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(上海大學(xué)土木工程系，上海 200072)

［摘要］基于超長樁試驗(yàn)資料，采用考慮負(fù)摩阻力作用的廣義雙曲線荷載傳遞模型反映樁側(cè)土彈塑性、軟化與穩(wěn)定三階段工作特性，樁端采用雙曲線荷載傳遞模型模擬土體的非線性變形特性，并且引入Mindlin解以考慮樁側(cè)摩阻力在樁端處產(chǎn)生的樁端位移，從而建立了層狀軟土地基中超長樁荷載傳遞分析理論。該理論可用于計(jì)算多層地基中超長樁的樁側(cè)阻力、沉降以及極限承載力，也可用于分析層狀地基中超長樁的荷載傳遞規(guī)律。通過工程實(shí)例計(jì)算與實(shí)測對比分析，可知計(jì)算得到的荷載-沉降曲線與實(shí)測的曲線較為吻合，因此該理論可作為確定樁承載力的依據(jù)。該理論可靠、方法簡單，且具有較好的適用性。

［關(guān)鍵詞］負(fù)摩阻力；超長樁；廣義雙曲線荷載傳遞模型；側(cè)阻軟化；層狀地基

Load transfer calculation of super-long piles considering negative friction

Chen Jun, Yao Wenjuan(Department of Civil Engineering, Shanghai University, Shanghai 200072, China)

Abstract:Based on the test data of super-long pile, the general hyperbolic load transfer model taking account of negative friction was used to reflect the performance characteristics of the pile side soil in nonlinear, softening and stabilization stages. The hyperbolic load transfer model was used for the pile end to simulate the nonlinear deformation properties of soil. The Mindlins solution was adopted to calculate the pile end displacement at lateral friction resistance. The analytical theory of load transfer for super-long piles in stratified soft soil foundation was established, which could be used not only to calculate lateral friction resistance, settlement and bearing capacity of super-long piles in stratified foundation, but also to analyze the load transfer law of super-long piles. Comparison of calculated results and measured data shows the derived load-settlement curve is closely agree with testing results. The theory can be used for determining the bearing capacity of super-long piles, and it is theoretically reliable, simple in application and useful in practice.

Keywords:negative friction; super-long piles; general hyperbolic load transfer model; lateral friction resistance softening

作者簡介：陳君，碩士研究生，Email