基于3D打印的粗糙结构面模型表征及渗流特性试验研究
Characterization of rough fracture model and the seepage characteristics based on 3D printing technology
王培涛 1黄浩 2张博 3王路军 4杨毅4
作者信息
- 1. 北京科技大学土木与资源工程学院,北京 100083;国能神东煤炭集团有限责任公司煤炭开采水资源保护与利用国家重点实验室,北京 102201;北京低碳清洁能源研究院,北京 100011
- 2. 北京科技大学土木与资源工程学院,北京 100083
- 3. 北京科技大学土木与资源工程学院,北京 100083;核工业北京地质研究院,北京 100029
- 4. 国能神东煤炭集团有限责任公司煤炭开采水资源保护与利用国家重点实验室,北京 102201;北京低碳清洁能源研究院,北京 100011
- 折叠
摘要
基于Weierstrass-Mandelbrot(W-M)分形函数开展三维粗糙结构面表征,讨论了 W-M典型几何参数对三维曲面形态影响,分析确定对应于典型Barton节理JRC轮廓线的二维与三维W-M几何参数.基于自主设计结构面渗流测试系统,结合3D打印开展不同分形参数和开度的裂隙渗流试验,试验结果表明:随着水力梯度和粗糙度的增加,流体的流动表现出明显的非线性,Forchheimer方程的系数A与B都随着裂隙粗糙度的增加而增大,随着裂隙开度的增加而减小;随着裂隙粗糙度的增加,临界雷诺系数Rec趋于减小,说明流体流动趋于非达西流动.光滑表面流体的流场流速比较均匀;粗糙裂隙表面流场更加复杂,整个粗糙面上存在多个高流速区域和低流速区域.研究成果可为裂隙渗流特性研究提供了可靠的分析方法和模型.
Abstract
A three-dimensional rough structural surface characterization was carried out based on the Weierstrass-Mandelbrot(W-M)fractal function.The effects of typical W-M geometric parameters on the three-dimensional surface morphology were discussed.The two-dimensional and three-dimensional W-M geometric parameters corresponding to typical Barton JRC curves were analyzed and provided.Experimental fracture seepage tests on specimens with different fractal parameters and fracture aperture were conducted using a self-designed fracture seepage system based on 3D printing technology.The test results showed that the fluid flow exhibited obvious nonlinearity with increasing hydraulic gradient and roughness.The coefficients of A and B in the Forchheimer equation increased with increasing fracture roughness and decreased with increasing fracture aperture.Meanwhile,the critical Reynolds coefficient tended to decrease as the roughness increased,indicating a tendency towards non-Darcy flow.The analysis of fluid flow patterns revealed that the flow velocity of the smooth structure surface of the model was relatively uniform.The flow field of the rough surface was complex showing several high and low flow velocity regions along the rough surfaces.The research results provide reliable analytical methods and models for the study of fracture seepage characteristics.
关键词
岩石裂隙/渗流试验/分形维数/粗糙度/3D打印Key words
rock fracture/seepage test/fractal dimension/roughness/3D printing引用本文复制引用
基金项目
国家重点研发计划(2021YFC2900500)
国家重点研发计划(2023YFC2907401)
国家自然科学基金(52074020)
煤炭开采水资源保护与利用国家重点实验室开放基金(2019)(WPUKFJJ2019-06)
中央高校基本科研业务费专项北京科技大学青年教师学科交叉研究项目(FRF-IDRY-21-00l)
出版年
2024
国家科技期刊平台
NSTL
万方数据