Studies Of Mechanism Using Hydranlic Fracturing To Prevent And Control Of Coal Barsts Caused By Malti-seam Mining Interaction

Coal sean water infusion is a technology to hard dry coal, in under the action of waterpressure and capillary force of the cutting, crack extending, a lot of making originalapproximate rigid coal composed of fractures intersected block, The viscous effect of fissurewater and water molecules adsorption force make the combination block between viscosity,lower stiffness, stiffness degradation, deformation increase. Coal Bed Water Injection HoleDrilling Construction Technology is to deal with hard roof, effective prevention and controlof rock-burst technology way, is the guarantee of a coal mine safety and efficient miningtechnology, has the advantages of safety, environmental protection, efficient and economic.This article mainly USES the physical mechanics test, similar simulation and numericalsimulation mineral pressure observation, the mine pressure observation and field testmethods of the chariot treasure mine own close containing dirt band fully-mechanizedworking face water injection to weaken the prevention and control of rock bursts asystematic research, the main work and results are as follows:(1) By physical and mechanical test of coal and rock compressive strength, shearmodulus, bulk modulus, tensile strength, cohesion, friction within the every Angle and therelationship between the moisture content, different moisture contents are established bylinear regression and the corresponding relation of coal and rock mechanical parameters.(2) Through the chariot treasure to geological data of coal seam occurrence, similarmodel, simulate and close coal seam water injection of the lower coal after mining the uppercoal mining.(3) The measured working face mining pressure value in the process of mining, thestatistics of the trend and tendency of the mine pressure curve distribution, analysis of the formation of "small"-the first weighting and periodic law of mine pressure appear.(4) First of all, the theory to study the influence of the inclination of the impact ofwater injection in coal, and then through the numerical simulation and similarity simulationcompared before and after the stress of coal injection, the plastic zone distribution andfracture development situation, it is concluded that the mechanism of prevention and controlof shock pressure water injection.(5)Is proposed and implemented at close range with a thick top-coal of full-mechanizedcaving mining face advancing water injection weakening technology, optimizing the waterinjection process and parameters.