考虑加筋与遮帘效应计算群桩沉降的相互作用系数法

发布时间：2018-11-10 11:51

【摘要】：群桩中各基桩在地基土中的加筋与遮帘效应是客观存在的,然而,在目前的桩基沉降理论与实践中,相关的研究仍显不足。基于剪切变形法理论,考虑桩的加筋与遮帘效应,求得各基桩在自身桩顶荷载作用下产生的沉降以及其引起相邻桩的附加沉降量,由此提出群桩中任两桩的相互作用系数简化公式,同时,也得到各基桩桩侧及桩端桩-土接触等效弹簧刚度,并基于荷载传递法原理,建立了成层地基条件下各基桩在自身桩顶荷载作用下的桩身位移平衡方程,推导出各土层层顶处桩身沉降、轴力与层底处桩身沉降、轴力之间的递推关系,进而将公式推广到高、低承台群桩基础计算中。工程算例分析表明,用该方法计算有较高的精度,求得的荷载-沉降曲线及两桩相互作用系数与实测值吻合较好;相互作用系数要明显小于弹性理论计算结果。
[Abstract]:The reinforcement and curtain effect of foundation piles in pile groups exist objectively, however, in the present theory and practice of pile foundation settlement, the relevant research is still insufficient. Based on the theory of shear deformation, considering the reinforcement and curtain effect of piles, the settlement of each pile under the load of its own top and the additional settlement caused by adjacent piles are obtained. Therefore, a simplified formula of interaction coefficient of any two piles in pile group is put forward. At the same time, the equivalent spring stiffness of pile side and pile-soil contact is obtained, and based on the principle of load transfer method, In this paper, the displacement equilibrium equation of each pile under its own pile top load is established, and the recursion relationship between the pile settlement at the top of each layer of soil, the settlement between the axial force and the bottom of the layer, and the axial force is derived. Then the formula is extended to the calculation of pile group foundation with high and low cap. The analysis of engineering example shows that the method has high accuracy, the calculated load-settlement curve and the interaction coefficient of two piles are in good agreement with the measured values, and the interaction coefficient is obviously smaller than the calculated result of elastic theory.
【作者单位】：福州大学岩土工程研究所;福建工程学院土木工程学院;卧龙岗大学土木采矿与环境工程学院;
【基金】：福建省自然科学基金资助(No.2011J01308)
【分类号】：TU473.1

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