| This paper bases on the engineering background of112202coal face inningdong mining area shicaocun mine that affected by the inundation, Integratedapplication site measurement, theoretical analysis, physical modeling andnumerical simulation of the combination of research methods, starting with theprocess of the roadway under the influence of the progressive water byenvironment and dynamic deformation,to the center of water damage in theperiodic characteristics and the attenuation law of anchorage performance, thebehavior pattern of seam roadway rock erosioned by water were studied. itreveals the roadway flooding anchor property law and weakening the securitycontrol mechanism. Major work and conclusions are:By the analysis of mineral material composition and X-ray diffraction ofclay relative content,it shows that shicaocun mine roof siltstone, silty mudstoneroof, floor clay mineral kaolinite,65%,45%and64%. One roof silty mudstonesmectite, Eamon was significantly increased mixed layer, both the total contentof31%. Well#2-2Coal Mine plum top and bottom of the mineral compositiondirectly mainly kaolinite, quartz, illite, smectite, Eamon mixed layer, Inaddition, there exist a number of other trace minerals. As illite, smectite, Eamonhas strong absorbent mixed layer, in contact with water generally occurs underconditions of rapid expansion and clay.By the SEM experiment showed that: Plum coal seam#2-2well within themicro-fractured rock, for the cementation between the grains. The existence ofthese cracks easy penetration of water molecules, the combination of organic matter in clay minerals, resulting in a complete, without disturbance andweathered rocks of the obvious effect of clay and swelling. Meanwhile, whenroadways Excavation Rock, the rock mass produce a large number ofmicro-cracks, showing bands of different rules and the fracture networkstructure, the existence of these micro-cracks provided a further water-rockinteraction of the channel occurs, leading to illite smectite, mixed layer imonfull with water, which accelerates the interaction between water and clayminerals.Resistance to weathering of rock specimens from the pilot can see: Pl um#2-2Well mine roadway roof and floor of coal shale in the lab soakingargilliferous easy to collapse, clay disintegration time of about1.5to2.0hours,this time strength has been basic small, can be broken by hand. In terms oftiming, weathering the impact is greater than water, so water in the undergroundtunnel to avoid soaking for too long, try to use fast thinning, drainage, cutblocking the way to reduce the impact of the surrounding rock water impact.Roadway immediate roof silty mudstone with strong expansion properties,according to the measured maximum pressure and maximum expansion of thefree swelling capacity, swelling characteristics should be the division level, todetermine the design, calculation of the required resistance to the expa nsiondeformation is limited to a value, that is within the elastic deformation of rock.Starting from control the dynamic process for seam roadway deformationlaw of inundation proposed inundation seam roadway control techniques,include white washing technology, high-performance anchor with a networkcable technology and grouting technology, seam roadway of inundation methodof rapid excavation techniques were studied.According to the production specification of geological site conditions, itproposed implementation scheme of the industrial tests in site, and studiedpropagation law of rock external and internal deformation in digging process.ithave a good effect in the support of engineering practice, it can effectivelycontrol the deformation of seam roadway inundation. |
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