Experimental Study Of Water Flow And Solute Transport In A Fracture With Different Flow, Geometry And Matrix Attributes

The groundwater flow and solute transport in the fractured media has been animportant research aspect in hydrogeology. The numerical study on water flow and solutetransport in fractured media at home and abroad has increasingly grown up, but someexperimental researches in fractured media remains need to be further improved, especiallythe research in dual-porosity media and natural fracture.Based on the study about water flow and solute transport in the fractured media athome and abroad, two sets of experimental equipments simulating groundwater flow andsolute transport is designed: a single fracture with an upper matrix and a single fracturestructured by a couple of marble slabs. Here the test simulating groundwater flow andsolute transport is performed in the two models, the results are studied and analyzed, andthe conclusions are drawn as followings:(1)Two flow systems of the dual-porosity media influent and supply each other, and theinfluence effect depends on the cross sectional area of contact surface between the two flowsystems.(2)Non-Fickian transport phenomena were observed in a single fracture of the dual-porositymedia. More large the cross sectional area of contact surface was, more obvious themulti-peak and long tailing phenomena were observed.(3)Equivalent hydraulic fracture width is1.84mm,the critical flow velocity is3.16cm/s andthe critical Reynolds number is484fit with the critical Reynolds theory.(4)In both Darcy flow and non-Darcy flow, the long tailing of the break throughcurves(BTCs) could be observed obviously.