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| Research on seepage properties of rough fracture considering geometrical morphology |
| SHEN Linfang1，ZENG Ye1，WANG Zhiliang1，LI Shaojun2 |
| (1. Faculty of Civil Engineering and Mechanics，Kunming University of Science and Technology，Kunming，Yunnan 650500，China；
2. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China) |
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Abstract To study the influence of geometrical morphology on the seepage properties of rough fracture，the three dimensional rough fracture surface is generated according to the midpoint interpolation method. A lattice Boltzmann model is proposed to simulate the seepage of rock fracture，and its validity is verified by an example. Finally，the effects of geometrical morphology on pressure drop are discussed for rock fracture with single rough surface. The results show that the distribution of average pressure drop between the adjacent nodes is similar to the fluctuation height of fracture surface along the seepage direction，the average pressure drop increases at the location where the fracture surface raises，and decreases in the sunken region. The influence of geometrical morphology on the local pressure drop is different for the position with different distances to the fracture surface，the closer to the fracture surface，the more sensitive of the geometrical morphology to the local pressure drop，especially in the area where the fracture surface fluctuates sharply. The inlet velocity also affects the average pressure drop，the larger flow velocity results in the greater resistance of the rough wall to the fluid and the corresponding energy loss，the more significant pressure drop is generated as a result. Under the laminar flow regime，the inlet velocity is approximately linear with the average pressure drop.
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2019, Vol. 38 
