黄陇煤田综放采煤顶板导水裂缝带高度发育特征

为了研究黄陇煤田综采放顶煤（综放）采煤工艺条件下的导水裂缝带高度及其发育规律，系统收集区内各矿井实测数据资料，采用数理统计和回归分析方法研究导水裂缝带高度与工作面宽度、煤层埋深以及采高的相关关系。研究结果表明:工作面宽度小于240 m且煤层采高为8.5~9.5 m时，软弱覆岩裂采比和导水裂缝带高度恒大于中硬覆岩；工作面宽度大于90 m且煤层采高大于14.5 m时，软弱覆岩裂采比和导水裂缝带高度恒小于中硬覆岩。综放软弱顶板裂采比和导水裂缝带高度随采高增大均呈单峰状，裂采比是采高的二次函数，导水裂缝带高度是采高的三次函数。裂采比最大为30.63倍，拐点处采高3.56 m；导水裂缝带高度最大为239.97 m，拐点处采高10.41 m。由拐点向两侧采高分别减小或增大时，裂采比和导水裂缝带高度均逐渐减小。综放中硬顶板裂采比和导水裂缝带高度受工作面宽度和煤层采高的共同影响。在工作面宽度一定时，裂采比随着煤层采高增大而逐渐减小且变化幅度越来越小，大致趋于11.00，14.30]数值区间；在煤层采高一定时，工作面宽度越大裂采比越大。导水裂缝带高度随着工作面宽度和煤层采高增大而增大。 

Characteristics of height of water flowing fractured zone caused during ful-ly-mechanized caving mining in Huanglong coalfield

In order to study the law of height of water flowing fractured zone caused by fully-mechanized caving mining in Huanglong coalfield, this paper has systematically collected the measured data in the region, and methods of mathematical statistics and regression analysis were used to study the relationship among the height of water flowing fractured zone, width of working face, depth of coal seam and height of coal mining. The results show that:When the width of working face was less than 240 m and the height of coal mining was 8.5 to 9.5 m, the height of water flowing fractured zone under the soft stratum was always greater than that under the medium-hard stratum. When the width of working face was greater than 90 m and the height of coal mining was more than 14.5 m, the height of water flowing fractured zone under the soft stratum was always smaller than that under the medium-hard stratum. The height of water flowing fractured zone under the soft stratum and its ratio were both a single-peak curve with a maximum value as the height of coal mining increases. The height of water flowing fractured zone was a cubic function of the height of coal mining, and the ratio was a quadratic function of the height of coal mining. The maximum height was 239.97 m while the height of coal mining was 10.41 m, and the maximum ratio was 30.63 while the height of coal mining was 3.56 m. The height of water flowing fractured zone under the medium-hard stratum was affected by both the width of working face and the height of coal mining. When the width of working face was constant, the ratio of fractured zone height and mining height decreased gradually with the increase of mining height, and the change became more and more smaller, tended approximately to range from 11.00 to 14.30. When the height of coal mining was constant, the ratio increased with the width of working face. The height of the water flowing fracture zone increased with the width of the working face and the height of the coal mining.