低温下孔隙水和孔隙结构对饱水岩石导热性的影响  

Effect of Pore Water and Pore Structure on Thermal Conductivity of Saturated Rock at Low Temperature

作　　者：朱董珠 ZHU Dongzhu(Shaanxi Railway Engineering Survey Co.,Ltd.,Xi’an 710043,China)

机构地区：[1]陕西铁道工程勘察有限公司,西安710043

出　　处：《粉煤灰综合利用》2025年第1期94-97,118,共5页Fly Ash Comprehensive Utilization

摘　　要：为探索孔隙尺寸、孔隙结构对冻结过程中饱和岩石热扩散率的影响。采用任意加热法测量了细砂岩、粗砂岩、凝灰岩和花岗岩的热扩散系数。总结不同含水状态与温度下,岩体热扩散系数的变化规律和相关性。分析了孔隙度和孔隙结构对饱和岩石在冻结过程中的热扩散率的影响。结果表明,饱和岩石冷却过程中热扩散系数的变化主要取决于孔隙结构与孔径分布,而不是岩石含水量与孔隙率。含有大孔隙的岩石,如粗砂岩,在饱和含水状态下具有明显的温度敏感性。因此,可以通过测量岩体的孔径分布和热物性特征来估计冷却过程中热扩散率的变化行为。To explore the effect of pore size and structure on thermal diffusivity of saturated rock during freezing.The thermal diffusion coefficients of fine sandstone,coarse sandstone,tuff and granite were measured by arbitrary heating method.The variation law and correlation of thermal diffusivity of rock mass under different water state and temperature are summarized.The effect of porosity and pore structure on thermal diffusivity of saturated rock during freezing is analyzed.The results show that the variation of thermal diffusivity in the cooling process of saturated rock is mainly determined by pore structure and pore size distribution,rather than rock water content and porosity.Rocks with large pores,such as coarse sandstone,have obvious temperature sensitivity at saturated water.Therefore,the variation behavior of thermal diffusivity during cooling can be estimated by measuring the pore size distribution and thermal properties of rock mass.

关 键 词：岩石 温度 热扩散系数 孔隙率 孔隙结构 

分 类 号：TU454[建筑科学—岩土工程]