Numerical Simulation Test & Engineering Application Of Water Inrush From Coal Seam Floor

For a long time, the safe mining of our country's coal resources has been seriously affected by a primary factor which is water inrush from coal seam floor. It is a complicated problem involving several of subjects such as geology, coal mining, rock hydraulics and rock crack mechanics.First, the primary factors including mining pressure, confined water and geologic structure are analyzed in the paper. By analysis, the dominate factors affecting coal seam floor's damage, water inrush channel forming, and water inrush's occurring can be get. And then, utilizing NCAP-2D-W exploited and improved by professor Liu Huaiheng, research on the several of projects of numerical simulating test on the water inrush from coal seam floor is made in this paper. Its main content is such as following:(1) In condition that confined water is unchangeable, different cranny state is designed and the effect which is made by single cranny, multiple cranny, different length cranny on the damage of coal seam floor is discussed. The affect mining pressure on cranny copping is also discussed.(2) In condition that confined water is changing, the two status about single cranny and multiple cranny are respectively took into account and the effect which is made by the cranny and mining pressure on coal seam floor damage is discussed. Through analyzing the numerical test affected by mining load, rock structure movement, cranny distributing state, and confined water movement, the interrelated rule about the expand of damage area, increasing by degree of water inrush's moving height and forming of water inrush channel can be obtained in this paper.At last, combining actual engineering of certain working face in Huai bei Yangzhuang coal mine, numerical simulation on mining process is made and whether water inrush can occur is anticipated. The anticipating result accord with the spot data primly.