Determination of the Constant Modulus of Horizontal Subgrade Reaction of Saturated of Sand Pile Based on p-y Curve
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摘要: 饱和砂土中侧向受荷桩的p-y曲线主要与内摩擦角φ有关,m法中的地基比例系数m值根据经验范围查表确定,没有与饱和砂土的特征指标内摩擦角φ建立联系。在相同的桩顶容许位移条件下将p-y曲线法计算出的桩顶水平荷载H0代入m法模型,可计算得到地基比例系数m值。通过大量计算,建立了饱和砂土中地基比例系数m值与内摩擦角φ、桩径d及桩顶位移等指标的相互关系,并将这些结果通过归纳整理形成公式与表格以方便查阅。研究结果表明:桩身结构刚度对上述关系的影响非常有限。在3个工程案例中,用文中方法确定的m值计算的桩顶容许水平承载力与测试结果比较,吻合程度较好。Abstract: The p-y curve for laterally loaded piles in saturated sand is related to the internal friction angle φ. However, the coefficient m used in the m-method is selected from empirical ranges in code tables and is not linked to φ. Under the condition of the same allowable pile-head displacement, the horizontal load H0 calculated by p-y curve method can be substituted into the m-method model to determine the corresponding m value. Based on extensive numerical calculations, relations were established among the internal friction angle φ, pile diameter, allowable pile-head displacement, and the coefficient m for saturated sand. These results were presented as formulas and tables to allow for convenient lookup. It was found that the stiffness of the pile shaft had a negligible influence on these relations. In three practical cases, the allowable lateral bearing capacities computed with the m values from this method showed good agreement with the measured results.
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