浅埋大直径钢管幕施工方案及其影响分析
袁齐虎1王叶斌1张兴其2杨新安3李路恒3李赵翰青3
Construction Scheme and Influence Analysis of Shallow-Buried Large Diameter Steel Pipe Curtain
YUAN Qihu1WANG Yebin1ZHANG Xingqi2YANG Xin’an3LI Luheng3LI Zhaohanqing3
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作者信息:1.中铁四局集团第四工程有限公司，230012，合肥
2.合肥市市政设计研究总院有限公司，230031，合肥
3.同济大学道路与交通工程教育部重点实验室，201804，上海
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Affiliation:1.The Fourth Engineering Co., Ltd.,of CTCE Group, 230012, Hefei, China
2.Hefei Planning Design Institute Co., Ltd., 230031, Hefei, China
3.Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji University, 201804, Shanghai, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.12.028
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中图分类号/CLCN:U231.3
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栏目/Col:研究报告
摘要:
［目的］浅埋管幕施工会对地层产生扰动，引起地面变形，因此，需研究管幕结构顶进顺序对地面沉降的作用规律，以减小管幕群管顶进对软土地层的扰动。［方法］以合肥市庐州大道浅埋隧道段工程为例，对钢管幕顶进施工地面沉降情况进行监测；结合有限差分模型，分析钢管幕顶进顺序对地面沉降的影响。根据监测数据、顶进实际工况和有限差分模型，分析不同钢管幕顶进施工方案对地面变形的差异化影响，优化钢管顶进顺序。［结果及结论］相较于上排钢管，下排钢管的顶进施工对地面沉降的影响更大；整体钢管幕的顶进施工方案宜先顶进上排钢管，然后顶进两侧竖向钢管，最后顶进下排钢管；横向钢管的顶进施工应从中间开始，然后依次交替顶进，两侧竖向钢管从上至下顶进，同一水平高度的钢管同时顶进。
Abstracts:
［Objective］ The construction of shallow-buried pipe curtain structure may disturb the stratum and cause ground deformation. Therefore, it is necessary to study the influence of pipe curtain structure jacking sequence on land subsidence in order to reduce the disturbance of soft soil stratum caused by the jacking of pipe curtain groups. ［Method］ Taking the shallow-buried tunnel section of Luzhou Avenue in Hefei City as an example, the land subsidence caused by steel pipe curtain jacking construction is monitored; combined with the finite difference model, the influence of the steel pipe curtain jacking sequence on land subsidence is analyzed. Based on the monitoring data, the actual jacking conditions and the finite difference model, the differential effects of different steel pipe curtain jacking construction schemes on ground deformation are analyzed, and the steel pipe jacking sequence is optimized. ［Result & Conclusion］ Compared with steel pipes of the upper row, the jacking construction of the lower row steel pipes has a greater impact on land subsidence. Therefore, the jacking construction scheme for the overall steel pipe curtain should first jack the upper row of steel pipes, then the vertical steel pipes on both sides, and finally the lower row of steel pipes; while the jacking construction of the transverse steel pipes should start from the middle, and then jack the steel pipes alternately in sequence; the vertical steel pipes on both sides should be jacked from top to bottom, and the steel pipes at the same level should be jacked simultaneously.
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