摘要
垃圾填埋场的渗滤液收集和导排系统中大量使用HDPE和PVC管道,其凹瘪破坏时有发生,而有关填埋场中管道受力变形的研究很少。假定其为平面应变问题,考虑管道实际工况、管土相互作用的条件,采用弹性力学理论建立模型,对管道的应力变形进行求解,得到管道任意一点处应力和位移的解析表达式,并与已有模型计算得到的解析解进行比较,以验证本文方法的合理性。计算及分析结果表明:(1)在管土接触面上,不管是光滑接触还是完全接触,管道受到的都是压应力,随着θ角度的增大径向正应力和环向正应力也逐渐增大,最大正应力出现在管道顶点位置;(2)在θ为0°~30°时管道产生拉伸变形,θ为30°~90°时管道产生压缩变形,位移变化最大点在管道顶端。此计算理论可用于进行管道尺寸设计与选择的指导。
HDPE and PVC pipes are widely used in the leachate collection system of municipal solid waste landfills, which may sunken and collapse some time,but study about stress and deflection of pipes in landfills can seldom be found. Therefore,a theoretical equation of pipe stress and displacement at any point to calculate stress and displacement was built under the premise of assuming this problem a situation of plane strain,with consideration of the actual working conditions of landfill pipes and the soil-pipe interaction problem,and on the basis of elastic models and theories. Besides,comparison between this solution and other closed solutions was carried out,to indi-cate the solution of this paper is reliable. The results show as the following： a. On the contact interface of pipes and soil,pipe stresses are compression no matter with no slippage or full slippage on the interface. Radial stress and hoop stress increase with the increasing of angle θ,the biggest stress of which can be found at the crown, b. The pipe diameter increases when θ is in the range of 0° to 30°and the pipe diameter decreases when 0 is in the range of 30° to 90°. The maximum of deflection is at the crown of pipe. The theory of this arti-cle can be used to conduct choosing and designing the right leachate collection pipes.
作者
方蔚雯
施建勇
Fang Weiwen Shi Jianyong(Key Laboratory of Geomechanics and Embankment Engineering,Ministry of Education ,Hohai Universisty, Nanjing 210098 , China)
出处
《能源与环保》
2017年第5期29-34,共6页
CHINA ENERGY AND ENVIRONMENTAL PROTECTION
基金
国家自然科学基金(41510637)
