A comment upon gazdar ' s theory of contextual transform 水坝泄水管涵工程对顶施工技术
2.
Application of pipe thrusting method in the maintenance of highways 圆管涵顶推法施工在公路养护中的应用
3.
( 2 ) respectively by elastic theory analyses and methods of structural mechanics , transverse static analytical equations for flexible pipeline rigid pipeline are established whose outcomes are applied in numerical example to compare those with that by finite element method . ( 3 ) considering interaction of filled soil , pipeline and foundation , with an eye to non - linear soil model , in view of the initial geo - stress field and the effects of interface between soil and pipeline , and by finite element method the calculational model and method are built for transverse stress in pipeline . then , by the great finite element analytical software ansys , those outcomes are applied in calculation example of positive buried pipe to educe the distribution of circumjacent soil pressure and stresses on cross section and to compare it with that calculated by conventional ways before those outcomes are applied in engineering case of positive buried pipe with flexible filled materials to confirm distribution of soil pressures after the measure for reduction and to compare it with measurements . as a result , the model set up in this paper is proved to be applicable after all above - mentioned analyses 本文基于弹性理论和有限元原理与方法，分析了上埋式地下管道横向力学计算方法和性状并探讨了上埋式地下管道的减荷等问题： ( 1 )在分析现有几种典型的管道垂直土压力计算方法的基础上，探讨了影响垂直土压力的主要因素以及改进的方法； ( 2 )分别通过弹性理论分析法和结构力学的方法，建立了地下管道柔性圆环和刚性管涵的横向静力计算方程，并应用在算例中，把所得结果和有限元方法所得结果进行对比分析； ( 3 )考虑填土、管道和基础的共同作用、土体的非线性特性、初始应力场以及土体和管道的接触面因素的影响，利用有限元的思路，建立了地下管道横向力学有限元计算模型和方法，并且采用大型有限元分析软件ansys ，针对上埋式管道工程算例，得出了管周土压力以及管道横截面应力的分布状况和规律，并和理论值进行对比；针对施加柔性填料的上埋式管道工程实例，得出了减荷后的土压力分布，并和实测值进行了对比。
