基于ALA土壤模型的埋地管道应力分析

Stress Analysis of Buried Pipeline Based on Ala Soil Modeling

在埋地管道的应力分析中,需要考虑管道结构、土壤结构、管道和土壤的相互作用。对于压力管道而言,内压下的应力分布、管道环向刚度和环向偏转是管道结构分析的基础;土壤的有效密度、内摩擦角、黏聚力和竖向土壤的压缩是主要土壤性质;ALA土壤模型采用离散非线性弹簧模拟管道周围的土壤载荷,采用轴向、水平、上方、下方四个弹簧模拟管道与土壤之间的相互作用。结合应力分析软件CAESARⅡ的管道设计计算方法,可以为埋地管道设计和优化提供依据,有利于提高对埋地管道应力安全问题的认识。

In the stress analysis of buried pipelines,it is necessary to consider the pipeline structure,soil structure,and the interaction between pipeline and soil.For pressure pipelines,stress distribution under internal pressure,circumferential stiffness and circumferential deflection of the pipeline are the basis of pipeline structure analysis.Effective density,angle of internal friction,cohesion and vertical soil compression of soil are the main soil properties;ALA soil model adopts discrete nonlinear springs to simulate the soil load around the pipeline,and the axial,horizontal,upper and lower springs are used to simulate the pipeline-soil interaction.Based on the pipeline design calculation method on the stress analysis software CAESARⅡ,it can provide a basis for the design and optimization of buried pipelines,which is conducive to improving the understanding of the stress safety problems around buried pipelines.