The Research Of Support Optimization And Safety Monitoring Of Large Section Open-off Cut Of Broken Roof

In recent years, in order to introduce large mining equipment, cut the size of the cross section is more and more big, the existing bolt support design method has been unable to meet the security and stability requirements, be badly in need of solving large span, large broken roof bolt (cable) support parameters design and safety problems, to find a suitable large section bolting support parameter design method.The paper for the super large section open-off cut in broken roof supporting surrounding rock stability analysis and safety monitoring system, ensure the safety production of coal mine, create a certain economic benefits, have important real significance.The paper through field investigation and monitoring of surrounding rock deformation, analysis of large cross section open-off cut tunnel destruction and damage form, design of bolt (cable), W type steel, metal mesh, Dan Tizhu combined supporting scheme consisting of large section combined supporting system for rectangular tunnel, excavation supporting engineering.Put forward " the engineering geological data analysis-initial design-site of mine pressure and deformation monitoring-information feedback-modify the design" dynamic information design method. The key technologies for supporting the roof rock structure detection and supporting later roof convergence deformation monitoring of the implementation of this method is the construction side, edge, edge modify monitoring, applied value is had in practice. Through hydraulic pillow type dynamometer for anchor, single prop pressure monitoring recorder, roof separation indicator consisting of large section joint monitoring system, and by artificial neural network on the rock structure identification, and the monitoring section of roof fall risk area prediction, real-time adjustment of support parameters. Application of the finite element analysis software ANSYS to carry on the dynamic simulation, analysis under different supporting conditions supporting safety coefficient, through theoretical analysis and numerical calculation of comprehensive determination of support parameters, and the theory, experience, monitoring data information feedback to optimize the design parameters to, we can optimize the design. Through laboratory test, field of rock deformation monitoring, theoretical analysis and other means, analysed the Aries for mine large cross section open-off cut roadway surrounding rock stress and displacement of the temporal and spatial variations, in order to determine the rational support form and support parameters.In this paper, the use of neural network monitoring section of roof fall hazard zone prediction, realize the open-off cut of three-dimensional visualization, safety monitoring. Through numerical simulation and theory calculation combined dynamic monitoring system it is proved that the proposed super section combined supporting method meet the open-off cut on the supporting stiffness, strength and stability requirements, will also support program economic benefits evaluation. To sum up, the thesis provides the research results and detailed, the technique route and research program is correct, test method and theory research to have the innovation, research achievement achieves international advanced level.