煤炭工程 ›› 2021, Vol. 53 ›› Issue (5): 156-161.doi: 10.11799/ce202105029

• 研究探讨 • 上一篇    下一篇

基于裂隙几何特征的岩体渗透率预测

郭忠华   

  1. 吕梁学院矿业工程系
  • 收稿日期:2021-01-06 修回日期:2021-03-16 出版日期:2021-05-20 发布日期:2021-05-17
  • 通讯作者: 郭忠华 E-mail:guozh20@126.com

The influence and prediction of fracture geometry on rock mass permeability

  • Received:2021-01-06 Revised:2021-03-16 Online:2021-05-20 Published:2021-05-17

摘要: 为了研究基于地表裂隙特征的三维岩体等效渗透率预测方法,建立了不同裂隙特征下三维裂隙岩体几何模型,分析了裂隙几何特征、基质渗透率与二维切面等效渗透率与岩体等效渗透率的内在联系,发现二维切面等效渗透率整体小于三维岩体等效渗透率,且三维岩体等效渗透率与裂隙长度、密度、基质渗透率呈线性关系。量化了裂隙几何参数及基质渗透系数对三维模型等效渗透率的影响,并通过回归分析建立了基于三维岩体裂隙长度、密度、基质渗透率与二维切面等效渗透率预测三维等效渗透率表达式,预测效果较好。

关键词: 裂隙岩体, 裂隙几何特征, 预测模型, 二维切面, 渗透率

Abstract: The equivalent permeability of the 3D fractured porous media is predicted based on fracture geometrical parameters of 3D model, the matrix permeability and permeability of 2D cut plane. 3D models of fractured porous media with different fracture characteristics were established, and the equivalent permeability of 2D/3D model were calculated. The results show that the equivalent permeability of the 2D cut plane is much smaller than the 3D equivalent permeability. The effects of fracture geometric parameters and matrix permeability coefficients on the equivalent permeability of the 3D model were quantified. Through regression analysis, a 3D equivalent permeability prediction expression based on 3D rock mass fracture length, density, matrix permeability and 2D equivalent permeability is obtained. This study provides the possibility to use the surface matrix-fracture characteristics to predict the permeability of 3D fractured porous media.

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