被动桩中土拱形成机理的平面有限元分析

国内外对被动桩中土拱形成机理的研究比较少,尤其针对不同土性土体中这类问题的对比研究更是少见。借助平面有限元数值方法,对粘性土与无粘性土中被动桩间的土拱形成机理作了研究和对比分析,并讨论了土拱形成过程与土拱效应随土体参数如粘聚力、内摩擦角、弹性模量、剪胀角、泊松比、桩土接触特征的变化规律。研究表明:土性不同时,土拱形成过程中桩周土体的受力和破坏形式不同;剪胀角、泊松比、桩土接触特征对桩间土拱形成机理和效应影响明显。

Plane FEA of soil arching effects mechanism in passive piles

Few researches have been carried out about soil arching effect mechanism and behaviors behind passive piles, especially the comparison when soil parameters changed. Plane FEA was applied to study problems above, and researches about relationship between soil arching effect mechanism and soil parameters were done. Parameters include cohesion, internal friction angle, elastic modulus, Poisson ratio, dilatancy angle, and interface conditions. It was found that the yield mechanism of cohesive soil and cohesionless soil around piles are different when forming the soil arching; and poisson ratio, dilatancy angle, and interface conditions play very important roles in soil arching effect mechanism.