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利用基于有限元原理的设计计算软件Plaxis对青岛三星数码大厦基坑工程进行数值模拟计算,其地表水平位移的计算结果与实测数值吻合较好。并通过对模拟得到的基坑与支护结构的变形结果如基坑总位移、灌注桩水平位移和基坑周边地表沉降以及支护结构的内力分布情况如灌注桩剪力、轴力、弯矩和锚杆内力进行分析发现预应力锚杆能够明显地改变土体中的应力分布,对基坑变形有很好的约束作用。说明在土岩二元结构地层条件下,支护结构的变形主要产生于岩面以上,采用桩锚支护结构是可行的,用Plaxis进行基坑模拟可以用来作为深基坑设计、施工的辅助工具。
Based on the finite element calculation software Plaxis, the numerical simulation of the foundation pit construction of Qingdao Samsung Digital Building is carried out. The calculation results of the horizontal displacement of the ground surface agree well with the measured values. The deformation of foundation pit and supporting structure such as the total displacement of foundation pit, the horizontal displacement of cast-in-place pile, the settlement of ground surface around foundation pit and the internal force distribution of supporting structure such as the shear force, axial force and bending moment And the analysis of the internal force of the anchor rod, it is found that the prestressed anchor rod can obviously change the stress distribution in the soil and has a good restraint effect on the deformation of the foundation pit. It shows that under the condition of binary structure strata of earth and rock, the deformation of the supporting structure mainly occurs above the rock face. It is feasible to adopt the pile-anchor supporting structure. The simulation of the foundation pit with Plaxis can be used as the design and construction of the deep foundation pit Auxiliary tools.