岩土力学 ›› 2020, Vol. 41 ›› Issue (11): 3523-3530.doi: 10.16285/j.rsm.2020.0250

• 基础理论与实验研究 • 上一篇    下一篇

基于圆盘裂隙物理模型的岩体单一 裂隙渗流规律试验研究

王明玉1,刘庆哲1,曲辞晓1,李金柱2   

  1. 1. 中国科学院大学 资源与环境学院,北京 101408;2. 辽宁工程技术大学 矿业学院,辽宁 阜新 123000
  • 收稿日期:2020-01-09 修回日期:2020-04-13 出版日期:2020-11-11 发布日期:2020-12-24
  • 作者简介:王明玉,男,1961年生,博士,教授,博士生导师,主要从事裂隙水动力学及地下水环境方面的研究。
  • 基金资助:
    国家自然科学基金(No. 41572240);国家重点研发计划(No. 2019YFC1806205)。

Experimental investigation on the seepage flow through a single fracture in rocks based on the disc fracture model

WANG Ming-yu1, LIU Qing-zhe 1, QU Ci-xiao1, LI Jin-zhu2   

  1. 1. College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, China; 2. College of Mining, Liaoning Technical University, Fuxin, Liaoning 123000, China
  • Received:2020-01-09 Revised:2020-04-13 Online:2020-11-11 Published:2020-12-24
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (41572240) and the National Key Research and Development Program (2019YFC1806205).

摘要: 岩体中裂隙平行板渗流模型被广泛地应用于实际岩体裂隙渗流过程与特征的定量描述与刻画,但实际岩体裂隙渗流的空间域与平行板假设可能相差甚远。因此,裂隙平行板渗流模型应用于实际裂隙渗流条件下的模型有效性及适宜的修正表达方法成为关注点。选取更接近实际裂隙空间分布的圆盘形状,在室内构建单圆盘裂隙物理模型。通过改变圆盘裂隙的隙宽和裂隙相交产生的水流进出口交线长度,进行不同压力梯度下的渗流试验,探讨不同岩体隙宽和交线长度下的裂隙水渗流规律。试验结果表明,针对不同雷诺数下的非达西流态,达西定律模型在一定程度仍能较好地刻画岩体裂隙渗流量和压力梯度的统计关系,但Forchheimer模型精准度更高。值得注意的是,Forchheimer模型中参数A与B的计算式需要修正。提出了修正方法,并依据试验数据获得了具有一定应用范围的A与B相应修正计算式。研究成果可望为岩体中单一裂隙及复杂裂隙网络渗流研究与工程应用提供一定理论基础与方法借鉴。

关键词: 岩体裂隙渗流, 圆盘裂隙模型, 渗流试验, 渗流规律, 模型修正

Abstract: The fracture parallel plate seepage model has been widely applied to describe the processes and characteristics of fluid flow through fractures in rocks, while the actual flow field of the fracture seepage in rocks could be far more complicated than the assumption of rock matrix to be parallel plates. As a result, it draws lots of attentions on investigations on suitability and corrections of the fracture parallel plate seepage model. In this study, by taking the disc fracture model which is closer to the actual fracture shape than the parallel plate model, a physical model of a single disc fracture was constructed in the laboratory. By changing the aperture of the disc fracture in rocks and the sizes of the water inlets and outlets, the seepage experiments under different pressure gradients were conducted to investigate the laws of fluid flow in fractures. The experiment results show that the Forchheimer model fitted the relationship between the seepage flow and pressure gradient inside the disc fracture relatively well while the Darcy law model presents also a good fitting for the Non-Darcy flow regimes. It should be noticed that the calculation formulas of the parameters A and B in the Forchheimer model need to be modified as to the Forchheimer model. Furthermore, an approach has been recommended for those modifications and the corresponding modified calculation formulas with certain reliability have been given based on the experimental results. This study is expected to provide in certain degree theoretical foundations and methods for further investigation of fluid flow through a single fracture in rocks and the complex fracture networks.

Key words: seepage through fractures in rocks, disc fracture model, seepage flow experiment, seepage flow law, model modifications

中图分类号: 

  • P 641.2
[1] 熊 峰,孙 昊,姜清辉,叶祖洋,薛道锐,刘乳燕,. 粗糙岩石裂隙低速非线性渗流模型及试验验证[J]. , 2018, 39(9): 3294-3302.
[2] 田坤云 ,张瑞林,. 高压水及负压加载状态下三轴应力渗流试验装置的研制[J]. , 2014, 35(11): 3338-3344.
[3] 郑荣跃,梧 松. 基于Spencer法的边坡稳定性可靠度指标分析[J]. , 2006, 27(1): 147-150.
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