考虑几何形貌特征的粗糙岩体裂隙渗流特性研究

doi:10.13722/j.cnki.jrme.2018.1282

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摘要为了研究粗糙岩体裂隙几何形貌对其渗流特性的影响，采用中心插值法构建三维粗糙裂隙面，基于格子Boltzmann方法，建立模拟岩体裂隙渗流的数值模型，并结合算例验证了该模型的有效性。最后，针对不同相对粗糙度的裂隙面，讨论单侧粗糙岩体裂隙几何形貌对其渗流压降的影响。结果表明：岩体裂隙沿渗流方向相邻点处的平均压降与裂隙表面沿程起伏状况呈相似的变化趋势，在壁面凸起位置平均压降呈增长趋势，而在凹陷的部位则表现为降低。距壁面距离不同裂隙几何形貌对局部压降的影响也有所差别，距离壁面越近裂隙面几何形貌对局部压降的影响越敏感，在裂隙面起伏变化剧烈的部位尤为突出。同时，入口流速也影响着岩体裂隙平均压降，流速越大，粗糙壁面对流体的阻力越大，相应的能量损耗也越大，从而导致相邻点间的平均压降变化越显著，在低雷诺数层流情况下，裂隙入口流速与相邻点的平均压降近似呈线性关系。

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	申林方1
	曾叶1
	王志良1
	李邵军2

关键词 ：岩石力学, 岩体裂隙, 渗流, 几何形貌, 格子Boltzmann方法, 相对粗糙度

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.

Key words： rock mechanics rock fracture seepage geometrical morphology lattice Boltzmann method relative roughness

引用本文:

申林方1，曾叶1，王志良1，李邵军2. 考虑几何形貌特征的粗糙岩体裂隙渗流特性研究[J]. 岩石力学与工程学报, 2019, 38(S1): 2704-2711.
SHEN Linfang1，ZENG Ye1，WANG Zhiliang1，LI Shaojun2. Research on seepage properties of rough fracture considering geometrical morphology. , 2019, 38(S1): 2704-2711.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2018.1282 或 http://rockmech.whrsm.ac.cn/CN/Y2019/V38/IS1/2704

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