论文部分内容阅读
群桩中各基桩之间的加筋与遮帘效应和桩端土体变形是群桩沉降计算中的关键部分,极大地影响计算结果的准确性,然而,目前相关的研究仍显不足。采用剪切位移法原理分析了各基桩之间的加筋与遮帘效应,通过荷载传递法原理推导出层状地基土中各基桩桩底、顶之间的沉降与轴力关系式;基于虚土桩模型,探讨了虚土桩长度的影响因素并给出了定量计算公式,得到了层状地基土中各虚土桩顶、底之间的沉降与轴力关系式;利用基桩与虚土桩的边界条件和平衡关系确定柔度系数矩阵,进而根据不同的承台形式求得群桩沉降。工程案例计算表明,理论计算与实测值吻合较好,该方法具有较高的准确性。其研究结果对群桩沉降计算理论的发展具有一定的补充和推动作用。
The reinforcement and blind effect between pile foundations in pile groups and the deformation of pile-soil are the key parts in the settlement calculation of pile groups, which will greatly affect the accuracy of calculation results. However, the relevant research is still insufficient. The shear displacement method is used to analyze the effect of reinforcement and blind between foundation piles. The relationship between settlement and axial force of pile foundation and top of each foundation pile in layered soil is deduced by load transfer method. Based on the model of virtual soil piles, the influencing factors on the length of virtual soil piles were discussed. The formula of quantitative calculation was given, and the relationship between the settlement and axial force of the top and the bottom of virtual soil piles in layered soil was obtained. According to the boundary conditions and the equilibrium relationship between the soil and soil piles, the matrix of the flexibility coefficient is determined, and then the settlement of pile groups is obtained according to the different caps. The engineering case calculation shows that the theoretical calculation is in good agreement with the measured value, and the method has high accuracy. The results of this study can supplement and promote the development of settlement theory of pile groups.