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某工程球罐场地为在沿海深厚软土地基上大面积填土形成,球罐基础为环形群桩基础,桩型钻孔灌注桩,具有端承长桩的特点。地面沉降观测发现环形端承群桩基础中间的地面沉降要小于周围地面,这反映了桩身负摩阻力对桩间土的影响。用数值方法在模拟桩间土沉降特性基础上再分析桩身负摩阻力特性,并与根据现行规范方法计算的结果进行比较,得到了一些有益的结论,为桩基负摩阻力的研究提供了新思路。
A project for the construction of spherical tank site is a large area of coastal soft soil foundation fill formation, spherical tank base for the annular group pile foundation, pile-type cast-in-situ piles, with end bearing long piles. Subsidence observation shows that the ground subsidence in the annular bearing group pile foundation is less than that in the surrounding ground, which reflects the negative pile friction influence on the soil between the piles. Based on the numerical simulation of the settlement characteristics of soil between piles, the negative skin friction characteristics of the pile are analyzed and compared with the results calculated according to the current normative method. Some useful conclusions are obtained, which provide the research results of the negative friction of pile foundation New ideas.