Research Of Strength Weakening Mechanism And Supporting Parameters Optimization In Deep Mining With Fissure Water

In recent years, with the increasing depth of coal mining, underground geologicalenvironment has become increasingly complex, especially high stress accompanied by a largearea of roadway watering, with rock tunnel boring will experience dehydration-absorbingwater-dehydration the continuous cycle, the degree of re-fractured rock this cycle, the physicalproperties of strength will change accordingly, and further lead to changes in stress environment,if timely support and reinforcement measures are not carried out the tunnel large deformationwill occur, even roof fall. Therefore, to weaken the strength of fissure water tunnel roofreinforcement mechanism and supporting research, science and engineering has an importantmeaning.For full Zhuang Chen typical fracture watering mine roadway roof conditions, the rockscene of coal samples were taken for determination of physical and mechanical parameters,deep fracture water of water on sandstone roof roadway physical parameters of the physical andmechanical experiments and in-situ stress measurement, etc. conditions of mechanical systems.Found that the maximum horizontal stress mine roadway become a major factor in themechanical instability and failure, and then contains a high osmotic pressure of the rock, itsinternal stress state and strength has changed, subject to the same osmotic pressure of rock, itswith the rise of rock stress intensity increases; then fixed in rock stress environment, has led toincreased osmotic pressure drop rock strength.Basic knowledge of the application of elastic-plastic theory, the radius of the circulartunnel simplification and displacement plastic zones under effective support fissure waterconditions were simulated demonstration of the impact and found the radius and displacementunder the action of water over the dry state roadway plastic zone increases, and analyzes havebeen fractured radius and displacement water of roadway plastic zone and in-situ stress,supporting the strength of the original infiltration of water pressure, water pressure variation coefficient and the effective cohesion between. Exploration and drilling site COMSOL3.5amulti-field coupling numerical simulation, a detailed study of roof strength weakening law,found under the action of water during the3206excavation Roof stable crack growth is stillexpanding, and the roof with rock subsidence water rate increases gradually become larger, thusrevealing the rich water tunnel roof strength weakening of the basic principles and laws.Physical characteristics and mechanical properties before and after the fracture watertunnel roof water, rock and roof water directly to the top layers of occurrence based simulationstudy, FLAC got rich water tunnel roof bolting the main technical parametersAnd based on the weakening of the roof provides the evolution experiment, the roof hasproposed measures to control the hydrophobic and rock reinforcement measures3206tape Lane.Research in the field of applied research, technology and achieved good economic results.