考虑地基液化后大变形的桩-土动力相互作用分析  

Pile-soil dynamic interaction analysisconsidering large post-liquefactionground deformation

作　　者：张建民[1] 王刚[1] 

机构地区：[1]清华大学水利水电工程系,北京100084

出　　处：《清华大学学报（自然科学版）》2004年第3期429-432,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金 (59979012);北京市自然科学基金 (8011002)

摘　　要：地基液化后的侧向变形是导致桩基础震害的主要原因之一。该文给出了1995年日本阪神地震中水平地基液化后的侧向大变形对桩基础破坏作用的调查结果;在能统一描述饱和砂土液化前后尤其是液化后的大剪应变响应的本构模型的基础上,采用Penzien简化法建立桩一土相互作用计算模型,对该震害实例进行了计算分析。分析结果表明,考虑地基液化后剪应变分量的桩基础变形的计算值和实测值符合较好,液化后的剪应变分量控制着桩基础的残余变形。Large post-liquefaction lateral deformation of liquefied ground can greatly damage piles embedded. An example from the 1995 Hyogoken-Nambu earthquake was investigated and modeled. An effective stress model developed to represent saturated sand behavior for small to large shear strains during the whole liquefaction process was combined with Penzien's simplified pile-soil interaction analysis in a numerical model. The large shear strains produced after initial liquefaction were found to be the main factor controlling the residual deformation of the piles. The results computed by the numerical model taking into account the shear strains after initial liquefaction agreed well with the observed strains.

关 键 词：桩基础 相互作用 液化变形 震害调查 桩-土动力 地震 

分 类 号：TU473[建筑科学—结构工程]