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本文通过上海地区三个工程中五根超长(约60m)609径钢管柱静荷试验,分析了该种桩的承载力问题。根据42组试验数据,回归统计得到桩顶荷载与沉降之间的关系式:S=0.00016P~(1.46);根据对桩的极限荷载的分析,认为超长609径钢管桩如桩管材料本身有足够的强度,桩的入土深度在60m左右,则单桩的极限荷载将超过6000kN,并可根据上海地基规范按摩擦桩来估算桩的承载力:文中指出了在桩的静荷试验过程中桩顶受力存在不均匀现象,其不同点的应力差值达25％;此外,本文也分析了按弹性方法分析计算桩位移时需要的地基土弹性模量E值,并根据部分实测数据反算了E值。发现E与荷载P可近似视成线性关系,其关系式为:E=33-0.0057P。
This paper analyzes the bearing capacity of this type of pile through the static load test of five ultra-long (about 60m) 609-diameter steel tubular columns in three projects in Shanghai. According to the 42 sets of experimental data, the relation between load and settlement at the pile top was obtained by regression statistics: S=0.00016P~(1.46); based on the analysis of the ultimate load of the pile, the ultra-long 609-diameter steel pipe pile such as pile pipe material was considered. If there is enough strength in the pile and the depth of the pile into the soil is about 60m, the ultimate load of the single pile will exceed 6000kN, and the bearing capacity of the pile can be estimated according to the Shanghai foundation code according to the friction piles: the static load test process of the pile is pointed out in the paper. There is non-uniform force in the middle pile top, and the stress difference at different points is up to 25%. In addition, this paper also analyzes the elastic modulus E value of foundation soil required for the calculation of pile displacement by elastic method, and according to some measured data. Inverse E value. It was found that E and the load P can be regarded as approximately a linear relationship, and its relation is: E=33-0.0057P.