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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。
Through the experimental study on the soil properties by in situ exploration of soil and indoor soil, the residual deformation of the revetment under a large reclamation project is analyzed. Firstly, the dynamic characteristics and residual deformation of foundation soil under complex stress were studied by means of resonant column test and numerical simulation. The shear modulus ratio and damping ratio of soil samples with the bank revetment structure changed with the shear strain Curve relationship. Secondly, based on the analysis of the relationship between the residual deformation and the vibration times, the experimental data are collated and fitted by using the Shenzhujiang model, and the fitting parameters of the residual model of the Shenzhujiang are given. Finally, the law of residual deformation of revetment under earthquake is obtained, that is, under different acceleration time histories, the horizontal residual deformation is between 0.07-0.66m and the vertical residual deformation is between 0.035-0.31m. The main deformation Revetment on both sides of the location, the main soil layer of sand. The research results can provide basis for seismic design and deformation analysis of reclamation projects.