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根据某一水闸基坑开挖工程,在排桩桩体内埋设测斜仪、钢筋应力计对非等长双排桩基坑支护结构变形特性进行了现场观测,采用规范法讨论了后排桩不同嵌固对前、后排桩的变形、内力影响。研究结果表明:非等长双排桩桩顶位移、桩身剪力、弯矩与传统等长双排桩基坑支护结构规律一致;增大后排桩的嵌固深度,前、后排桩的桩顶位移均减小;前排桩桩身剪力、弯矩减小,后排桩增大,但当嵌固深度超过桩长3/4时,前、后排桩的桩顶水平位移、桩身剪力、弯矩减小或增大趋势均不明显;研究成果为双排桩基坑支护结构设计优化提供一定参考。
According to excavation engineering of one sluice gate, inclinometer and rebar stress meter are buried in the piles of pile body to observe the deformation characteristics of the non-equilateral double-row piles retaining structure, Different embedded on the front and rear piles of deformation, internal forces. The results show that the top displacement, pile shear force and bending moment of double-row piles with unequal length are consistent with those of the traditional double-row piles. The depth of embedded piles increases with the depth of the front and rear rows The pile top displacements decrease; the shear force and bending moment of the front pile reduce, the rear pile increases, but when the embedded depth exceeds 3/4 of the pile length, the pile top level of the front and rear piles Displacement, pile shear force, bending moment decrease or increase trend are not obvious; the research results provide some reference for the design and optimization of double-row piles retaining structure.