Research On Chamber Floor Heave Mechanism In Mining Area Under Complex Mixing And Its Support Technique

With increasing the depth of underground mining of coal resources Chamber in which the rock environment were more complex, engineering problems appearing such as:deformation earth pressure, difficult supportion. Chamber damagment is the result of complex conditions. Under complicated conditions, how to take effective measures to control the chamber by the destruction of more and more the concern of the industryOn the basis of research result about the failure mechanism of the chamber and roadway and the dynamic pressure on the coal mine in domestic and international, the thesis described the influencing factors of the chamber and roadway.analysis the productive mechanism of floor heave, established the mechanical model of the chamber and roadway floor, derived the relevant expression of the plastic zone. and calculate the depth of plastic zone floor.By combining with the project upper substation of East-B track in Xieqiao Coal. Considering the factors of installation of equipment on the basis of a large base load and demanding of deformation having tried on the rock in bottom chamber of the substation indoor. Providing a basis for analysis of the stability of surrounding rock in bottom chamber and numerical simulation.Using finite element software for FLAC-3D numerical simulation chamber Established and reinforced steel shell U joint supporting floor heave prevention programs The results showed that using the program made the two side of chambers and roof and floor having a small amount of plastic damage the obvious damage can be seen to the plastic zone floor occurs after yielding roof and floor gradually stabilized significantly narrowed the scope of stress distribution tensile, compression zone and the plastic zone were significantly reduced Significantly lower chamber deformation to control the most obvious effect of floor heave. Thesis on the rock before and after the end of heave convergence, loose ring, the process of governance by the force of steel and concrete on-site monitoring results and engineering application shows foundation slab construction meet the design requirements the basis of reasonable force and a certain safety margin reinforced shell to control chamber floor heave, chamber and effectively improve the stress distribution of rock tunnel greatly reduce the amount of displacement chamber increase the carrying capacity of supporting structure to ensure the long-term overall stability of the foundation slab can effectively address the dynamic pressure chamber and tunnel under the floor heave problems.Thesis research has been successfully applied at the upper substation of East-B track in Xieqiao Coal. Dynamic pressure for similar future chamber floor heave provides an important reference works under the conditions of the dynamic pressure chamber and surrounding rock deformation mechanism and treatment methods of improvement and development of a larger role in promoting...