Experimental Study On The Charge Induction Of Floor Rock Water Bursting Fracture

Water bursting is one of the major coal mine disaster.In recent years,with the increase of mining depth,the coal floor water bursting occurs becomes plus frequent accidents and which serious harm to the national economy and people's lives.When the coal mine accidents wading,the rock deformation and failure release large amounts of information.Including the charge induction signal,charge induction signal reflects the state of deformation and fracture of coal or rock.It can be used as monitoring,forecasting water inrush basis.In the paper,with experimental methods,studying the variation of the charge induction signal of rock mass destruction and destabilization water inrush compression fracture process,which can provide a theoretical basis for monitoring mine water inrush by charge induction.The main work and innovation points in this papet are as follows:(1)The compression,shear,tensile properties of different moisture content rock and the variation curve in failure process were studied.Analysis of obtained,the higher moisture content,the lower strength.The slope of aqueous rock linear elastic phase curve was far less than the dry one when the rocks were compressed destruction.(2)The influence of moisture on the charge induction signal in the deformation and failure process of rock was studied.Analysis of obtained,the charge induction signal intensity of aqueous rock compression failure is stronger than the dry rock.Moreover,with the increase of moisture content the charge induction signal strength showed gradual increasing trend.The charge induction peak signals generally appear before and after the peak stress.(3)The charge induction signal law in the deformation and failure process of sandstone?sandy mudstone and mudstone were studied.Analysis of obtained,three different rock have charge induction signals in the compression failure process.The charge induction signal amplitude of sandstone is higher than Sandy mudstone and mudstone's,the signal decay time is relatively long.The compressive strength of sandstone?sandy mudstone and mudstone in descending order.(4)The different types of rock charge induction signal law in the process of water burst fracture were studied.The result showd that sandstone?sandy mudstone and mudstone all have charge induction signal in the process of water burst fracture,and only appears once a larger charge signal before the sample is completely broken,signals are appear before the pressure reaches a peak.The charge induction signal decay time of three different type rocks were showed descending trend in the process of water burst fracture,the anti-pressure strength in descending order.(5)The charge induction signal law of different thickness of mudstone,sandy mudstone,sandstone in the process of water burst fracture were studied.The charge induction signal decay time of mudstone showed a decreasing trend as the thickness of rock decreases in the process of water burst fracture.The time between charge signal peak and water pressure peak showed a decreasing trend as the thickness of sandy mudstone decreases in the process of water burst fracture.The charge induction signal decay time of sandstone showed a decreasing trend as the thickness of rock decreases in the process of water burst fracture and the time between charge signal peak and water pressure peak showed a decreasing trend as the thickness of sandstone decreases in the process of sudden water damage.(6)The rock fracture water bursting pressure under different axial compression and different types of rock fracture pressure were studied.Sandstone,sandy shale and mudstone fracture pressure descending order.Within a certain range of axial compression,the bursting pressure decreases as axis pressure increases.