【摘要】 一般情况下,随着尺寸的增大,裂隙岩体的性质参数也会发生变化,当尺寸增大到某一临界状态时,该参数会保持不变,这一临界尺寸称为裂隙岩体表征单元体(REV)。依托国家某地下水封石洞油库项目,基于辐射流的REV尺寸确定方法,研究了该库址区的渗透性REV尺寸及渗透系数,得到了该库址区辐射流情况的REV尺寸为37.5 m,是迹长的1.3倍;研究了迹长、间距、岩桥长度对REV尺寸及渗透系数的影响,得到了迹长、间距对REV尺寸和渗透系数有一定的影响,而岩桥长度对REV尺寸的影响不明显;对比分析了平行流和辐射流情况下REV尺寸与渗透系数的异同,得到了采用辐射流得到的REV尺寸和渗透系数更加符合实际,并且计算较为方便。更多还原

【Abstract】 In general, the properties and parameters of fractured rock mass are changed with the increase of rock mass size. But when the size increases to a critical state, the properties and parameters of fractured rock mass remain unchanged. The critical size is called the representative elementary volume(REV) of fractured rock mass. In this paper, based on an underground oil project in China and the method to determine REV size in radial flow configuration, the REV size for permeability and the permeability coefficient of fractured rock mass in the area of underground oil depot cavern are investigated, and the REV size is 37.5 m for radial flow configuration, which is 1.3 times of the trace length. The influences of trace length, spacing and gap length on the REV size and permeability coefficient are investigated as well. The REV size and permeability coefficient are influenced by the trace length and spacing, and the REV size is not influenced by the gap length. REV sizes and permeability coefficients under the conditions of radial and unidirectional flow configurations are calculated, and the REV size and permeability coefficient obtained in radial flow configuration are closer to the actual project and the calculation method is more convenient.更多还原