The Research On Expansive Model Experiment Of The Polymer In Plane Single Fracture And Numerical Simulation

Affected by the potential adverse geological structure,leakage,water inrush and other natural disasters are technical problems that are not always avoided in the underground engineering construction and mining process.In recent years,numerous water inrush accidents caused by tunnel excavation and mining have caused significant casualties and property losses.Not only that,destruction of soil and water resources,water exhaustion,ground collapse and other ecological disasters due to tunnel excavation and mining are often appear,and it have caused severe economic losses and adverse social impact.Polymer grouting technology as a new foundation engineering rapid repair reinforcement technology is widely used in void road filling,anti-seepage reinforcement,tunnel water-bursting and mud-bursting plugging and other engineering applications.But due to the special nature of polymer materials,the imperceptibility of construction and complexity of grouting mechanism,the theory research on polymer grouting is lagging behind,causing the present stage grouting construction mainly relying on the experience,there are a lot of blindness,which in a certain extent restricts the popularization and application of the polymer grouting technology.Aiming at the above background and problems,according to looking up domestic and foreign pertinent literature,based on the analysis of the results of previous studies,I use model tests,theoretical analysis and numerical simulation to study the diffusion characteristics of polymer in plane single crack.The main contents and conclusions are as follow:(1)I design a plane single fracture test platform with the advantages of parameters adjustable and visualized and so on.During the test,using a high-definition camera to shoot the expansion diffusion process,recording diffusion distance with the change of time,and using the film pressure test system to real-time collect and analysis pressure distribution of polymer materials under the conditions of different fracture aperture,different diffusion distances and different time.(2)Labs show that the diffusion morphology of polymer in the plane single fracture presented circular or oval;when the fracture aperture is the same,the grouting quantity is bigger,the final diffusion distance is bigger,the maximum pressure is bigger;in the same slurry parameters and rock conditions,there is an optimum fracture aperture that will allow the slurry to expand with a maximum distance;when the polymer is filled in a horizontal single crack,the pressure distribution obviously decays along the slurry diffusion direction,and the maximum pressure occurs nearby the grouting hole;there is a good correlation between the pressure and the different distance when the polymer is diffused;the maximum pressure appears after the reaction between 50s-100 s.(3)Based on computational fluid dynamics theory,comprehensive using Finite Volume Method and Volume Of Fluid,establishing the diffusion calculation model of polymer material,simulating and analyzing the diffusion process of polymer in the crack and comparing with the test results.The simulation results are much close to the experimental results,and it displays that it is feasible that using the calculation model to simulate the diffusion process,morphology and pressure distribution of the polymer in the plane single fracture,checking the rationality of calculation model,and laying a foundation for the study of the diffusion characteristics of polymers in fracture.