| Considering much property difference between pile material and soil materialsurrounding, Which make it possible to produce much shear stresses on the contact interfaceand cause displacement or fission, it is necessary to adopt one special constitutive law of thiskind of contact interface which can reflect its feature of loading and deformation thoroughly.On the basis of the deformation feature and constitutive laws of some contact interfaceobtained by Zhang Dongii and people concemed through some single-shear experiments oncontact interface between structure and soil, this paper not only expounds one new pile-soilthree-dimensional constant thickness contact interface model which can be used to analysispile loading feature with vertical load, also deduces its element stiffness matrix.With bad understanding of load imparting mechanism of super-long pile used widely insuper-high building, it is difficult to design them both safely and economically.Using the contact inierface element the paper present, paper carries out studies in detailon loading finite element analysis of single pile or group piles, especially of long andsuper-long pile on the basis of field geological draft. Moreover a lot of research results areobtained. Firstly, the paper studies all-round some effects, for example, pile length, pilediameter, pile elastic module, module of soil at the bottom of pile and so on, on the its P-Scurve, its bottom displacemetlt, bottom holding stress and its axial stress distributing curve.Secondly, the paper also studies in detail the effect of pile distance each other and pi1equanities on those of group piles present above.In addition to carrying out studies above, the paper also compiles several auxiliaryprograms. One of the aims is to resolve soil distribution featured by layer. Another is to dealwith the conjunction between data compiled and obtained by SAP software and input dataprogram, thus saving a lot of time spent in pre-process. |
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