Simulation of the fault zone and floor grouting with an analysis of the waterproof in mining practice
As is known,with the extension of the mining depth,the mining hydrogeological condition has been becoming more and more controversial.Among them,the biggest problem is the direct consequence affecting the safety production of the mine due to the floor water inrush in the fault zone by the working face.While considering the influence by the crack interaction between the fault zone and working face floor to the water inrush,with the mining stope,grouting waterproof measures have been adopted to the 9603th working face and the fault zone.In order to accurately analyze the effect of the grouting technique,the elastic-plastic constitutive model and Drucker Prager criterion have been introduced into the ANSYS numerical software.Analyzing the area of the strain distribution along the working face under different forward distances with the pre-and-post working face floor and fault zone being grouted.The results show that as a general rule,the area of the strain has been extending gradually with the advancement of the working face,the interaction between the working face floor and the fracture faults has been becoming stronger and stronger,with the strain distribution on the both sides of the excavation of the coal seam and the fracture faults.And,then,the preliminary interaction of the crack between the working face and the fault zone would take place when the working face moves on by 80 meters,and the full interaction would occur when the working face moves to 100 meters.In addition,the elastic modulus of the fault rock would have been greatly reduced before and after the unavoidable grouting,due to the enhancement of the tensile strength and the effect of the solidification slurry.And,consequently,the preliminary interaction would also result in when the working face moves on by 120 meters,which would enact the comprehensive interaction when the working face moves by 150 meters.That is to say,the confined water conservation conditions and the floor permeability,plus the geological structure characteristics,are all likely to turn into the basic factors impacting the water inrush of the 9603-th working face simultaneously,all of which may constitute the decisive factor or factors to determine the grouting waterproof parameters,which help to extract more 50 meters fault pillar on account of the great idealistic effect by the grouting waterproof and contribute to the increase of the economic benefit of the recovery extraction of the mine.
NETL
NSTL
万方数据
维普
