西安地铁某区间隧道设计计算方法比较

Comparing on Different Calculation Methods of Tunnel Design at one Interval in Xi'an Metro

通过运用解析法、一维、二维、三维数值模型对西安地铁某区间段盾构管片结构进行了位移、内力计算,旨在研究不同计算方法对同一问题结果的影响规律.其中,以日本惯用法为理论基础对该区间管片进行解析法求解;并用ANSYS有限元软件对管片进行了三种不同形式的数值模拟.通过比较发现,四种方法对管片的位移和内力计算结果云图显示趋势基本一致.ANSYS三维模型的位移沉降值最大;二维模型的内力计算结果最大.因此,在控制沉降分析中应以三维模型计算结果为主,在配筋计算等设计环节应以二维模型计算结果为主.最后本文总结了各种算法的适用范围,得出的相关结论对盾构隧道设计给与了一定的指导意见.

Analytical method,one,two and three dimensional model are used to calculate the displacement and the internal force of the segments from one interval in Xi＇an Metro to compare the results by different calculation methods.The Japanese general method is taken as one of the analytical method,and finite element software ANSYS is used for the numerical simulation in three different ways.By comparison,the displacement nephogram and the internal force nephogram of the four methods have the same variation tendency.The maximum value of the settlement comes from the three dimensional ANSYS model,and the maximum value of the internal force comes from the two dimensional ANSYS model,which means the three dimensional model is better in displacement calculation,and so does the two dimensional model in internal force calculation.The scope of application of the four models is summarized,providing some guidance for the design of the subway tunnel.