基于弹性地基梁法的地下管线简化模型分析

Simplified model analyses for underground pipeline base on elastic foundation beam method

考虑到有限元等数值分析方法需要建立大量的实体单元,在进行结构分析时存在计算工作量大、耗时较长、计算效率低和建模困难等问题。采用弹性地基梁法,建立了地基与管线结构简化计算模型,对管线下方地基开挖时管线尺寸、开挖步长因素的影响机制问题进行了参数分析。结果表明,地下管线结构变形最大位置分布在开挖工作面处,随距离工作面距离增加变形值逐渐减小并趋于稳定;结构挠曲变形随管径增加而减小、随开挖进尺增加而增大。

The finite element method and other numerical analysis methods need to establish a large number of solid elements. There are many problems in structural analysis,such as large calculation workload,long time-consuming,low calculation efficiency and difficulty in modeling. By using elastic foundation beam method,the simplified calculation model of foundation and pipeline structure is established,which can be used to analyze the pipeline size and excavation step when the foundation under the pipeline is excavated. The results show that the maximum deformation position of underground pipeline structure is located at the excavation face,and the deformation value decreases and tends to be stable with the distance from the working face increasing,while the structural deflection decreases with the increase of pipe diameter and increases with the increase of excavation footage.