摘要
目前对顶管施工中钢管的稳定性及管材壁厚的合理选择问题研究的较少。以某发电厂的引水钢管设计施工为工程背景,根据地质勘察资料和施工步骤,运用有限元软件建立了顶管施工的三维数值模型。通过数值模拟可以得到不同壁厚的钢管在施工过程中的内力与变形,但无法直接对壁厚进行优化选择。引入相关规范中的计算方法,可以得到不同壁厚下钢管维持稳定的临界压力。将临界压力同数值计算得到的钢管受力情况进行比较,可以得到合理壁厚的数值。通过对不同壁厚、不同管侧土模量下的分析计算,本工程引水钢管的壁厚可由初始设计的34 mm减小至22 mm。
Few studies are focused on the stability of steel pipe during pipe jacking construction and the choice of proper pipe wall thickness.The pipe-jacking of intake pipe design of a heat-engine plant is studied as a project case,and the 3D numerical model is created to simulate the construction phases,based on the geology survey result and field experiment.Through numerical simulation the internal force and deformation of steel pipe can be obtained,but the control standard of wall thickness can not be got directly.The method in related code is leading to compute the critical pressure to maintain stability of steel pipe under its different wall thickness.Comparing the critical pressure with the actual force of steel pipe,the proper wall thickness can be determined.Through computation of different pipe wall thickness and different modulus of soil around the pipe,the wall thickness of steel pipe in the project studied can be reduced from original design thickness 34 mm to 22 mm.
出处
《地下空间与工程学报》
CSCD
北大核心
2013年第1期161-165,172,共6页
Chinese Journal of Underground Space and Engineering
基金
住房和城乡建设部科学技术项目(2011-K3-33)
关键词
顶管施工
数值模拟
稳定分析
壁厚
优化
pipe jacking
numerical simulation
stability analysis
wall thickness
optimization
