堆载和桩顶荷载组合作用下的桩土响应分析

发布时间：2018-03-26 01:24

本文选题：堆载　切入点：桩顶荷载　出处：《中南大学学报(自然科学版)》2017年01期

【摘要】：桩侧负摩阻力是影响桩基工作性能的重要因素,而堆载和桩顶荷载对桩侧摩阻力的分布影响很大,为了研究其组合作用机理,采用拉格朗日差分法分析堆载和桩顶荷载组合作用下桩侧摩阻力分布、中性点位置变化规律以及桩体轴力分布。研究结果表明:负摩阻力主要出现在0.37~0.64倍桩长位置;当堆载小于或等于60 k Pa时,负摩阻力沿桩身向下先增大后减小并逐渐过渡到正摩阻力;当堆载大于60 k Pa时,负摩阻力沿桩身向下逐渐减小然后过渡到正摩阻力;桩体最大轴应力与堆载和桩顶荷载具有明显的二元线性相关性;中性点位置变化规律受桩顶荷载和堆载组合值的影响,根据此规律得出二元方程式,可用于快速估算中性点的位置。
[Abstract]:The negative frictional resistance of the pile side is an important factor affecting the working performance of the pile foundation, while the pile load and the pile top load have a great influence on the distribution of the pile side friction. The Lagrangian difference method is used to analyze the lateral friction distribution of pile under the combination of pile load and pile top load, the variation law of neutral point position and the axial force distribution of pile body. The results show that the negative frictional resistance mainly occurs in the position of 0.37 ~ 0.64 times the length of pile. When the heaped load is less than or equal to 60 KPA, the negative frictional resistance increases first and then decreases along the pile body and then decreases to the positive frictional resistance gradually, and when the heaped load is greater than 60 KPA, the negative frictional resistance decreases gradually along the pile body and then to the positive friction resistance. The maximum axial stress of pile body has obvious binary linear correlation with pile load and pile top load, and the variation law of neutral point position is affected by pile top load and pile load combination value, according to which the binary equation is obtained. It can be used to estimate the position of neutral point quickly.
【作者单位】：中南大学资源与安全工程学院;
【基金】：国家自然科学基金资助项目(51274249) 教育部博士点基金资助项目(20120162110009)~~
【分类号】：TU473.1;TU435

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