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STUDY ON THE BEHAVIOR OF CANTILEVER DOUBLE-ROW PILES SUPPORTING DEEP EXCAVATION
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摘要: 采用大型有限元通用软件ABAQUS对双排桩支护的深基坑开挖进行模拟。研究地基土模量随深度增加的情况下,不同排距时的桩身侧移和土压力的分布,分析排距、桩长、系梁高度、桩间土以及被动区土体模量对桩顶侧移的影响。在各因素中,被动区土体性质的影响最为显著,而桩长、系梁高度的影响较弱。同时通过梁单元嵌固的方法考察桩身弯矩分布,并与平面单元模拟的结果进行对比,分析考虑和不考虑接触对桩顶侧移的影响。Abstract: Excavation braced by cantilever double-row piles is simulated by ABAQUS.Duncan-Chang constitutive model is used for the soil and the tangential module is settled to increase with the depth.Horizontal displacement of the pile and the earth pressure are studied.The influences of pile spacing,pile length,beam height,the reinforcement of the passive area and the soils between the piles on the piles behavior are analyzed.The results show that reinforcing the passive area has an obvious effect on decreasing displacement,while the pile length and beam height have little effect.Results are also compared when the piles are simulated by plane strain element and beam element in order to study the effect of the surface contact calculation.
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