基于正交试验法的埋地钢管参数敏感性分析

Sensitivity Analysis for Parameters of Buried Steel Pipes Based on Orthogonal Test Method

埋地钢管在设计时需考虑管周土体和沟槽对钢管的影响,但土体力学参数和沟槽形态参数对钢管结构的影响研究不够深入。通过引入正交试验法,以钢管最大竖向变形和钢管顶、腰、底处环向弯曲应力为试验指标,进行回填土变形模量E_(1)、砂垫层变形模量E_(2)、垫层包角θ、沟槽底部开挖宽度B和沟槽侧壁倾角α关于试验指标的敏感性分析。研究表明:对钢管变形和应力敏感性较高的因素有E_(1)、E_(2)、α;B的敏感性较低;θ的敏感性最低。埋地钢管的土体变形模量高、沟槽窄对钢管结构有利,沟槽侧壁倾角影响较为复杂,需结合具体工程进行分析。研究成果可为合理选取埋地钢管的结构设计参数,提供一定的参考依据,同时也为类似问题提供一种分析思路。

In the design of buried steel pipes,the influences of surrounding soil and trench on the steel pipes need to be taken into consideration,which are researched inadequately.The sensitivities of such parameters inclusive of the deformation modulus E_(1) of backfill,the deformation modulus E_(2) of sand bedding,the bedding angleθ,the trench bottom width B,and the inclination angleαof trench sidewalls to test indices(maximum vertical deformation of pipe,circumferential bending stresses of pipe top,springline,and bottom)were examined via an orthogonal test method.Results suggest that E_(1),E_(2),andαare highly sensitive to the test indices,while B bears low sensitivity to the test indices,andθhas the lowest sensitivity.The high soil deformation modulus and narrow excavation trench are beneficial to the structure of buried steel pipes,while the inclination angle of trench sidewalls has a complex influence on pipes and needs to be analyzed in line with specific situation.The research findings provide references for the parameter design of buried steel pipes.