温度和含水率对砂岩导热特性影响实验研究

发布时间：2018-04-05 13:51

  本文选题：岩石力学　切入点：砂岩　出处：《岩石力学与工程学报》2017年S2期

【摘要】：岩石的热导率是开展岩土工程的关键参数之一,其除了受到岩石孔隙特性等岩石本身特性影响外,还与温度等岩石所处环境密切相关。针对温度和含水率对岩石导热特性的影响,通过自主设计的温湿耦合导热特性实验系统,开展不同温度和含水率下砂岩导热特性实验研究。研究结果表明:首先,在-80℃~90℃温度区间内砂岩的导热系数与温度呈反比关系,变化幅度随岩性不同,其中粗砂岩最大,细砂岩次之,粉砂岩最小;其次,在相同温度下砂岩的导热系数随含水率增加而增大,且其增长速率随温度的升高而降低;最后,饱和状态下砂岩导热系数随温度升高而下降,且在0℃附近有显著的跳跃,通过理论模型分析揭示岩石孔隙水相变是跳跃的主要因素。
[Abstract]:The thermal conductivity of rock is one of the key parameters in geotechnical engineering. It is not only affected by the rock characteristics such as pore characteristics of rock, but also closely related to the environment of rock such as temperature.In view of the influence of temperature and moisture content on the thermal conductivity of rock, the thermal conductivity of sandstone under different temperature and water content is studied by the self-designed experimental system of thermal-moisture coupled thermal conductivity.The results show that: firstly, the thermal conductivity of sandstone is inversely proportional to the temperature in the temperature range of -80 鈩，

本文编号：1715043