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选取不同加固土体参数,采用土体卸载条件下的HS(hardening-soil)有限元模型,分析了被动区加固对超大深基坑变形的影响。结果表明:深搅加固对墙体侧向位移的影响随深度增加而增大,可以最终减小墙体侧向位移达27%左右;在临近墙体局部范围内抑制坑底隆起效果显著,抑制隆起量最多超过50%;对墙背土体沉降抑制显著,局部降低60%左右。因此,根据不同地质条件和基坑变形控制要求,选择合理的加固形式使加固土体达到设计强度,既能保证基坑安全和环境影响的要求,又能节省造价。
The parameters of different reinforced soil are selected, and the hardening-soil (HS) finite element model is used to analyze the effect of passive zone reinforcement on the deformation of super deep foundation pit. The results show that the effect of deep stir reinforcement on the lateral displacement of the wall increases with depth, which can eventually reduce the lateral displacement of the wall to about 27%. In the vicinity of the wall, Uplift amount of more than 50%; on the back of the soil settlement significant inhibition, local reduction of about 60%. Therefore, according to different geologic conditions and deformation control requirements of foundation pit, selecting reasonable forms of reinforcement to make the reinforced soil reach the design strength can not only ensure the safety and environmental impact of foundation pit, but also save the cost.