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以某砖混结构居民楼为研究对象,把基础和上部结构看作一个有机的整体,按照建筑物-土体-隧道共同作用进行分析。采用ANSYS软件建立了三维有限元模型,研究计算了盾构隧道施工对地层沉降以及建筑物的沉降、水平变形和应力等的影响。分析表明,建筑物的存在改变了隧道周围土体位移场的分布;建筑物纵向中轴线的沉降曲线基本符合正态分布;其不同楼层的水平变形特征差异较大,纵向中轴线的Z向位移曲线和X向位移曲线都不具有对称性;隧道通过后,建筑物的最大主拉应力尚未超过砌体的抗拉强度平均值,可不采取措施减小其附加变形与应力。
Taking a brick-concrete residential building as the research object, the foundation and the superstructure are taken as an organic whole, and analyzed according to the common function of the building-soil-tunnel. The three-dimensional finite element model was established by ANSYS software. The influence of shield tunneling on settlement and settlement, horizontal deformation and stress of the building was studied. The analysis shows that the presence of buildings changes the distribution of soil displacement field around the tunnel. The settlement curve of the longitudinal central axis of the building basically meets the normal distribution. The horizontal deformation features of different floors are quite different. The longitudinal displacement of the longitudinal axis Both the curve and the X-direction displacement curve have no symmetry. After the tunnel passes, the maximum principal tensile stress of the building has not exceeded the average value of the tensile strength of the masonry, and no measures can be taken to reduce its additional deformation and stress.