温度和有效应力对砂岩渗透性影响的试验研究

Testing study concerning the effect of temperature and effective stress on permeability of sandstone

为探讨温度和有效应力对渗透性的影响 ,在不同温度水平和不同有效应力水平下进行了砂岩的渗透率试验。根据试验结果 ,初步分析了温度和有效应力对砂岩渗透率及其水力传导系数的影响。试验结果表明 ,砂岩的渗透率及其水力传导系数都是温度和有效应力的函数 :在温度一定的条件下 ,砂岩的渗透率和水力传导系数均随有效应力的增加而呈负指数规律减小 ;在有效应力一定的条件下 ,砂岩的渗透率随温度的升高而减小 ,但水力传导系数与温度之间的关系函数并非单调函数。因此 ,在工程实践中不考虑温度和有效应力对岩石 (体 )

In order to study the effect of temperature and effective stress on permeability, the permeability tests for sandstone are conducted at various temperature level and various effective pressure level. Based on the test results, the effect of temperature and effective stress on intrinsic permeability and hydraulic conductivity of sandstone are preliminarily analyzed. The testing results show that both the intrinsic permeability and hydraulic conductivity of sandstone are the function of temperature and effective stress. At the fixed temperature level, both the intrinsic permeability and hydraulic conductivity of sandstone decrease with the increasing effective stress, following the law of negative exponent. At the fixed effective pressure level, the intrinsic permeability of sandstone decreases with the increasing temperature, but the function between hydraulic conductivity and temperature is not a monotone function. So, it is improper to take no account of the effect of temperature and effective stress on rock′s permeability in the engineering practice.