The Supporting Technology And Field Monitoring Research On Loose Conglomerate Of Roadway

The special engineering conditions of loose rock conditions and rich water hydrology conditions commonly encountered in mine construction in western region of China,bring the adverse effect of shaft excavation,gangue and supporting construction,significantly reducing the support strength,resulting in support structure failure,resulting in wellbore and roadway deformation,to adversely affect the mine construction.To Erdos Hong Qing Liang coal mine area rich unconsolidated conglomerate aquifer shaft construction project as the research object,according to the 3-1 at the top of coal seam mud,weak cementation crushing,rich water and50m3/h water rich loose gravel stratum,studied by means of field investigation,theoretical research,indoor test,numeric analysis,field monitoring and fuzzy evaluation combining the study under rich water condition loose conglomerate geological conditions of inclined shaft supporting technology and based on the monitoring results of wellbore stability by fuzzy evaluation,the main contents include:(1)Site investigation was conducted to clarify the formation conditions and water rich characteristics of the conglomerate layer,and to explore the failure mechanism of the loose gravel retaining structure.(2)The physical mechanical characteristics and rock mineral composition analysis and laboratory test test,obtaining conglomerate density,water content W,strength,E modulus and mineral composition index,analysis of the failure mechanism of loose conglomerate shaft for supporting parameters provide efficient data calculation and numerical simulation.(3)Based on field investigation and theoretical analysis,the support technology of unconsolidated conglomerate shaft under rich water condition is studied,and the support scheme for inclined shaft under water rich and loose condition is put forward.A numerical calculation model of loose conglomerate wellbore under rich water condition,analysis of excavation process of shaft support structure stress characteristic,and the variation of the positive and negative effects on the construction process of excavation supporting stability of supporting structure of rock surface deformation,and provide scientific basis for the final selection of retaining structure.(4)For anchor bolt stress,bolt pulling force,the surface of surrounding rock convergence deformation monitoring field test project,established under rich water condition loose conglomerate wellbore dynamic monitoring system,real-time monitoring and feedback monitoring data to provide a scientific basis for supporting optimization of supporting scheme selection,to provide effective data support for the evaluation of wellbore stability.(5)Based on analytic hierarchy process and fuzzy mathematics theory,fuzzy evaluation of wellbore stability is carried out based on monitoring feedback data,which provides effective theoretical support for the safety of shaft construction and the operation safety in the later stage.Through the above research,reveals the failure mechanism of deformation under rich water condition loose conglomerate of inclined shaft,design and construction scheme and mining excavation and the positive and negative sectional support scheme,using numerical simulation method,analyzed the stress characteristics of lining structure,established under rich water condition loose conglomerate wellbore dynamic monitoring system,AHP and the method based on fuzzy mathematics theory,the fuzzy evaluation of wellbore stability.The research results will effectively guide the support construction technology of unconsolidated conglomerate inclined shaft in the condition of rich water,and provide scientific basis for the construction of mine in Western china.