Drum Mechanism And Control. Gequan Mine Soft Rock Roadway End Of The Study

The mechanism and control of soft-rock roadway floor heave is a difficult problem in mining subject. In this paper, such physical and mechanical properties of the surrounding rock around the -190 level southern roadway in Gequan coal mine as softening, weathering, swelling result from rock meeting with water, dilatancy and rheology are fully analyzed, associated with its engineering practice; according to the observed values of displacements of surrounding rock mass around the roadway, the relation between the deformation of the two sidewalls of the roadway and the roadway floor heave is discussed; on the basis of the study of large range of rock mass around the roadway, the factors resulting in its floor heave are analyzed, as well as the form and the developing process of its floor heave are discussed; the components of the floor heave deformation are interpreted according to the Roadway Support Theory Based On Broken Rock Zone, and the floor heave deformations which arise from such factors as the elastic and plastic deformation, the rock dilatancy, and the swelling deformation result from rock meeting with water, are estimated through theoretic computation or experimental formulas; two mechanical models accounting for the structure expansion of rock peak-residual deformation are put forward; and the roadway floor heave deformation brought about by rock creep is theoretically analyzed; thereby the mechanism of the serious floor heave of the roadway is profoundly exposed. In the thesis, the approaches and proper methods of controlling the roadway floor heave are brought forward; the control schemes put forward are composed of floor grouting and reinforcement with both sidewall-bolt and angle-bolt, whole section grouting and reinforcement with both sidewall-bolt and angle-bolt, as well as whole section bolting-grouting; using the Universal Distinct Element Code, the roadway floor heave deformation in such supportingconditions as naked roadway, the original supporting scheme, reinforcement with both sidewall-bolt and angle-bolt-no grouting, and the above-mentioned three schemes is computed; the surrounding rock plastic zone and stress distribution around the roadway in the above-mentioned supporting condition is analyzed; the situation of both the cable axial stress distribution and its failure before grouting is compared with that after grouting; why the original supporting scheme did not prevent the roadway floor heave is discussed; and the effectivity of the supporting method of whole section grouting combining with both sidewall-bolt and angle-bolt is analyzed. The supporting project has successfully been put into practice, vast economic profit and technological effect has been achieved, as well as a good method to control the floor heave of similar roadway has been given.