Study On Time-Space Evolution Law Of Visualization Of Sandstone Fracture Seepage Path

In view of the shortcomings in geological disasters such as water inrush and fracture seepage in underground engineering,this paper uses the self-developed visual test device and uses color tracing and bubble tracing technology to develop the effective flow path time and space of sandstone space distribution,to carry out visualization experiments of laws.By using image different gray area processing technology and cracking horizontal projection area analysis method,the image is partitioned and the horizontal projection area,effective flow,and cross-sectional width of the seepage are obtained.It is the first time to obtain the Study on Time-Space Evolution Law of Visualization of Sandstone Fracture Seepage Path.The specific research results are as follows:1)Reasonableness demonstration of visible seepage test device for rock fractureA set of independent research and development,can reflect the rocks from the visual angle of single fracture seepage characteristics of the device,and to simulate the deformation properties of the rock as the main technical indexes,and uses the transparent resin K39 instead of the original rock in visualization seepage test,and compared with the original rock seepage test,get the original rock fissure seepage test and seepage test visual difference coefficient,to get the accurate seepage characteristics of rock parameters provide the basis.2)Study on visual seepage characteristics under different filling and loading paths(1)improve the visualization experiment device,so as to conduct fissure filling sand test: find the water head particle rushed out of the effect and the water head particle compacting effect,expounds the effects of the two evaluation methods,and explains the fissure seepage of sand appeared first increases and then reasons,finally it is concluded that under the effect of different normal stress and the osmotic pressure coupling,the largest rock fracture opening access method.(2)The bubble filling experiment was carried out,and a method to accurately obtain the fracture opening of rock by bubble tracing was proposed for the first time.3)Study on the spatial and temporal distribution of seepage velocity at vertical Angle in spaceBased on the visualized test device,the spatial vertical Angle seepage test was carried out to obtain the projected area diffusion law of rock fissure seepage through the horizontal plane of the circulation channel under different normal stress and osmotic pressure.Based on the constant seepage flow rate through the visualized rock sample,the formula of fracture seepage velocity is established,and the relationship of Re under the influence of multiple factors(osmotic pressure,normal stress and distance from water inlet)is obtained by using the known seepage velocity of rock fracture,so as to determine the flow state of rock fracture water.4)Study on mechanical energy law of each section at vertical Angle of space(1)Based on the Bernoulli equation and considering the width of the rock fissure cross-section,the expression of the energy equation of the micro-flow of rock fissures is obtained,and the multi-factors(osmotic pressure,normal stress,and water inlet)are derived.The distance of the mechanical energy relationship under the influence.(2)The hydraulic gradient expressions under different normal stress and osmotic pressure conditions are established.It is concluded that the hydraulic gradient of the fracture water decreases with the increase of the distance from the water inlet and increases with the increase of the osmotic pressure.5)Study on grouting mechanism under vertical space angle(1)To carry out crack grouting test at the vertical Angle of space,and obtain the law of slurry horizontal projection diffusion area with different normal stress and osmotic pressure.Compared with the law of horizontal projection diffusion area of seepage,the difference expression of diffusion area between them is obtained.(2)Based on the existing grouting anti-seepage and plugging problem combined with the results of this experiment,two kinds of plugging measures are proposed for the project of water inrush will occur and water inrush in underground engineering.Providing the basis for anti-seepage and plugging in engineering...