Study On Seepage Characteristics And Grouting Reinforcement Technology Of Argillaceous Broken Rock Mass In Fully Mechanized Face Fault Zone

Based on 10102 working face of Jiajiagou Coal Industry,the argillaceous broken rock mass was extracted and processed.Through the design and implementation of the compacted water seepage experiment of the rock mass,the experiment of the diffusion characteristics of the slurry,and the mechanical experiment of the slurry to the solidification of the rock mass,the experimental parameters required by the research are analyzed.Using FLAC^3D,a three-dimensional numerical model for the excavation of the Open-off Cut roadway was established,and the numerical calculation of the subsidence of the fault roof before and after the slurry reinforcement was made.Finally,combined with the actual problems,the grouting reinforcement technical scheme was made and the engineering application was carried out.Mainly achieved the following results:（1）The processed rock material was recombined and the experimental materials were obtained.The percolation experiment was designed and it was concluded that the permeability coefficient of the rock mass decreased with the increase of axial pressure and decreased with the increase of water pressure.However,the suppression of axial pressure is significantly greater.The larger the particle size of the rock mass,the greater the permeability.The mud content of the rock mass plays an inhibitory role on its permeability.（2）A grouting diffusion experiment was designed.It shows that the diffusion capacity of chemical slurry is much higher than that of two cement slurries.An increase in grouting pressure increases its ability to diffuse.Due to the presence of particles,cement slurry has a weaker ability to diffuse.The cement slurry with a water-cement ratio of 1:0.8 has a slightly greater diffusion capacity than the cement slurry with a water-cement ratio of 1:1.By analyzing the three diffusion theories,it is shown that the diffusion of the slurry in this type of rock mass accords with the diffusion and diffusion.（3）Uniaxial compression experiments,cubic splitting tensile tests and shear tests were designed in the laboratory.It is indicated that the epoxy resin can better bond the contact surfaces between the rock particles.It also enhances the mutual attraction among the molecules inside the rock mass.（4）The model of the Open-off Cut roadway excavation was established with FLAC^3D.Through numerical calculation,the amount of roof subsidence before and after slurry consolidation was obtained.It shows that the epoxy resin can better control the sinking of the roof.The ability of the cement slurry to control the sinking of the roof is limited.At the same time,the influence of the grouting process parameter"λ"on controlling the sinking of the roof is also obtained.（5）Finally,combined with the problem of faulted argillaceous broken roof of Jiajiagou Coal Industry 10102 working face,the technical scheme of grouting reinforcement according to on-site construction was designed.By combining the conclusions of experiments and simulation calculations,the selection schemes of slurry materials and grouting process parameters were established.By constructing“artificial false roof”,filling the roof cavity and grouting to strengthen the broken roof area,the practice proved the accuracy of the research results and effectively dealt with an engineering problem.