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基于Meyerhof理论,提出了改进的桩顶埋入式垫层,推导出垫层极限桩土应力比的计算公式,并对桩顶埋入式垫层的作用机理进行了分析。研究发现:桩顶埋入式垫层可减少桩顶向上刺入量和地基沉降量,极限桩土应力比随刺入量的增加和垫层内摩擦角的增大而增大。提出了考虑桩顶垫层厚度及桩距影响的极限桩土应力比修正计算方法,推导了相应的计算公式和计算曲线,可供实际工程应用时查询。研究表明:修正后的埋入式垫层极限桩土应力比随桩顶预埋深度与垫层厚度之比的增加而增大,随桩距的增加而减小。通过算例分析,认为桩顶埋入式垫层具有垫层厚度和预埋深度可双向调节的优点,可用于调节复合地基应力和控制差异沉降,并可作为高层建筑地基变刚度调平设计的手段。
Based on the theory of Meyerhof, an improved submerged underlay was proposed, and the formula for calculating the stress ratio of the submerged pile was deduced. The action mechanism of submerged underlay was analyzed. The results show that the submerged pile cap can reduce the upward piercing amount of pile top and the settlement of foundation, and the ultimate stress ratio of pile and soil increases with the increase of piercing amount and the increase of internal friction angle of the cushion. The calculation method of the stress ratio of the limit piles considering the influence of the thickness of the pile top and the influence of pile spacing is put forward. The corresponding calculation formulas and calculation curves are deduced, which can be used for practical application. The results show that the stress ratio of the buried piles with the limit piles increases with the ratio of the depth of the top piles to the thickness of the piles, and decreases with the increase of pile spacing. Through the example analysis, it is considered that the pile cap embedded cushion has the advantages of cushion thickness and embedded depth can be adjusted bidirectionally. It can be used to adjust the composite foundation stress and control the differential settlement, and can be used as leveling stiffness of the foundation of building means.