Study On The Enlarging Excavation Sequence And Supporting Project In The Whole Coal Roadway

In order to solve the problem of engineering technology encountered during medium and small coal mine resources integration, promote the application of new technology of coal industry in constructing, this paper take Shanzhuang Mine of Shanxi Coal Transportation and Sales Group south and east return air roadway cross-section enlargement technique engineering as the research background, systematically research whole coal roadway the surrounding rock structure features using the elastic thin plate bending theory and finite-difference, borehole peep and so on theories and methods, establish mechanical model the that can reflect its basic characteristics, And fully analyze the general rules of its mine pressure appear and the general rules of the mine pressure appeared on the comprehensive analysis, reveals the failure characteristics of coal roadway deformation of generating mechanism, analyzes the surrounding rock mechanics effect in large excavation construction process brush, for whole coal roadway cross-section enlargement construction provide reasonable disassembly, excavation, remove support plan. In short, this paper conclude the following points in research of the construction of roadway enlargement in the following points:(1) The surrounding rock structure features and the rules of mine-pressure appear of whole coal roadway。(2) Systematically analyse the whole coal roadway surrounding rock common deformation and failure characteristics and mechanism, roof strata deformation and failure resulted by enlargement excavation reduce mechanism。(3) In the Angle of different coal seam in the excavation of the surrounding rock of roadway deformation caused by failure characteristics are studied systematically。In a horizontal layer wall rock, roof strata in the surrounding rock vulnerable to tensile, overburden bed separation grouting, or form irregular take fall zone. In the tilt layer wall rock, tilt in asymmetric stress rock under the action of deformation and failure, one side of the upper corner of the first happened damage, destroy the most serious also。In the steep inclined surrounding rock bodies, along with the increase of rock dip Angle, the asymmetry of the rock mass structure strengthening, so the level of surrounding rock stress and vertical stress more shows a high degree of asymmetric, causing the coal seam sliding along the level, in the upper left corner caused by coal side area failure。(4) Detailed comparative analysis metal shed support and bolt support Compared with metal shed supporting structure, bolt support is more suitable for the whole coal roadway support, will bolt loose coal body into a stable overall structure to maintain the stability of the roadway。(5) Based on the elastic thin plate bending theory, establish mechanical model, analysis and calculation theoretical length formula of disassembly, then according to the roadway actual spacing span of metal shed supporting, reasonable length of one removed wood supporting is2m, taking the and support simultaneously, the construction method that taking disassembly, excavation and support at the same time is conform to the requirements of progress and security of the engineering。(6) Systematically analyze the influence factors of roadway cross-section shape select and surrounding rock mechanical effect of rectangular, vaulted two roadway section layout。(7) The best roadway cross-section enlarging excavation sequence determine that the first step is to excavate roof coal seam, the second step is two sides coal seam。(8) Systematically analyze the bolt length, bolt density, the angle of corner bolt and so on supporting parameters are to have an influence on stress distribution, change characteristics and plastic damage area distribution of whole coal rectangular roadway, then determine the optimal support plan。(9) Analysed from the view of whole coal roadway anchorage support effect supporting by steps is better than the overall supporting。...