大连临空产业园填海造地工程砂土残余变形试验研究

Research on the Residual Deformation of Sandy Soil of Land Reclamation in Airport Industrial Park in Dalian

采用中国地震局工程力学研究所研制的DSZ-Ⅰ型电磁振动三轴仪对大连临空产业园工程场地的土样(浅层砂和深层砂)进行动力特性试验,研究两种砂土在复杂应力状态下的动力残余变形特性。试验结果表明:残余体应变和残余剪应变都随着动应力比和围压的提高而增大,动应力比和围压的影响对残余体应变和残余剪应变的影响规律是一样的;残余体应变随着固结比的提高而减小,而残余剪应变随着固结比的提高而增大,残余体应变的固结比对于试验结果与拟合结果的影响较大,而残余剪应变固结比对于试验结果与拟合结果的影响较小;残余体应变和残余剪应变的Cvr与动应变幅值较好满足线性关系,离散性非常小,而Cdr/S21与动应变幅值关系的离散性则比较大。并给出了地基震陷分析所需的沈珠江模型参数。研究成果可为大连临空产业园填海造地工程抗震设计和地基震陷变形分析提供依据,也可作为其它类似填海造地工程的设计参考。

We conducted dynamic characteristic tests on sandy soil samples collected from Dalian Airport Industrial Park,adopting the DSZ-1-type electromagnetic vibration triaxial apparatus de-veloped by Engineering Mechanics,China Earthquake Administration.Sandy soils are character-ized by strong permeability,high shear strength,small deformation,and subsidence.This test in-vestigated the dynamic residual deformation characteristics of two types of sand（i.e.,shallow and deep sand）under a complex stress state.Increasing the dynamic stress ratio and confining pressure improved the residual volumetric strain and residual shear strain,and the influences of both quan-tities on both strains could be described by the same law.However,the consolidation ratio was re-duced by increasing the residual volumetric strain,and increased by increasing the residual shear strain.While the consolidation ratio of residual volumetric strain significantly affected the fitting results,that of the residual shear strain exerted small impact.The influences of consolidation ratio on the residual volumetric strain and residual shear strain were significantly different.The C vr was linearly related to the dynamic strain amplitude of residual volumetric strain as well as residual shear strain,and the discreteness was very small.In contrast,the relationship between C dr/S 21 and the dynamic strain amplitude had a relatively large discreteness.From the test results,we derived the fundamental Shen Zhujiang model parameters for analyzing seismic subsidence.The results may provide a foundation for the deformation analysis of subsidence at Dalian Airport.They may also guide industrial park land reclamation engineering and seismic design on earthquake-prone ground,and are applicable to similar engineering designs.