摘要
顶板岩层垮落带与导水断裂带高度的划分,是进行瓦斯抽采及"三下"采煤等煤矿安全分析的重要影响因素。运用UDEC数值模拟软件,模拟赵庄煤矿3304综采工作面采动过程;结合岩层破断的理论分析,依据模拟结果中煤层顶板破坏特征及位移场的变化规律,确定受采动影响造成的顶板岩层垮落带与导水断裂带最大高度位置。结果表明:不同高度顶板岩层的最大下沉值随着顶板与煤层之间距离的增加而逐渐减小,直至基本稳定不变;通过分析煤层上方不同高度顶板岩层最大下沉值的变化规律,获得顶板岩层垮落带与导水断裂带高度分别为21.2 m和76.7 m,而现场分析结果为25.15 m和78.19 m,与数值模拟结果接近。
The division of the height of the caving zone and the water flowing fractured zone in roof rock strata is an important influence factor for the safety analysis of gas drainage and coal mining under buildings,railways and water- bodies.In this paper,the mining process of 3304 working face in Zhaozhuang Mine was simulated with UDEC numerical simulation software; the location of the maximum height of the mining- induced caving zone and water flowing fractured zone in the roof rock strata was determined according to the theoretical analysis of rock breakage,the roof failure characteristics and the change rule of the displacement field. The results showed that the maximum convergence value of the roof rock strata in different height gradually decreased with the increase of the interval between the coal seam and roof until it kept constant. By analyzing the change rule of the maximum convergence value of roof rock strata in different height above the coal seam,the height of the caving zone and the water flowing fractured zone was obtained,they were 21. 2 m and 76. 7 m respectively; the field measuring results were 25. 15 m and 78. 19 m respectively,they were very close to the numerical simulation results.
出处
《矿业安全与环保》
北大核心
2015年第4期21-24,共4页
Mining Safety & Environmental Protection
关键词
UDEC
垮落带
导水断裂带
下沉值
UDEC
caving zone
water flowing fractured zone
convergence value
