樁基貫入過程中土體大變形分析與流動機理研究
[Abstract]:The problem of large soil deformation is a difficult problem in marine geotechnical engineering. Because of its large deformation gradient and complex flow mechanism, the conventional geotechnical engineering analysis method has obvious limitations in solving this problem. Therefore, this paper studies the analytical method for solving the problem of large deformation of soil, that is, Strain Path Method (SPM) and Shallow Strain Path Method (SSPM), introduce the calculation principle of these two methods in detail. Based on the theory of large strain and small strain, SSPM is used to analyze the flow mechanism and displacement field of soil around the pile foundation in the process of penetration. Finally, the results of SPM and SSPM are compared and analyzed, and the relationship between them is clarified. Based on the theory of large strain, the displacement field calculated by SSPM is in good agreement with the result given by Sagaseta, which verifies the accuracy of the calculated results. The results show that the uplift occurs in the upper part of the pile, and the displacement of the soil near the pile end and at the bottom of the pile has the subsidence displacement, and the maximum displacement of the soil is reached at the depth of penetration. At radial position r/R=3 (1 times diameter from pile wall), the calculation results based on the theory of large strain and small strain are in good agreement. The research results are helpful to understand the large deformation characteristics of soil and provide basic data for the verification of numerical results.
【作者單位】: 中海油研究總院;中國科學院力學研究所;
【基金】:中國海洋石油總公司科技項目(ZHKY-2013-ZY-05) 中國博士后科學基金項目
【分類號】:TU473.1
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