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 FLAC3D . 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.%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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