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本文根据国家和地区规范、规程的相关规定,对深圳拟建第一高建筑(99层,高439m)桩(墩)基础微风化岩承载力特征值取值进行了计算。由计算结果可知,在同一孔径、桩长条件下,桩和墩其承载力特征值有1:0.56～1:0.70的关系,是混凝土强度设计值(桩身混凝土按C30)的1.2～2.0倍;另参考相关硬质岩石上桩的静载试验结果,提出该工程桩(墩)基础设计单桩承载力特征值建议按桩身混凝土强度控制的结论。
In this paper, according to the national and regional norms and regulations of the relevant provisions of the proposed first high-rise building in Shenzhen (99 layers, high 439m) pile (pier) bearing capacity of micro-weathered rock characteristic values were calculated. According to the calculation results, under the same aperture and pile length, the bearing capacity of pile and pier has a relationship of 1: 0.56 to 1: 0.70, which is 1.2 to 2.0 times of the design value of concrete strength (pile concrete according to C30) In addition, with reference to the static load test results of the piles on the hard rock, the conclusions that the eigenvalues of the single pile bearing capacity of the foundation piles proposed by this project are based on the concrete strength control of the pile are proposed.