摘要
渗透性测试试验一般采用直接测渗流量的方法,难以对低渗透岩有效测定流量。利用新开发的高压渗透仪,采用"体变量法"进行渗透性测试,该法是通过精确计量渗透出水端水体积的变化量(最小有效测试精度可达0.03mL)度量岩石(体)渗流量的大小。保持渗透水压差不变,当出水端水体积变化与时间呈线性关系时,即该时段渗透速度保持不变,则该时段试样渗透特性符合达西定律,可利用达西公式对试样渗透性指标进行分析计算。采用这种方式,即使是针对超低渗透性岩石(渗透系数小于10-9cm/s),在整个渗透端面形成以后,某一条件下渗透性测试仅需十几分钟甚至几分钟,大大缩短了测试时间,提高了测试精度。试验证明该方法是一种有效的测试方法。
It is usually directly to test seepage quantity in the laboratory, which is difficult to accurately measure for low permeability rocks. In this paper, the volume change method has been used with the new equipment called high pressure permeability testing apparatus in lab. This method can exactly measure the seepage water volume change quantity （the least effective test precision is 0.03ml）. When the seepage water pressure difference is unchangeable, the stable penetration flow phase can be ascertained according to the linear relationship between seepage water volume change quantity and time, which can be considered satisfying the Darcy＇s law; and the Darcy＇s formula can be used. Using this method, even the ultra-low permeability rocks, whose permeability coefficient less than 10^-9 cm/s, when the whole seepage section was formed, the test time was just more than ten minutes or several minutes. This method can save the test time greatly and improve the precision. Test results demonstrate it is an effective permeability test method.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2009年第10期2961-2964,共4页
Rock and Soil Mechanics
基金
国家自然科学基金雅砻江水电开发联合研究基金重点资助项目(No.50539050)
关键词
渗透系数
体变量法
渗流量
磁致伸缩性位移传感器
渗透速度
permeability coefficient
volume change quantity method
seepage quantity
magnetostrictive displacement sensor
infiltration velocity
