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在非饱和及饱和粉土两种不同土质中进行了埋深比分别为1、2、3、5四种的扩底桩抗拔大尺寸模型试验,得到了桩头荷载-位移曲线,通过s-logt法确定各桩的极限抗拔承载力,分析了饱和度及埋深比对扩底桩极限抗拔承载力的影响。使用《架空送电线路基础设计技术规定》、《建筑桩基技术规范》中推荐的计算方法及国外相关计算方法,采用原位CPT测试、考虑非饱和粉土基质吸力的影响及查表得到的土体参数分别对试验桩进行了极限抗拔承载力计算。通过计算结果与试验结果的对比,指出了采用不同土体参数时扩底桩极限抗拔承载力各计算方法的适用性。
In two different soil types, unsaturated soil and saturated silt, depth-to-depth ratio of 1, 2, 3, 5 and 4 kinds of pile enlarged pull-out large-scale model tests were carried out and the pile load-displacement curve was obtained. -logt method to determine the ultimate pull-out bearing capacity of each pile, analyzed the effect of saturation and buried depth ratio on ultimate pull-out bearing capacity of expanded-pile. Using the calculation methods proposed in “Technical Specifications for Design of Overhead Transmission Lines”, “Technical Specifications for Construction Pile Foundations” and relevant calculation methods in foreign countries, the in situ CPT test is used to consider the influence of unsaturated silt matrix suction and the result of look-up table Soil parameters were calculated for the ultimate tensile strength of the test pile. By comparing the calculated results with the experimental results, the applicability of each calculation method of ultimate pull-out bearing capacity of expanded-piles with different soil parameters is pointed out.