土工基础

土工基础 ›› 2022, Vol. 36 ›› Issue (2): 258-260.

• 测试技术 • 上一篇    下一篇

3D打印裂隙渗流特征试验研究

李培鑫1,2，张 燕1   

  1. （1.武汉理工大学安全科学与应急管理学院，武汉 430072；2．中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室，武汉 430071）
  • 收稿日期:2020-10-12 修回日期:2020-10-28 出版日期:2022-04-30 发布日期:2022-04-27
  • 通讯作者: 张 燕（1983-），博士，副教授，研究方向为裂隙渗流。
  • 作者简介:李培鑫（1995-），硕士研究生，研究方向为裂隙渗流。

Experimental Study on Seepage Characteristics of 3D Printing Rock Fractures

LI Peixin1,2, ZHANG Yan1   

  1. (1.School of Safety Science and Emergency Management, Wuhan University of Technology, Wuhan 430072;
    2.State Key Laboratory for Geomechanics and Geotechnical Engineering, 
    Wuhan Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071)
  • Received:2020-10-12 Revised:2020-10-28 Online:2022-04-30 Published:2022-04-27

摘要： 裂隙渗流的研究对于地下工程的安全性评估具有重要的意义。根据节理粗糙度系数（JRC）标准剖面轮廓曲线，通过3D打印技术，制作出6个开度为2.5 mm不同节理粗糙度的单裂隙试样，对其开展渗透试验工作。试验结果表明：①当流速逐渐增大时，单位宽度的渗流量 q 与水力梯度i呈现较强的非线性关系，如果仅用立方定律计算，大大低估了模型的水力梯度的变化，出现明显的偏差；②JRC对裂隙渗流有很大的影响，当进口流速保持不变时，随着节理粗糙度的增大，裂隙两侧的压力逐渐增大，单位宽度的渗流量 q 与水力梯度i的非线性越来越强。

关键词: 裂隙, 节理粗糙度系, 3D打印, 渗水试验

Abstract: Seepage performance in rock fractures is of the great significance to the safety assessment in the underground engineering. Seepage test through the laboratory prepare on six (6) 3D printed rock fractures samples in accordance with the standard profile curve of the joint roughness coefficient (JRC) with a single opening fracture width of 2.5 mm. The test results show that: (1) when the flow velocity gradually increases, the seepage flow quantity, q, per unit width and the hydraulic gradient, I, presents a strong non-linear relationship. If only the cubic relation is used in the quantity estimation, the hydraulic gradient in the model changes could be significantly underestimated, and therefore, presents an obvious deviation from the estimated value. (2) the JRC has a great influence on the rock fracture seepage. When the inlet flow rate remains unchanged, with the increase of the joint roughness, the pressure on both sides of the rock fracture gradually increases. The non-linearity relationship between the seepage flow quantity, q, per unit width and the hydraulic gradient, I, becomes stronger and stronger.

Key words: rock fractures, joint roughness coefficient, 3d printing, seepage tests

中图分类号: