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为掌握基坑开挖过程中支护桩力与位移的变化规律及其相互关系,在弹性地基梁计算理论的基础上,考虑桩-土相对位移影响,根据支护桩水平支撑的设置情况将基坑的开挖分解为不同阶段,结合初参数法推导得出了开挖过程中支护桩水平位移、转角位移、弯矩和剪力沿桩身分布的计算公式。工程实例表明:计算值与实测值接近,该方法能很好的计算出支护桩在开挖过程中力与位移的变化规律,对基坑工程的设计、施工和施工过程中的监测具有指导意义。
In order to grasp the variation regularity and mutual relationship of supporting pile force and displacement during the process of excavation, based on the calculation theory of elastic foundation beam, considering the relative displacement of pile-soil, according to the setting of horizontal support of supporting pile, The excavation of foundation pit is decomposed into different stages, and the formulas of horizontal displacement, angular displacement, bending moment and shear distribution along the pile body during excavation are deduced based on the initial parameter method. The engineering example shows that the calculated value is close to the measured value, and this method can well calculate the variation law of the force and displacement during the excavation of the supporting pile and provide guidance to the design, construction and construction monitoring of the foundation pit engineering significance.