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确定大直径扩底桩承载力的最直接的方法是静力载荷试验。但由于加载的困难和试验费用高等原因,静力载荷试验往往不可行。目前进行大直径扩底桩设计时通常借用建筑桩基技术规范的经验参数法,对大直径灌注桩端阻力值和侧阻力值折减确定,容易造成大直径扩底灌注桩的承载能力得不到充分发挥。结合大直径扩底桩的规范编写,对收集的完整试桩资料进行统计分析,并参考《建筑桩基技术规范》及北京、天津、浙江、福建、广东等地方给出的经验值,最终按不同扩底直径给出了端阻承载力特征值和侧阻承载力特征值的经验值表,并与各试桩的承载力实测值以及按桩基规范确定的承载力特征值进行比较,结果表明,本文建议的大直径扩底桩端阻力特征值和侧阻力特征值具有一定的可靠性和较大的适用性。
The most direct method to determine the bearing capacity of large diameter pile is the static load test. However, due to the difficulty of loading and high test costs, static load tests are often not feasible. In the current design of large-diameter expanded-bottom piles, the empirical parametric method of building pile foundation is often used to determine the reduction of the end resistance value and lateral resistance value of the large-diameter grouted pile, which easily leads to the failure of the large-diameter expanded bottom piles carrying capacity To give full play. Combined with the specifications of the large-diameter expanded pedestal, the statistical analysis of the collected data of the whole pedestal is carried out. With reference to the “Technical Specifications for Construction Piles” and the experience values given in places such as Beijing, Tianjin, Zhejiang, Fujian and Guangdong, The empirical values of the characteristic values of the end resistance and the characteristic values of the lateral resistance are given according to the different diameters. The results are compared with the actual values of the bearing capacity of the test piles and the characteristic values of the bearing capacity determined according to the pile foundation specifications. The results It is indicated that the characteristic values of the end resistance and the side resistance of the large-diameter end-piled pile proposed in this paper have certain reliability and great applicability.