深厚软弱地层坑内土体加固对支护结构变形的影响

为分析基坑内侧土体加固对支护结构水平位移的影响规律，将加固体及未加固土体视为复合土体，以弹性地基梁法为基础建立支挡结构的杆系有限元模型，结合工程实例计算分析土体加固参数对支护结构水平位移的影响。结果表明，支护结构水平位移随加固深度的增加而减小，且存在临界深度。当加固体的水泥掺量在0～15%范围内增加或置换率在0～0.5范围内增加，支护结构水平位移显著减小，加固效果显著；当水泥掺量大于15%或置换率大于0.5，支护结构水平位移变化较小，加固效能降低。

Effects of soil reinforcement on the deformation of the retaining structure of foundation pits in deep water-soaked soft stratum

In order to analyze the influence of the reinforcement on the horizontal displacement of the retaining structure of foundation pits, the reinforced soil and the original soil were considered as a composite soil body. Based on the elastic foundation beam theory, a finite element analysis model of the bars in the retaining structure was established. The effects of soil reinforcement parameters on the horizontal displacement were calculated and analyzed with engineering projects. The research results show that the horizontal displacement of the retaining structure reduces with the increase of the reinforcement depth, and there is a critical depth. When the cement content of the reinforced body increases within the range of 0~15% or its replacement rate increases within the range of 0~0.5, the horizontal displacement of the retaining structure is significantly reduced and achieved good reinforcement effects. When the cement content exceeds 15% or its replacement rate is greater than 0.5, there is little change in the horizontal displacement of the retaining structure and the reinforcement efficiency is significantly reduced.