泰安煤矿8101工作面导水裂隙演化规律

Evolution Laws of Water Flowing Fractured Zone Height at 8101 Working Face in Tai'an Coal Mine

为研究泰安煤矿8101工作面采空区上覆岩层导水裂隙演化规律，采用UDEC建立力学模型，模拟工作面自切眼至充分采动过程中上覆岩层导水裂隙的发育过程，并利用单端堵水试验法对导水裂隙发育高度进行现场实测。研究结果表明：工作面推进过程中，采空区导水裂隙的发育有一定范围，达到充分采动后不会随着工作面的推进向上发展。同时，随着工作面推进，在工作面前方和切眼后方形成存在应力增高区，应力峰值出现在距离煤壁4-10in范围内；在工作面和切眼煤壁附近上方形成应力降低区，该区域内存在丰富的次生裂隙，也是导水裂隙发育最高的区域。此外，利用单端堵水试验法实测采空区导水裂隙高度与数值模拟结果基本吻合，是一种有效可行的方法。

In order to study the evolution laws of water flowing fractured zone height at 8101 working face in Taian Coal Mine, we use UDEC to build mechanical model to simulate the development process of overburden water flowing fracture during the mining process from face to open - off cut, and use one terminal plugging method to measure the height of water flowing fractured zone. The results show that the height of water flowing fractured zone has a certain range with the advancing of caving face, and will stop upward develop- ment when reach to full extraction. Meanwhile, there is always stress increased area in the front of caving face and rear of open - off cut, the distance of maximum stress from the coal wall is 4 to 10 m. There is low ground stress region around the caving face and open - off cut and rich secondary interstice, which is the highest region of water flowing fractured zone, the more interstice developed. Fur- thermore, the result of the height of water flowing fractured measured by using the method of one terminal plugging basically consistent with the results of numerical simulation, so it is a effective and feasible method.