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为研究武汉市软土地区深基坑被动区加固尺寸对支护桩变形的影响,对武汉市某深基坑工程施工监测数据进行分析,采用MIDAS有限元二维数值模拟的方法,重点研究了支护桩水平位移随被动区加固参数的变化规律。与实测值对比分析的结果表明,数值模拟可较好地分析支护桩的实际变形规律;被动区加固可有效减缓支护桩变形;被动区加固深度、宽度都存在一个最优参数,当超出该参数后,加固效果将不再显著提升;被动区阶梯式加固较其他加固形式有明显的优势。
In order to study the influence of the reinforcement area of the deep excavation in Wuhan soft soil area on the deformation of supporting piles, the monitoring data of construction of a deep foundation pit in Wuhan are analyzed. By using the two-dimensional numerical simulation method of MIDAS finite element method, Variation of Horizontal Displacement of Supporting Pile with Reinforcing Parameters in Passive Area. The results of comparison with the measured values show that the numerical simulation can well analyze the actual deformation law of the supporting pile. The passive zone reinforcement can effectively reduce the deformation of the supporting pile. There is an optimal parameter for the depth and width of passive zone reinforcement. After this parameter, the reinforcement effect will no longer be significantly improved; step-by-step passive reinforcement has obvious advantages over other reinforced forms.