深厚软土区堆载作用下桥梁桩基的变形与受力分析  

Deformation and Stress Analysis of Bridge Pile Foundation under Unilateral Surcharge Load in Deep Soft Soil Area

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作  者:叶胜 刘越 王虎 YE Sheng;LIU Yue;WANG Hu(China Railway NO.5 Engineering Group Co.,Ltd.,Changsha 410007,China;Zhuhai Institute of Urban Planning&Design,Zhuhai 519000,China)

机构地区:[1]中铁五局集团有限公司,长沙410007 [2]珠海市规划设计研究院,广东珠海519000

出  处:《广东土木与建筑》2025年第4期32-34,44,共4页Guangdong Architecture Civil Engineering

基  金:广东省住房和城乡建设厅科技创新计划项目(2022-K4-231814)。

摘  要:为分析深厚软土区单侧堆载对桥梁桩基的影响,依托实际项目建立考虑软土固结效应的土体-桩基-堆载协同计算分析模型,探讨单侧分层、长期堆载作用下桥梁桩基的位移和内力变化规律。结果表明:①单侧大面积堆载作用下,上部软土层内侧向影响范围达到了10 m以上;桥墩与桩基发生的远离堆载的水平向位移主要发生在上部软土层,随着分层堆载的加大,其最大值从27.2 mm,70.1 mm,111.1 mm,至固结100 d后发展到113.6 mm。②对桩基受力的影响主要发生在软硬土层的交界处,其中最大轴力由初始状态的6670 kN增大至8200 kN,增加了约23%;靠近堆载的桩体弯矩大于后桩,弯矩最大值由初始状态的950 kN·m增大至5300 kN·m,弯矩值增加了约3倍,桩体内力均小于极限承载力。To analyze the impact of unilateral surcharge load on bridge pile in deep soft soil areas,a soil pile foundation pile loading collaborative calculation and analysis model considering the consolidation effect of soft soil is established based on actual projects,and the displacement and internal force changes of bridge pile foundations under unilateral layering and long-term pile loading are explored.The results show that:①Under the unilateral surcharge load,the horizontal sphere of influence of the upper soft soil layer reaches more than 10 m;The horizontal displacement of bridge piers and pile foundations away from the surcharge load mainly occurs in the upper soft soil layer,with the increase of layered stacking,the maximum value range from 27.2 mm,70.1 mm,111.1 mm,and develop to 113.6 mm after 100 days of consolidation.②The change of pile foundation force occurs mainly at the junction of soft and hard soil layers,in which the maximum axial force increases from 6670 kN in the initial state to 8200 kN,an increase of about 23%;the bending moment of the pile body close to the surcharge load is larger than that of the back pile,and the maximum value of the bending moment increases from 950 kN·m in the initial state to 5300 kN·m,an increase of about three times.The pile body internal force is less than the ultimate load carrying capacity.

关 键 词:深厚软土 堆载 桩基 影响分析 

分 类 号:TU473[建筑科学—结构工程]

 

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