Influence Law and Safety Measures of Foundation Pit Excavation on Existing Railway Subgrade in Tidal Flat Areas

被引：0
|
作者：
Lei H. [1 ,2 ]
Feng S. [1 ]
Wan Y. [3 ]
Jia R. [1 ,2 ]
Han J. [4 ]
Jin H. [4 ]
机构：
[1] School of Civil Engineering, Tianjin University, Tianjin
[2] Key Laboratory of Coast Civil Structure Safety of Ministry of Education (Tianjin University), Tianjin
[3] Institute of Frontier Technology, Tianjin University, Tianjin
[4] China Railway 16th Bureau Group the 5th Engineering Co., Ltd., Tangshan
来源：
Tianjin Daxue Xuebao (Ziran Kexue yu Gongcheng Jishu Ban)/Journal of Tianjin University Science and Technology | 2019年 / 52卷 / 09期
基金：
中国国家自然科学基金;
关键词：
Foundation pit excavation; Influence law; Safety measures; Subgrade; Tidal flat area;
D O I：
10.11784/tdxbz201809001
中图分类号：
学科分类号：
摘要：
Excessive settlement difference of railway subgrade in tidal flat areas is caused by foundation pit excavation. The settlement difference greatly affects normal use and safe operation of the railway;therefore, it is important to control the deformation of railway subgrade. Based on engineering and geological conditions and construction requirements of foundation pit excavation adjacent to existing railway subgrade in tidal flat areas, the finite element method was utilized in this study to systematically investigate influence law and safety measures of foundation pit excavation on existing railway subgrade in tidal flat areas. In terms of influence law, the settlement difference, the lateral displacement at the foot of slope, and the horizontal displacement of the retaining structure were analyzed for different foundation pit excavation depths and different distances from the existing railway subgrade to the foundation pit. Combined with the engineering requirement, three safety optimization measures were provided for the railway subgrade under the most dangerous construction condition, including the enlarging stiffness of the retaining structure, the setting of partition wall and the increase of the number of supports. And the optimal construction measure was determined. Research showed that deeper the foundation pit excavation and closer the distance between foundation pit and subgrade, higher the safety risk of railway subgrade. Based on this, the safety control distance of railway subgrade construction near beach was recommended to be more than 5.0m. Additionally, optimization measures were compared and analyzed for the railway subgrade construction under the most dangerous construction condition. Only increasing the stiffness of the enclosure structure could not ensure safe construction. Laying partition wall reduced the earth pressure on the retaining structure, which had better reinforcement effect. Increasing the number of supports minimized horizontal displacement of retaining wall, which has the best reinforcement effect. © 2019, Editorial Board of Journal of Tianjin University(Science and Technology). All right reserved.
引用
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页码：969 / 978
页数：9
相关论文
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