含受弯根键的根式沉井承载性能分析  

Analysis of bearing capacity of root-caisson with flexual roots

作　　者：胡丰[1] 龚维明[1] 童小东[1] 殷永高[2] 单建[1] 

机构地区：[1]东南大学土木学院,南京210096 [2]安徽省高速公路总公司,合肥230051

出　　处：《计算力学学报》2010年第3期505-510,共6页Chinese Journal of Computational Mechanics

基　　金：江苏省自然科学基金(BK2008314)资助项目

摘　　要：根据荷载传递法及Winkler地基梁理论,考虑根键弯曲及重叠折减效应,推导了含受弯根键的根式沉井承载性能的弹性解答,计算值在弹性范围内与实测值接近。给出了竖向位移和轴力随深度的分布曲线,并分析了根键的受力性状以及各部分土反力的分担比例等。结果表明,根式沉井的承载性能明显优于传统沉井基础,可应用于工程建设中,但根键的弯曲效应会降低基础的承载性能,故在设计中应提高根键的抗弯刚度。Based on the load transfer method and the Winkler beam theory,considering the bending effects of roots and reduced effects from the overlapping of roots,an elastic solution of bearing capacity of root-caisson with flexual roots is deducted.The computational values of displacement are close to the test results in elastic range.The vertical distributions of displacement and axial force curves are presented.We also analyze the bearing behavior of root and the proportion of each part of soil resistance.From the computational results,it is concluded that the bearing capacity of root-caisson is superior to the traditional caisson foundation,so the root-caisson can be utilized in the bridge engineering.However,as the bending effects of roots reduce the bearing capacity of root-caisson,improving the bending stiffness of roots is particular necessary.

关 键 词：根式沉井 受弯根键 承载性能 荷载传递法 弹性地基 

分 类 号：O343.3[理学—固体力学] TU473.2[理学—力学]