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增强体强度等级是复合地基设计的一个重要参数。增强体强度计算时需确定单桩承载力特征值,而单桩承载力特征值确定应同时满足复合地基承载力和变形要求,并取承载力和变形计算中确定的单桩承载力特征值的较大值作为增强体强度计算的依据;对高粘结强度桩,增强体采用商品混凝土时,桩身强度的确定不应采用混凝土立方体抗压强度平均值fcu,而应采用混凝土立方体抗压强度标准值fcu,k,即桩身强度计算公式应为fcu,k=4λRa/Ap。按照《建筑地基处理技术规范》(JGJ 79—2012)要求,复合地基工程验收时要求进行单桩静载荷试验,本文分析了静载荷试验中影响单桩承载力的因素,并给出复合地基设计计算时单桩承载力特征值取值的建议。
Reinforced body strength grade is an important parameter of composite foundation design. In order to calculate the strength of single body, the eigenvalues of single pile should be determined, while the eigenvalues of single pile should meet the requirements of bearing capacity and deformation of composite foundation at the same time. The eigenvalues of bearing capacity of pile Larger value as the basis for strengthening the body strength calculation; high bond strength of the pile, reinforced with commercial concrete, pile strength should not be used to determine the average compressive strength of concrete cubes fcu, and should be used concrete cubical compressive strength The standard value fcu, k, that is, the formula of pile body strength should be fcu, k = 4λRa / Ap. According to the requirements of Technical Code for Construction of Foundation (JGJ 79-2012), static load test of single pile is required for acceptance of composite foundation engineering. This paper analyzes the factors that affect the bearing capacity of single pile in static load test and gives the design of composite foundation Proposal for Calculating the Value of Bearing Capacity of Single Piles.