邓肯- 张参数对基坑支护结构变形的敏感性研究

针对三维热化学非平衡辐射流场设计了基于非结构网格的数值计算方法. 根据原子分子光谱 理论逐条计算了100$\sim$1\,500\,nm间N, O, N$^{ + }$, O$^{ + }$的谱线以及N邓肯-;张E-υ模型;敏感性分析;基坑;有限元Duncan - Chang E-υmodel;Sensitivity analysis;Foundation p it;Finite elementmethod;p iles2007-08-302007-11-12有限单元法是计算基坑开挖支护结构变形的常见的数值计算方法,其土体模型参数的准确性是计算结果可靠性高的保证。邓肯- 张E-υ模型是岩土工程分析计算中常用的一种非线性弹性模型。本文以双排桩支护结构为例,针对模型参数敏感性进行大量非线性有限元计算,计算结果表明:影响基坑支护结构变形的主要参数为k、G、Rf和n,随着G、Rf和n的增大,侧向位移增大;随着k的增大,侧向位移减小。对于弯矩而言,参数的变化对弯矩的影响较小。从整体来看,邓肯- 张参数对侧向位移的敏感性要大于对弯矩的敏感性。

SENSIBIL ITY ANALYSES OF THE DUNCAN - CHANG MODEL PARAMETERS TO DEFORMATION OF SUPPORTING STRUCTURE FOR FOUNDATION PIT

Soilmodel parameters are critical in assuring reliability of numerical results of commonly used finite elementmethod for simulating deformation of supporting structure for deep foundation p it. The Duncan - Chang E-υ model, a nonlinear elastic modelwidely used in the geotechnical engineering, is chosen in this paper. A retaining structure with double - row p iles is used as an examp le for the sensibility analyses. The results show that the main parameters influencing the deformation of supporting structure are k、G、Rf and . The increase of G、Rf or n can result in an increase in the disp lacement and the increase of k can result in the decrease of the disp lacement. On the whole, the sensibility of the Duncan - ChangModel Parameters to the disp lacement is greater than the sensibility to the moment in the structure.