本文選題：樁基礎 + 固結�。� 參考：《巖土工程學報》2015年03期

【摘要】：在地基固結和液化后再固結過程中,土體會對樁基礎產(chǎn)生負摩阻力。負摩阻力作用下樁基礎的軸力和沉降常采用中性面方法計算,但事實上中性面方法的幾個基本假定可能導致計算結果相對實際產(chǎn)生顯著偏差。針對地基固結和震后再固結過程中負摩阻力引起的樁基礎的軸力和沉降進行研究,采用隨固結過程更新樁土摩擦力峰值的非線性溫克爾地基梁方法,建立相應計算方法。該方法能夠充分考慮固結過程對樁基礎軸力和最終沉降的影響,并給出軸力和沉降的變化過程。與離心模型試驗對比的結果顯示,在采用合理的固結計算方式的基礎上,該方法能夠有效地計算地基固結和震后再固結過程中樁基礎的軸力與沉降,對沉降的計算精度高于傳統(tǒng)中性面方法。
[Abstract]:In the process of foundation consolidation and liquefaction, soil will produce negative friction to pile foundation. The axial force and settlement of pile foundation under negative friction are usually calculated by neutral plane method, but in fact, some basic assumptions of neutral plane method may lead to significant deviation between the calculated results and the actual situation. In this paper, the axial force and settlement of pile foundation caused by negative friction during consolidation and reconsolidation after earthquake are studied. The nonlinear Winkel beam method is used to update the peak value of friction between pile and soil with the consolidation process, and the corresponding calculation method is established. This method can fully consider the influence of consolidation process on the axial force and final settlement of pile foundation, and give the variation process of axial force and settlement. Compared with the centrifuge model test, the results show that the method can effectively calculate the axial force and settlement of the pile foundation in the process of consolidation and post-seismic consolidation on the basis of reasonable consolidation calculation method. The accuracy of settlement calculation is higher than that of traditional neutral plane method.
【作者單位】： 清華大學水沙科學與水利水電工程國家重點實驗室;美國加利福尼亞大學洛杉磯分校土木與環(huán)境工程系;
【基金】：國家自然科學基金項目(51038007,51079074)
【分類號】：TU473.1

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