Study On Compound Floor Heave Mechanism And Control Technology Of Soft Rock Roadway In Pan Yidong Coal Mine

Floor heave is an important feature of strata behaviors in soft rock roadway,this problem is particularly prominent in deep wells. Take west wing2#trackcross-cut in Pan Yidong coal mine of Huainan mining area for example, the paperused four methods which are theoretical analysis, numerical analysis,industry andlaboratory experiment, further study compound floor heave feature, proposedtargeted control technology and applied to engineering practice of soft rock roadwayin Pan Yidong coal mine,the main conclusions are as follows:(1)Based on field measurement obtained distribution of rock stress field of2#orbital cross-cut, measured the rock mechanical properties of the cross-cut floor,obtained the rock composition of cross-cut floor through the X-ray diffractionexperiment;(2)Through the theoretical analysis, put the roadway floor classified as shearslip-materialized expansion compound floor heave of west wing2#track cross-cutin Pan Yidong coal mine. Studied colloidal swelling deformation mechanism ofcross-cut floor,formed the basic control measures of floor physical and chemicalexpansion; based on the floor heave mechanics，studied shear slip deformationmechanism of cross-cut floor,established mechanical model of shear slip floorheave,revealed the formation process of shear slip floor heave,deduced the minimumsupport load calculation formula of control shear slip floor heave,proposed controlmeasures of shear slip floor heave;(3)Using numerical simulation software FLAC3D, studied different sidepressure coefficient on the floor heave of cross-cut, provide reference of cross-cutlayout direction and conducted numerical simulations which are floor heave amount,stress distribution,the distribution of plastic zone under different support conditionsin the same side pressure coefficient;(4)Proposed series of floor control key technologies including the anchor cablebeam,hollow grouted anchor cable in soft rock roadway, applied to the industrialexperiment of west wing2#track cross-cut in Pan Yidong coal mine, showed wellmaintained of cross-cut floor by mine pressure observation, maintained a long-termstablity of floor rock.