摘要
采用支架压力在线监测、微震监测、工作面上隅角瓦斯涌出监测等手段,研究了宽沟煤矿B2煤层首采综放工作面坚硬顶板矿压显现特征及控制问题。结果表明:首采综放工作面初次来压步距达到62.2 m,工作面中上部来压剧烈,下部顶煤冒放性差,采用巷道超前深孔预裂爆破不能有效解决坚硬顶板问题,由此实践了工艺巷深孔预裂爆破弱化坚硬顶板,工艺巷爆破后,围岩活动剧烈程度明显降低,周期来压步距由28 m降低至17.8 m,有效解决了坚硬顶板带来的安全隐患问题。
Taking on- line support pressure monitoring,microseismic monitoring,working face top corner gas emission monitoring and other methods,we study roof behavior characteristics and control of B2 coal seam at the first fully mechanized caving face in Kuangou Coal Mine. The results showed that the first weighting interval of the main roof was 62. 2 m,and upper part of working face pressure was more severe,coal caving property in the lower part of working face was poor,the lower part of the face by use of the roadway ahead of deep hole presplitting blast can not effectively solve the problem of hard roof,thus the practice of roadway blasting methods craft softening hard roof,after blasting process significantly reduced the intensity of the activities surrounding rock,weighting interval of working face was decreased from 28 m to 17. 8 m,it was effective solution to safety problems caused by the hard roof.
出处
《煤矿安全》
CAS
北大核心
2015年第12期140-143,共4页
Safety in Coal Mines
基金
国家自然科学基金资助项目(51304116)
天地科技开采设计事业部青年创新基金资助项目(KCSJ-QNCX-2014-09)
天地科技创新基金资助项目(KJ-2014-TDKC-05)
关键词
综放工作面
坚硬顶板
工艺巷爆破
支架压力
微震监测
fully mechanized caving face
hard roof
process roadway blasting
support pressure
microseismic monitoring
