某大型填海造地工程护岸地基动力特性及残余变形研究

Research on Dynamic Characteristic and Residual Deformation of Revetment Foundation of a Large-scale Sea Reclamation and Land Stretch Project

通过海上原位勘探取土和室内土体动力特性试验研究,对某大型填海造地工程护岸结构进行地震作用下残余变形的分析。首先,利用共振柱试验和数值模拟的方法,研究了地基土在复杂应力状态下的动力特性及残余变形,得出了此护岸结构土样的剪切模量比和阻尼比随剪应变变化的曲线关系。其次,在分析残余变形与振次之间关系等的基础上,利用沈珠江模型对试验数据进行整理和拟合,给出了沈珠江残余模型的拟合参数值。最后,得出地震作用下护岸结构残余变形的规律,即在不同的加速度时程下,水平残余变形量在0.07~0.66m之间,竖向残余变形量在0.035~0.31m之间,变形主要在两侧护岸位置,主要的土层为砂土层。研究成果可为填海造地工程抗震设计和地基变形分析提供依据。

Based on exploration and taking soil in situ of sea, and soil mass dynamic behavior test research indoors, the residual deformation of revetment structure of a large-scale sea reclamation and land stretch project under earthguake action was analyzed. At first, the dynamic characteris- tics and residual deformation of foundation soil under complex stress state was researched by res- onant column test and numerical simulation methods. Based on this, the change of shear modulus ratio and damping ratio of soil sample with shear strain were obtained. Then through analysis of relationship between residual deformation and vibrational times, and data arrangement and fitting by using Shen Zhujiangrs model,the fitting parameters of Shen Zhujiang^s model were given. Fi- nally, residual deformation rule of revetment structure under earthquake action are obtained, i. e. for different acceteration time histories, the horizontal residual deformation is from 0. 07 m to 0.66 m, the vertical residual deformation is from 0. 035 m to 0.31 m. The deformation exists mainly at both side revetment and the soil layer is mainly sand soil layer. The research findings of this paper may give a reference to relevant seismic design and foundation deformation analysis of sea reclamation and land stretch projects.