢筋混凝土+级配碎石+沥青混凝土材料特性,刚柔结合,形成了封闭的防水路基组合结构,达到了防水效果,实现了路基结构的耐久性。
XIA Lijun;China Civil Engineering Construction Corporation;The stability,economy,and durability of railway subgrade structures in high-water areas along the coast are currently difficult to design.Based on the Nigerian Lagos-Ibadan Branch Line Railway project,this paper analyzes the challenges of immersed subgrade structures in practical applications and innovatively proposes a reinforced concrete U-shaped groove full-section waterproof subgrade structure which has been granted a patent.The structure form,design points,main design parameters and indicators,and structural advantages of the full-section waterproof subgrade are described.The results show that:(1)the reinforced concrete U-shaped groove subgrade structure solves the design problem of subgrade structure instability caused by high and frequently changing groundwater levels,silt or deep garbage soil with insufficient bearing capacity in coastal areas,achieving subgrade structure stability;(2)the U-shaped groove subgrade structure effectively reduces the land acquisition range,accelerates the construction progress,and realizes the economic value;(3)the U-shaped groove full-section waterproof subgrade structure fully utilizes the characteristics of reinforced concrete,graded crushed stone,and asphalt concrete materials,and the combination of rigidity and flexibility to form a closed waterproof subgrade structure,achieving waterproof effect and subgrade structure durability.
作者
夏利军
XIA Lijun(China Civil Engineering Construction Corporation,Beijing 100038,China)
出处
《铁道建筑技术》
2023年第7期92-94,140,共4页
Railway Construction Technology
基金
中国土木工程集团有限公司科技研究开发计划项目(ZT-2018B02)。
关键词
高水位铁路
全断面防水
路基
结构设计
high water level railway
full-section waterproof
subgrade
structural design
