| PBA工法中边桩参数对结构稳定性的影响研究 |
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| 作者单位： | ;1.北京建筑大学土木与交通工程学院 |
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| 摘 要： | 以北京地铁6号线北海北站工程为背景,采用FLAC3D数值模拟的方法,研究不同的边桩嵌入深度和边桩直径下地层沉降、边桩水平位移和洞底塑性区的规律。研究分析表明:地表沉降和边桩水平位移随着边桩嵌入深度的增加而减少;当嵌入深度一定时,不同边桩直径下对边桩水平位移的影响大于对地表沉降的影响;嵌入深度与洞底塑性区特性具有明显关系,嵌入深度小会使洞底、洞顶土体产生较大塑性区。
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| 关 键 词： | 地铁车站 PBA工法 数值模拟 地表沉降 边桩水平位移 塑性区 |
Influence of Side-pile Parameters of PBA Construction Method on Structural Stability |
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| Institution: | ,School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture |
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| Abstract: | With reference to BEIHAI North Station project of Beijing metro line 6,the settlement of stratum,horizontal displacement of side-pile and plastic zone of the tunnel bottom are analyzed at different embedded depths and diameters of side-piles with the numerical method of FLAC3 D. The results show that the settlement of surface and horizontal displacement of side-pile decrease with the increase of the embedded depth of the side-pile; when the embedded depth of side-plies is fixed,the influence on the side-pile horizontal displacement generated by varying diameter of side-pile is greater than the influence on surface settlement; the close relation between the embedded depth and the bottom plastic zone suggests that shallow embedded depth generates bigger plastic zone in the tunnel top soil mass. |
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| Keywords: | Metro station PBA method Numerical simulation Surface subsidence Side-pile horizontal displacement Plastic zone |
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