介绍一种特殊的双排桩围护结构,为了了解该围护结构周围的地面沉降,有效地控制该围护结构周围地面的变形,运用有限元法分析该结构基坑的周围地面沉降情况,通过对比说明该双层围护结构的使用起到了降低基坑周围地面沉降的作用.对该双层结构设计参数进行分析,分析表明,基坑周围地面沉降量随两道围护结构叠加深度和内部围护结构嵌入比的增加而减小,当基坑外超载5～10 kN/m2和20～30 kN/m2时超载影响范围分别为0.5和1倍的开挖深度.支撑刚度的增加能够有效地降低基坑周围地面沉降量.分析得到的基坑外侧最大沉降量与内外结构间距大致呈线性关系.%A special double-row structure supported foundation pit was introduced. Finite element analysis was performed to analyze the surrounding ground settlement of the foundation pit in order to provide valuable insights into the surrounding settlement and the methods to reduce the settlement. Results show that existence of inner support structure greatly reduces the settlement. The effect of different design parameters of inner support structure on the surrounding ground settlement was analyzed by parametric studies. Results show that the settlement decreases with the increasing overlapping length of the two support walls and embedment ratio of the inner wall. The influence distances for the surcharge of 5-10 kN/m2 and 20-30 kN/m2 are 0. 5 and 1 times of the excavation depth, respectively. The increase of the strut stiffness can also decrease the surrounding settlement. In addition, the maximum settlement surrounding the foundation pit is approximately linear functions of the spacing between the two walls.
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