地铁车站深基坑支撑下方中立柱设置优化研究
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摘要
在地铁车站深基坑支撑下方设置中立柱,一方面提高了支撑稳定性;但另一方面,基坑开挖会带动中立柱隆起,进而造成支撑承载力下降。结合合肥市轨道交通5号线云谷路站深基坑立柱隆起的实测数据,计算分析立柱隆起对支撑体系的影响。通过设置中立柱与取消中立柱两种情况的对比分析,提出可通过加大支撑截面尺寸等措施取消中立柱。建议地铁车站深基坑围护结构支撑采用取消中立柱的优化设计。
The setting up of neutral pillars beneath the supporting structure of station deep foundation pit improves the stability of the support on the one hand, and on the other hand, it drives the uplift of neutral pillars and decreases the bearing capacity of the support. In this paper, the influence of pillar uplift on supporting system is calculated and analyzed based on the measured data of a deep foundation pit at Yungu Road Station on Hefei rail transit Line 5. Through comparative analysis of the setting up and removing of neutral pillars, it is proposed to increase the cross-section size of the support so as to achieve the optimal design by removing the neutral pillars.
The setting up of neutral pillars beneath the supporting structure of station deep foundation pit improves the stability of the support on the one hand, and on the other hand, it drives the uplift of neutral pillars and decreases the bearing capacity of the support. In this paper, the influence of pillar uplift on supporting system is calculated and analyzed based on the measured data of a deep foundation pit at Yungu Road Station on Hefei rail transit Line 5. Through comparative analysis of the setting up and removing of neutral pillars, it is proposed to increase the cross-section size of the support so as to achieve the optimal design by removing the neutral pillars.
引文
[1] 冯虎,刘永辉,徐春蕾.立柱隆起对地铁深基坑钢支撑体系稳定的影响[J].中国科技论文,2014(11):1301.
[2] 江娟,刁鹏.软土区深基坑施工立柱桩的研究[J].施工技术,2007(1):27.
[3] 操小兵,金文,李镜培,等.基坑开挖卸荷引起立柱桩的隆起位移计算[J].结构工程师,2018(1):131.
[2] 江娟,刁鹏.软土区深基坑施工立柱桩的研究[J].施工技术,2007(1):27.
[3] 操小兵,金文,李镜培,等.基坑开挖卸荷引起立柱桩的隆起位移计算[J].结构工程师,2018(1):131.