迭代增量法分析地下连续墙的受力性状

围护结构的位移是影响土压力的重要因素，目前深基坑中地下连续墙分析时采用的增量法没有考虑墙体位移对增量荷载的影响。根据墙体位移对增量荷载的影响，假设在每一步开挖过程中围护墙体位移不变，由此确定初始增量荷载。根据计算得到的位移，用迭代法对增量荷载进行修正，分析地下连续墙的变形和内力。最后，通过与实测资料的对比，证实了迭代增量法的合理性。

Analysis of underground diaphragm wall by iterative incremental method

The displacement of braced structure is the important factor, which affects the earth pressure. Now, in the calculation of underground diaphragm wall in the deep excavation, the effect of displacement is not accounted in the incremental method. In this paper, based on the effect of displacement on the incremental load, on the assumption that the displacement of underground diaphragm wall is invariable in every excavation, then, the initial incremental load is calculated. According to the calculated displacement, the incremental load is modified by the iteration method; the displacement and internal force of underground diaphragm wall are calculated. With the contrast to the results of in-situ measurement, the rationality of the iterative incremental method is demonstrated.