| The rock-mass fracture grouting is an effective method to control the perennial water inrush problem in most deep-buried mines and tunnels.However,due to the complex existing state of the rock mass fractures,there are many deficiencies in the theoretical study on the rock-mass fracture grouting.Among them,due to the irregular roughness on the fracture surface of the rock mass,the raised parts of the rough surface will contact and bite during the deformation process,forming a local "island-like" low hydraulic opening area,which hinders the grout diffusion and the gelation process.However,the research on such "island-shaped" low hydraulic opening is very scarce,which seriously restricts the interpretation and analysis on the grouting diffusion mechanism of the rock mass fractures.Currently,in the deep high-stress area,the occluding effect of the fracture surface is strong in the deformation process,which frequently leads to the formation of the "island" low-hydraulic opening area after the closure of local convex surface,which has a significant control effect on the hydraulic properties of the fracture surface.In view of this problem,grouting is a significant technical means for the reinforcement and seepage prevention of the deep-buried cataclysmic rock mass.Based on the original and engineering hydrogeological conditions of Jinchuan mining area as the engineering research background,this paper developed and successfully produced a model test platform and pressure monitoring system to simulate the rock-mass fracture grouting.Specifically,the indoor model test and numerical simulation were taken as the research means to analyze the law of the slurry diffusion in the hydrodynamic environment.Eventually,conclusions were drawn as follows:1.The original and engineering hydrogeological conditions in Jinchuan mining area was expounded,and the stress field and seepage field conditions in deep high stress area was analyzed,providing the basic reference materials for grouting engineering construction and research.2.The basic characteristics of the deep cataclysmic rock fractures as well as the grouting slurry diffusion model of the rock mass fractures in Jinchuan mining area was analyzed,and a model test platform and pressure monitoring system for simulating rockmass fracture grouting were developed.The device is capable of simulating the real rockmass fracture plane conditions to the greatest extent,and can be adjusted and applied repeatedly to meet various test purposes.3.According to the design concept of the grouting model test platform and pressure monitoring system for simulating rock mass fractures,a physical model of the large-size fracture simulation test platform was made,and a study of the grouting slurry diffusion in a hydrodynamic environment was carried out.4.The COMSOL Multiphysics software was adopted to conduct laboratory test and numerical model simulation,and the smooth single crack grout diffusion under the hydrodynamic environment.5.On the basis of a single fracture grouting in the hydrodynamic environment,the COMSOL Multiphysics software was applied to further establish a single fracture model with the "island-like" low hydraulic opening,and carry out numerical simulation of slurry diffusion in moving water environment.The diffusion radius,seepage velocity and seepage pressure in the direction of downstream flow in the process of grouting of single fracture with smooth and the "island" low hydraulic aperture were compared and analyzed.Moreover,the influence degree of the physical and mechanical aperture,the flow velocity,the grouting rate,and the effective radius of the "island-like" low hydraulic aperture area on grout diffusion was studied.Figure 57 Table 9 Reference 97... |
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