富水砂卵石地层大型地铁车站基坑变形与支护结构受力分析
刘季富
Foundation Pit Deformation and Supporting Structure Stress Analysis of Large Metro Station in Water-rich Sandy Cobble Stratum
LIU Jifu
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作者信息:中铁十四局集团隧道工程有限公司， 250002， 济南
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Affiliation:China Railway 14th Bureau Group Tunnel Engineering Co., Ltd., 250002, Jinan, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2022.06.009
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中图分类号/CLCN:TU441+.6∶U231.4
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栏目/Col:研究报告
摘要:
依托成都5号线青羊宫站富水砂卵石地层深基坑工程，对车站基坑的开挖变形与支护结构受力进行了分析。结果表明，采用截水帷幕可有效阻断基坑内外的水层交流，改变基坑内外水流路径，降低截水帷幕幕墙以外总水头影响，有效保障基坑周围建筑物的稳定性；在距基坑边界04～24倍基坑宽度区域内，有无截水帷幕在横、纵断面上对基坑降水的敏感度存在显著差异，随着砂卵石地层厚度增大，其差异越明显；砂卵石地层卸荷时，土层原来的平衡状态受到破坏，引起砂卵石块滚动，产生砂卵石块静、动荷载叠加，加剧挤压围护结构侧向变形，钢支撑所受轴力显著增大。
Abstracts:
Based on the deep foundation pit project in water-rich sandy cobble stratum of Qingyanggong Station of Chengdu Metro Line 5, the excavation deformation of station foundation pit and the stress of supporting structure are analyzed. Results show that the water cutoff curtain can effectively block the exchange of water layers inside and outside the foundation pit, changing the water flow path inside and outside the foundation pit, reducing the influence of the total head outside the water cut-off curtain wall, and effectively ensuring the stability of the buildings around the foundation pit. In the area D (0.4~2.4 times of foundation pit width) away from the boundary of the foundation pit, there is a significant difference in the sensitivity of the water cut-off curtain to the foundation pit precipitation on the transverse and longitudinal sections. The difference becomes more obvious with the increase of the thickness of sandy cobble stratum. When the sandy cobble stratum removes load, the balanced status of soil layer is disturbed, causing cobbles rolling, adding up the static and dynamic load of sandy cobbles, forcing lateral deformation of enclosure structure, and increasing axial forces on steel support evidently.
时评 / Commentary
刘季富. 富水砂卵石地层大型地铁车站基坑变形与支护结构受力分析. 城市轨道交通研究, 2022, 25(6): 43.
LIU Jifu. Foundation pit deformation and supporting structure stress analysis of large metro station in water-rich sandy cobble stratum. Urban Mass Transit, 2022, 25(6): 43.
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