摘要
煤矿工作面巷道顶板悬顶距过长严重威胁着生产安全,采用静态破碎技术处理特殊矿井中的巷道悬顶问题具有一定的优越性。理论分析发现,为达到良好实践效果,应增大钻孔孔径、减小孔距,合理孔距为2a(a为裂纹长度)。经实验得到SCA(静态破碎剂)膨胀压力与孔径及水灰比的关系,结果显示:孔径为40 mm时SCA可产生约85MPa的膨胀压力,完全满足工程应用;最佳水灰比为0.3。运用ANSYS数值模拟SCA破碎煤岩体,验证孔径为40 mm、孔距为800 mm参数下的破碎效果,结果显示效果理想。在现场试验中应用上述参数,显著缩短悬顶距离,为安全生产提供保障。
The hanging arch length of the roof of working face roadway is so long that it threats the safety production of coal mine seriously. Appling the staticcrushing technology to hanging arch length problem is superior to adopting other methods.Through theoretical analysis,researchers find that by enlarging the hole diameter and shortening the hole distance,good practice results can be obtained,and the reasonable hole distance is 2a（ a refers to the length of cracks）. Through experimentation the relationship between SCA（ static cracking agent） expansion pressure and the hole diameter as well as the water cement ratio are obtained,the result shows that when the hole diameter is 40 mm,the SCA technology can generate85 MPa expansion pressure,which fully meets the requirement of engineering application and the optimal water ash ratio is0. 3. ANSYS is applied to simulate the SCA crushing process of coal body and the crushing result is tested when the hole diameter is 40 mm and the hole distance is 800 mm and the result shows that the crushing effect is ideal. Finally those parameters are applied to field test and thus the hanging arch distance is greatly shortened,which guarantee the safety production.
出处
《世界科技研究与发展》
CSCD
2016年第5期979-984,共6页
World Sci-Tech R&D
关键词
静态破碎技术
悬顶距
膨胀压力
数值模拟
static crushing technology
hanging arch length
expansion pressure
numerical simulation
