在时间单元上用拉格朗日插值函数构造近似解。
In each time element, approximate solution is constructed by the Lagrangian interpolation functions.
在此基础上，结合拉格朗日插值函数推导出了考虑施工顺序及遮栏效应的群桩挤土位移场的解析解。
Based on the analytical expressions of singe pile and Lagrange interpolating function, the closed-form analytical expressions of displacement fields of soil around jacked group piles were derived.
利用罗尔中值定理给出了函数与其拉格朗日插值函数间的关系，得到中值定理的另外一种形式，并给出了它的应用。
Another form about the median theory and its application is put forward according to the relation between the function and its Lagrange interpolation function in accordance with Rolls median theory.
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