Research On Floor Heave Control Technology Of High-stress Roadway In Xinjing Coal Mine

The paper introduces characteristics of floor heave for soft roadway with highground stress and influencing factors of floor heave.And classifications and methods ofroadway floor heave are expounded too. Aiming at the serious floor heave ofZhongtiaodai roadway laneway in Xinjing coalmine, the thesis analyzes characteristics ofroadway floor heave and major influencing factors of floor heave.According to theanalysis of observation data for surrounding rock, the author draws the conclusion thatroadway floor heave has a relationship with roadway floor, and there is a positivecorrelation between the deformation of the two sidewall and floor heave, as well as theform and the developing process of its floor heave are discussed, the components of theheave deformation are interpreted according to the Roadway Support Theory On BrokenRock Zone, and the floor heave deformations which arise from such factors as the elasticand plastic deformation, the rock dilatancy, and the swelling deformation result from rockmeeting with water, are established though theoretic computation or experimentalformulas.the deformation features. And the deformation law of surrounding rock wereanalyzed by the double grouting support methods of the shallow and the middle-deep,through engineering geological investigation, floor force state theoretical analysis,similar material simulation test and industrial test. The main results are as follows:(1)Cylindrical axial compression and tension strength tests were respectively carriedout by using Elastic-Plastic and Strain Softening constitutive model, the result shows thatthe calculation result of Mohr-Coulomb failure criterion was inconsistent with laboratorytest’s, which displayed a strengthening phenomenon before the stress peak. However, thecalculation result of Strain Softening failure criterion was basically identical withlaboratory test’s. At the preliminary stage of loading, the stress was increased as linearelastic feature, after stress peak, the specimen displayed a strain softening trait.(2)After setting of numerical calculation model and parameter, the stress field,displacement field and plastic zone was simulated by different control methods. Finallythe results provides the theory reference for control of the floor heave.(3)There is a zero point when the deep rock of roadway floor is moving. Above the zero point, the shallow rock would be compressed by extrusion and broken rocksmove to vertical direction in roadway; below the zero point, the shallow rock would becompressed by compression, and free mobile space of rock mass is controlled.(4)The distribution characteristics of grout capacity of the ACBGS show that groutcapacity is proportional to the range of the cracked rock mass. A statistics based on theamount of different hole, it is concluded that reasonable grout amount of each hole canrange from10.7m3to21.6m3in Zhongtiaodai roadway.(5)When the floor is broken，the Cement block whose sizes are length x width xhigh800x800x400mm will be Casted at the scene，after solidification，then Continueto punch. The technology can not only save manpower and material resources but alsosimplify the project and reduce the time.