岩土工程学报2016，Vol.38Issue(7)：1262-1268,7.DOI:10.11779/CJGE201607013
岩体裂隙面粗糙度对其渗流特性的影响研究
Influence of roughness of rock fractureon seepage characteristics
摘要
Abstract
In order to study the relationship between surfaceroughness of rock fracture and seepage mechanism, the rock fracture is divided into several segments along length direction,andthe symmetric rough fracture surface is generated by setting random height at the end of each segment. Based on the D2G9 model, which is used for simulating incompressible fluid, the classic Poiseuille flowis verifiedusing the lattice Boltzmann method, the seepage characteristics of rock fracture with different relative roughnessesare calculated, and the influence of surface roughness on the flow state of fluid is discussed. The results show thatthefracture wall blocks the flow of fluid, and flow state near wall changes dramatically. At the same time, with the increase oftherelative roughness, there are vortices in the local area, where the changes of fracture width are dramatic, which induces the increase of internal friction in the fluid.Under the equal flow discharge of section in unit time and average fracture width, thepresentnumerical solutionis compared with the theoreticalone of multi-parallel plate. Because the multi-parallel plate theory neglects the partial pressure drop caused by changes of fracture width, the maximum error of the pressure drop in the middle section is 15.2% less than the numerical solution for fracture scheme with relative roughnessδ=0.01674. When the relative roughness is small, the pressure in the middle of fracture is similar to that of the smooth plate model, and the trend is almost linear. The pressure deviates from the line direction with the increase of relative roughness, and the changes are larger at the section, where the fracture width changes from narrowness to broadness suddenly.关键词
岩体裂隙/渗流特性/粗糙度/数值模拟/格子Boltzmann方法Key words
rock fracture/seepage characteristic/roughness/numerical simulation/lattice Boltzmann method分类
建筑与水利引用本文复制引用
王志良,申林方,徐则民,李邵军..岩体裂隙面粗糙度对其渗流特性的影响研究[J].岩土工程学报,2016,38(7):1262-1268,7.基金项目
国家自然科学基金项目（51408284，51508253，U1502232）；昆明理工大学人才培养基金项目 （）
