论文部分内容阅读
针对桩承式路堤结构的作用特点,基于Marston土压力理论,通过考虑填料粘聚力的柱面剪应力转移模型,对桩承灰土路堤基底荷载效应进行了研究;并结合Winkler地基模型提出了基底变形协调的荷载作用效应值迭代求解的方法。通过算例,对计算模型中剪应力修正系数β、填料粘聚力c、基底桩土刚度等因素进行了分析。结果表明:随着β、c的增大,桩间应力折减比S降低,桩顶应力集中明显,工程计算中不应忽略两者的影响;桩帽尺寸效应(b/s,mc)对基底桩、土刚度影响显著,计算中需对基底桩、土刚度系数进行修正;桩间应力折减比S随b/s呈先减小后增大的趋势,且当桩帽置换率mc约为25%~35%时,路堤土拱效应更为显著。
According to the function of piled embankment, based on the Marston earth pressure theory, the loading effect of the embankment on limestone embankment was studied by considering the cohesion of the column. Based on Winkler foundation model, Iterative Solution of Deformation Coordinated Load Effect Effect. Through the example, the factors such as shear stress correction factor β, filler cohesion c and pile-soil stiffness of foundation are analyzed. The results show that with the increase of β and c, the stress reduction ratio between piles is lower than that of S, and the stress concentration on pile top is obvious. The influence of both should not be neglected in engineering calculation. The effect of pile cap size (b / s, mc) The effect of foundation pile and soil stiffness is significant. The calculation of the foundation pile and soil stiffness coefficient should be corrected. The stress reduction ratio S between piles decreases first and then increases with b / s. When the replacement rate of pile cap mc is about For 25% ~ 35%, embankment soil arching effect is more significant.