填埋体热调节理论与温度变化时HDPE管道应力变形特性研究

There is obvious negative influences on the municipal solid waste (MSW) landfills by temperature increase from biodegradation. In this proposal, the influences will be avoided by the temperature regulation and thermal energy utilization measurements. A new heat transfer theory will be established on field and laboratory experiments considering heat generation and volume change of biodegradation. The new heat transfer theory will be solved on identifiable initial conditions and boundary conditions corresponding to field and laboratory experiments. The analytical and numerical solutions will be obtained. The mechanism of heat regulation and temperature change in landfills will be investigated through sensitivity analysis of influencing factors and verification of test results. The performance of the HDPE pipes in landfills will be investigated by improved test equipment. The maximum vertical and lateral displacement of HDPE pipes under load and temperature can be measured. The calculation theory of deformation and stress of HDPE pipes from load and temperature will be built concerning different interfaces between HDPE pipes and protection materials. The change of deformation and stress of HDPE pipes considering the influences of load, temperature will be studied. A failure criterion of HDPE pipes on deformation and stress will be established.

城市生活垃圾填埋场中有机成分降解将引起温度升高，对填埋场运行会产生不利影响，可以采取调节措施进行填埋场内温度调节和热能利用，改变填埋场运行状况。申请项目将在已经开展的现场和室内试验研究基础上，考虑填埋场有机物降解产热和体积变化，引入有机物降解产热源项，建立考虑降解产热和体积变化的新热传导理论；补充现场试验和室内试验对应的初始和边界条件，推求新分析理论的解析解和数值解，通过影响因素敏感性对比研究热调节机理，调查填埋场热调节和温度变化规律；考虑荷载和温度共同作用，在现有试验设备上增加HDPE管道试验功能，进行管道在荷载和温度共同作用下受力变形规律试验研究，发现管道的最大竖向和侧向位移以及管壁应力随荷载和温度变化的规律，揭示HDPE管道的变形和应力变化机理；考虑管道和周围材料不同界面接触状态，建立管道受力变形和应力变化计算分析理论，研究荷载和温度影响管道变形和应力变化规律，建立管道破坏判别准则。

城市生活垃圾填埋场中有机成分降解将引起温度升高，对填埋场运行会产生不利影响，可以采取调节措施进行填埋场内温度调节和热能利用，改变填埋场运行状况。本项目在已经开展的室内试验研究基础上，考虑填埋场有机物降解产热，引入有机物降解产热源项，建立了考虑降解产热的轴对称热传导理论；补充室内试验对应的初始和边界条件，得到了理论的解析解；研制了具有温控功能的HDPE管加载试验箱，进行了管道在荷载和温度共同作用下受力变形规律试验研究，调查了先加载后升温时埋地HDPE管的竖向和横向变形规律，以及HDPE管周环向应变的变化规律；考虑管土完全接触和光滑接触条件，建立了管道受力变形和应力变化计算分析理论，分析了荷载、温度和径厚比变化时HDPE管应力变形的变化规律。