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（北京市勘察設(shè)計(jì)研究院有限公司， 北京 100038）

［摘要］大面積荷載下非飽和軟土場(chǎng)地單樁負(fù)摩阻力在采用《建筑樁基技術(shù)規(guī)范》（JGJ 94—2008）進(jìn)行計(jì)算時(shí)，會(huì)遇到樁側(cè)軟弱土層深度確定困難、負(fù)側(cè)摩阻力分布形式與該規(guī)范建議方法確定的形式有差異等問(wèn)題，導(dǎo)致基樁負(fù)摩阻力計(jì)算困難。為解決上述問(wèn)題，基于《建筑樁基技術(shù)規(guī)范》（JGJ 94—2008）對(duì)正負(fù)側(cè)摩阻力規(guī)定或推薦的做法，國(guó)內(nèi)外對(duì)單樁負(fù)側(cè)摩阻力的研究、實(shí)測(cè)成果，結(jié)合某工程場(chǎng)地形成后大面積填土荷載作用條件及地層分布等，建立了大面積荷載作用下基樁負(fù)側(cè)摩阻力分布的概念模型；基于實(shí)測(cè)樁側(cè)土變形數(shù)據(jù)，對(duì)場(chǎng)區(qū)土層的變形數(shù)據(jù)進(jìn)行對(duì)數(shù)曲線(xiàn)擬合，確定場(chǎng)區(qū)沉降計(jì)算經(jīng)驗(yàn)系數(shù)及樁側(cè)土固結(jié)度，并以此來(lái)計(jì)算樁及樁側(cè)土考慮時(shí)間效應(yīng)的分層沉降，然后基于樁及樁側(cè)土變形相等的原則確定考慮時(shí)間效應(yīng)的中性點(diǎn)。最后給出了大面積荷載下單樁負(fù)摩阻力計(jì)算的具體方法和步驟。以某工程項(xiàng)目為例的實(shí)際計(jì)算結(jié)果表明，所述方法對(duì)大面積荷載下單樁負(fù)摩阻力計(jì)算具有較強(qiáng)的工程實(shí)踐及應(yīng)用價(jià)值。

［關(guān)鍵詞］大面積荷載；單樁；非飽和軟土；負(fù)摩阻力；概念模型；時(shí)間效應(yīng)

中圖分類(lèi)號(hào)：TU433文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2021)06-0123-06

Calculation method of negative friction resistance of single pile considering time effect on unsaturated soft soil site under large-area load

XUE Xiang, ZHU Chunjie, ZHENG Yi, CHEN Yuanhao, HOU Dongli, YANG Suchun, ZHOU Honglei

（BGI Engineering Consultants Ltd., Beijing 100038, China）

Abstract:When Technical code for building pile foundation（JGJ 94—2008）is used to calculate of the negative friction resistance of single pile in unsaturated soft soil site under the large-area load, problems such as difficulties in determining the soft soil layer deep on the pile side and differences between the form of negative friction resistance distribution and the form of negative friction resistance determined by the recommended method of the code are encountered, which result in difficulties in calculating the negative friction resistance of foundation piles. In order to solve the above-mentioned problems, based on the practice of Technical code for building pile foundation（JGJ 94—2008）on the regulation or recommendation of positive and negative friction resistance, the research on the negative friction resistance of single pile at home and abroad, the measured results, the large-area load acting conditions and the load distribution after the site formation of a certain project, etc., the conceptual model of the distribution of the negative  friction resistance under the action of a large-area compacted fill load was established. Based on the measured pile side soil deformation data, the deformation data of the soil layer in the field area were subjected to logarithmic curve fitting, the empirical coefficient of the settlement calculation of the field area and the consolidation degree of the pile-side soil were determined, which was used to calculate the layered settlement of the pile and the pile-side soil taking into account the time effect of consolidation, and then the neutral point was determined taking into account the time effect based on the principle that the pile and the pile side soil are equal to the deformation. Finally, the calculation method and the step of the negative friction resistance of single pile under the large-area load was given. The actual calculation results of an engineering project as an example show that the method described has strong engineering practice and application value for the calculation of negative frictional resistance of single piles under large-area loads.

Keywords:large-area load;single pile;unsaturation soft soil;negative friction resistance;conceptual model;time effect

作者簡(jiǎn)介：薛祥，碩士，高級(jí)工程師，Email:snowmatic@126.com。