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运用有限元数值计算软件,PLAXIS,结合武汉某办公楼深基坑工程实例,模拟了基坑的分步施工过程,最终计算结果与现场监测值吻合良好,从而证明该计算方法可行。在此基础上,讨论并分析了桩-土接触界面强度折减因子和接触单元的虚拟厚度因子对支护结构水平位移、地表沉降以及基坑底部隆起的影响规律。研究表明:随着强度折减因子的增大,墙体变形会逐渐减小;而随着虚拟厚度因子的增大,墙体变形却逐渐增大。通过对比发现:强度折减因子和虚拟厚度因子对支护结构的位移的影响最大,对基坑底部隆起变形的影响最小;相对而言,强度折减因子比虚拟厚度因子对基坑位移的影响更明显。
The finite element numerical calculation software and PLAXIS are used to simulate the step-by-step construction process of a foundation pit with the example of a deep foundation pit project in an office building in Wuhan. The final calculation result is in good agreement with the on-site monitoring data, which proves that the calculation method is feasible. On this basis, the influence of the strength reduction factor of the pile-soil contact interface and the virtual thickness factor of the contact element on the horizontal displacement of the support structure, the settlement of the ground surface and the uplift of the bottom of the foundation pit are discussed and analyzed. The results show that the deformation of the wall decreases with the increase of the strength reduction factor, while the deformation of the wall increases with the increase of the virtual thickness factor. The results show that the strength reduction factor and the virtual thickness factor have the most significant influence on the displacement of the support structure, and have the least influence on the deformation of the bottom of the foundation pit. In contrast, the effect of the strength reduction factor on the displacement of the foundation pit is greater than that of the virtual thickness factor More obvious.