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针对良志嘉年华二期项目,基于地下水渗流的基本规律和土体受力的本构模型,建立了渗流场与应力场耦合下的有限元模型,通过PLAXIS有限元软件进行了数值模拟分析,对考虑降水作用和未考虑地下水作用影响的两种情况下,复合土钉柔性支挡结构体系的位移进行探讨,为保证分析的精度,模型采用15节点三角形单元.分析结果表明:在考虑了降水作用时,基坑的总位移不仅包括滑动面内土体的位移,还包括坑后由于降水引起的位移。在降水作用下,引起支护结构的水平位移比竖向位移大,且引起的竖向位移能有效地减小基坑底面的隆起量。并且土质状况对支护结构体系位移的影响也很大。
According to the basic rules of groundwater seepage and the constitutive model of soil stress, a finite element model coupled with seepage field and stress field is established for the second phase of Liangzhi Carnival Project. The numerical simulation is carried out by PLAXIS finite element software. Considering the effect of precipitation and the effect of groundwater, the displacement of the flexible retaining structure of composite soil nailing is discussed. In order to ensure the accuracy of the analysis, the model uses 15-node triangular elements. The analysis results show that when considering the effect of precipitation , The total displacement of the foundation pit includes not only the displacement of the soil body in the sliding surface but also the displacement due to the precipitation after the pit. Under the action of precipitation, the horizontal displacement of supporting structure is larger than vertical displacement, and the vertical displacement caused by it can effectively reduce the uplift of the foundation pit. And the influence of soil condition on the displacement of supporting structure system is also great.