基于CT的黄土孔隙尺度优先流特性
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P163

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国家自然科学基金青年基金(41907235)


Research on pore scale preferential flow characteristics of loess based on CT
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    摘要:

    摘要:CT扫描技术正被广泛应用于岩土多孔介质中孔隙的定量化表征,然而以往关于黄土孔隙定量化的相关研究存在CT扫描的分辨率不足问题,无法精准的识别出黄土中的全部大孔隙。基于高精度的微米CT,以陕西延安Q2黄土为例,在提取的黄土中真实孔隙结构的基础上,借助概化的孔隙网络模型研究了黄土的孔隙、孔喉和孔喉配位数分布特征,发现三者均呈对数正态分布;通过简化的Navier-Stokes方程及孔隙网络模型定量化地研究了在给定边界压差下管状通道、裂隙形成的优势通道中压力及流速的分布,与不含优势通道的代表性体积单元进行对比,发现裂隙对整体渗流特性的影响为均匀促进型,而管状通道为渗流集中型;在求得渗透系数后与原状黄土及重塑黄土的室内渗透实验结果进行对比验证了计算模型的可靠性。

    Abstract:

    Abstract:Computed tomography(CT)technology is widely used in the quantitative characterization of pores in geotechnical porous media. However, the previous research on the quantification of loess pores has the problem of insufficient resolution of CT scanning, which can not accurately identify all macropores in loess. Based on the high-resolutionmicro-CT, taking Yan'an loess as the research object, the real pore structure in loess was extracted to studies the distribution characteristics of pore and throat of loess with the help of generalized pore network model and it is found that they fit the logarithmic normal distribution model.Based on the simplified Navier-Stokes equation and pore network model, the distribution of pressure and velocity in the preferential channel formed by pipes and fractures under a given boundary pressure difference is quantitatively studied. Compared with the representative volume element without preferential channel, it is found that the influence of fracture on the overall permeability characteristics is uniform promotion type, while the pipe is seepage concentration type;After obtaining the permeability coefficient, it is compared with the laboratory permeability test results of undisturbed loess and remolded loess to verify reliability of the calculation model.

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宁瑞浩,冷艳秋,何芝远,等. 基于CT的黄土孔隙尺度优先流特性[J]. 科学技术与工程, 2022, 22(23): 9927-9936.
Ning ruihao, Leng yanqiu, He zhiyuan, et al. Research on pore scale preferential flow characteristics of loess based on CT[J]. Science Technology and Engineering,2022,22(23):9927-9936.

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历史
  • 收稿日期:2022-02-28
  • 最后修改日期:2022-05-27
  • 录用日期:2022-06-03
  • 在线发布日期: 2022-09-06
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