三维离散裂隙网络渗流模型与实验模拟

3-D seepage flow model for discrete fracture network and verification experiment

本文根据天然裂隙系统发育规律及其渗透机制 ,将复杂的裂隙系统划分成带状断层、面状裂缝和管状孔洞三大类型 ,在忽略岩块渗透性的前提下 ,建立了由管状线单元、缝状面单元和带状体单元组合而成的三维裂隙网络渗流数值模型 ,为检验模型的合理性 ,在室内利用混凝土试块制成的离散体来模拟三维裂隙网络结构 ,设定不同的边界水位和降雨入渗对裂隙中渗流进行了实验 ,利用数值模型对实验结果进行了模拟 ,初步验证模型是合理而可靠的 .

The complicated fracture networks are divided into belt-shaped fault, plane-shaped fracture and pipe-shaped structure, and a 3-D seepage flow model consist of three types of fracture element is established. Experimental study is carried out in lab. to verify the reasonability of the model.The discrete rock blocks are modeled using concrete blocks. The seepage flow field obtained is in good agreement with the numerical simulation.