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本文研究隧道开挖对地下管线的影响,提出基于管线三维壳体仿真模拟的管线变形预测方法。考虑管线真实的薄壁结构,利用FLAC3D有限差分程序作三维壳体结构仿真模拟,把已知的土体变形以位移加载方式作用于管线,计算结果即为管线变形状态。通过该预测方法与梁结构弹性连续解法的对比计算,论述了壳体模拟用于低刚度管线的准确性,也验证了梁结构用于高刚度管线的可行性。实际工程中,按照实际管线的材质、几何尺寸和土体参数建模,把地表沉降实测数据作为已知量输入,即可预测管线受力变形情况。
In this paper, the influence of tunnel excavation on underground pipeline is studied, and the pipeline deformation prediction method based on three-dimensional simulation of pipeline hull is proposed. Considering the real thin-walled structure of the pipeline, the FLAC3D finite difference program is used to simulate the three-dimensional shell structure simulation, and the known soil deformation is applied to the pipeline by the displacement loading method. The calculation result is the pipeline deformation state. Through the comparison and calculation between this prediction method and the elastic continuous solution of the beam structure, the accuracy of the shell simulation for the low stiffness pipeline is discussed, and the feasibility of the beam structure for the high rigidity pipeline is also verified. In practical engineering, according to the actual pipeline material, geometry and soil parameters modeling, the measured data of surface subsidence as a known input, you can predict the pipeline deformation.