Study On Control Of Surrounding Rock Deformation Of Large Section Roadway Of Limin Coal Mine

At present, Coal remains dominant in china’s primary energy structure, and it will be china’s main energy source in the future for a very long time. Most coal mining in our country is underground mining. With the increasing scale of coal mining and the raising mining intensity, mechanized coal mining technology has been well developed, comprehensive mechanized top-coal caving technology in thick coal seam and mining overall height technology in the medium-thick coal seam have been widely promoted and applied. Therefore roadway cross-section requires increasingly greater, Larger roadway section makes it more difficult to support.Based on the surrounding rock’s deformation control of auxiliary transporting rise in mining district Ⅱ0116in Limin coal mine, this paper systematically research deformation control technology in large section roadway with theoretical analysis, numerical simulation for FLAC3D, site monitoring and other ways to study according to design method of dynamic theory. The main contributions are as follows:By analysing surrounding rock deformation failure mechanism, damage characteristics and damage reasons in large section roadway and studing the effects on stability of surrounding rock of supporting,then came to the basic principles of surrounding rocks stability control. Take some corresponding supporting measures according to the mechanical characteristics and stress state of surrounding rock to improve the state of surrounding rock stress distribution and to control surrounding rock deformation trend, in order to maintain the stability of surrounding rock; do coal and rock physical mechanical experiments experiments in rock mechanical laboratory with the samples taken from Limin coal mine site, then came to the physical mechanical property parameters (including density, compressive strength, tensile strength, elastic modulus, Poisson’s ratio, within friction corner and cohesion)of coal seam and its surrounding rock where auxiliary transporting rise in mining district Ⅱ0116.and get elastic modulus and shear modulus through calculation. Work out4different initial roadway supporting schemes for auxiliary transporting rise in mining district Ⅱ0116by analogy and theoretical calculations based on coal seam and rock’s physical mechanical property parameters of coal mine; By FLAC3D software, numerical simulations of excavation supporting process of auxiliary transporting rise in mining district Ⅱ0116is carried out with excavation not supporting conditions and6sets of supporting schemes, eventually determinesed optimal supporting programme through analysis comparison of the distribution of plastic zone of surrounding rock and and top backplane and the two help vertical level displacement diagram simulated out; According to the real-time monitoring on top floor separation, roadway deformation and anchor the forces in engineering scene，find that roof and floor separation is small, roadway deformation gradually stabilized, and the force is always in the anchor within reasonable limits, this verifies the reasonableness of the combined support, indicating the rational design of selected program and supporting parameters.