等截面抗拔桩的极限承载力计算综述

发布时间：2018-06-09 00:44

本文选题：桥梁工程 + 抗拔桩　；参考：《公路交通科技》2014年06期

【摘要】：为更好地应用抗拔桩,以其极限承载力的计算方法为研究对象,分析承载力计算值与实测值差异较大的问题,基于变形破坏面形式对抗拔桩极限承载力计算方法进行分析,并结合现场试验,对各种方法计算结果进行了对比研究。结果表明:标准模型,Meyerhof模型和Das模型均忽略桩的自重,计算值偏小,适用于长径比不大的抗拔桩;Chattopadhyay模型计算方法可行,但过程较复杂,适合砂性土层,Shanker模型考虑桩入土深度与桩径比值的关系,当比值大于20时计算具有一定的适用性;倒圆锥台考虑了桩的自重,Kotter模型基于Kotter方程计算,水平条分法假设破坏面为曲面,并根据极限平衡理论计算承载力,其计算值均与Vesic测试试验结果比较接近,且适用于各种土层条件下承载力的计算,均可作为计算等截面抗拔桩极限承载力的方法。
[Abstract]:In order to better apply the uplift pile, taking the calculation method of its ultimate bearing capacity as the research object, the paper analyzes the problem that the calculation value of the bearing capacity is quite different from the measured value, and based on the deformation failure surface form, the calculation method of the ultimate bearing capacity of the pile is analyzed. Combined with the field test, the calculation results of various methods are compared and studied. The results show that both the Meyerhof model and the Das model ignore the weight of the pile, and the calculated values are small, which is suitable for the Chattopadhyay model with a small aspect ratio, but the process is complicated. The Shanker model is suitable for sand soil layer to consider the relationship between pile depth and pile diameter ratio, and when the ratio is greater than 20:00, it is suitable for calculation, and the inverted cone table considers the deadweight of pile and the Kotter model is calculated based on Kotter equation. The horizontal strip method assumes the failure surface as a curved surface and calculates the bearing capacity according to the ultimate equilibrium theory. The calculated values are close to the results of Vesic test, and are suitable for the calculation of bearing capacity under various soil conditions. It can be used as a method to calculate the ultimate bearing capacity of uplift piles with equal cross-section.
【作者单位】：东南大学土木工程学院;东南大学混凝土及预应力混凝土结构教育部重点实验室;
【基金】：国家重点基础研究发展计划(九七三计划)资助项目(2013CB036304) 交通运输部课题(2013319759060)
【分类号】：U443.15

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