Study On The Mechanics And Support Technology Of The Roadway Floor Heave In Deep Mine Block

It’s important engineering application value to research the mechanics and supporting technology of the roadway floor heave in deep mine. Depended on the second assistant lane in a coalmine in Bin Chang mine area, the mechanics and supporting technology of the tunnel floor heave was researched by the combination means of lab experiment, theoretical analysis, numerical simulation and site tests. The main work and conclusions are:(1)Based on the stress and strain factor of rock unIaxial compression, the occur phase of tunnel floor heave was obtained, which included compression, elasticity, elastic – plastic, sottening state and slip state deformation. The result of indoor test showed that the rock factor of roadway floor consisted of too much montmorillonite, which easily lead to expand and produce large expansion stress. The floor rock of roadway was divided into moderate soft rock, at the same time, the type of floor heave was ensured to be hydor-expansiveness. The above analysis revealed the mechanics of roadway floor heave.(2)The main influence factors of floor roadway heave had rock rheology, soft rock expansion, floor un-supporting, excavation nearby the roadway and the influence nearby the mine area. Based the above analysis, the mechanical model of floor heave was established and the floor stress was calculated. Considered from three aspects,which were elastic – plastic deformation, hydor-expansiveness deformation, and rheology deformation, the floor heave value was estimated.Finally, the floor heave support program,which was to added the reinforced concrete inverted arch & bottom corner anchor,was put forward. Besides, the support program was finish designing.(3)With the FLAC numerical simulation, the feasibility of floor heave support program which put forward in the paper was verified. The result of numerical simulation showed that the surrounding rock deformation was little that the floor heave treatment effect was obvious, and the floor heave support program was feasible.(4)The result of industrial test indicated that the floor heave value was 22.4 mm, which was less than the value before floor heave treatment. The floor deformation was so controlled effectively that it met the deformation require of mine block. More importantly, the research results had important reference value to the similar projects.