采动应力诱发的动力灾害是制约急斜特厚煤层群安全开采的难题之一。以乌鲁木齐矿区乌东煤矿动力灾害防控为目标,采用开采技术条件调查、理论分析、数值计算和现场监测等方法与手段,揭示采动应力畸变致诱动力灾害机理。研究表明:43号煤...采动应力诱发的动力灾害是制约急斜特厚煤层群安全开采的难题之一。以乌鲁木齐矿区乌东煤矿动力灾害防控为目标,采用开采技术条件调查、理论分析、数值计算和现场监测等方法与手段,揭示采动应力畸变致诱动力灾害机理。研究表明:43号煤层产生的采动应力经其顶煤传导作用至层间夹持煤岩柱(sandwiched coal-rock pillar in seams,SCPS),同时受自重作用SCPS发生大变形,造成其倾向上部层位受拉伸应力而倾向下部层位受压缩应力,引发45号煤层+575水平南巷顶板应力高度集中,导致动力灾害频发。针对43号煤层工作面高于45号煤层工作面的开采布局,制定"先注水后爆破"解危措施。现场监测结果表明微震大事件频率由4.0次/min降至1.0次/min,电磁辐射峰值强度降至42.8 m V,动力灾害得到有效控制。展开更多
Based on the elastic plate theory, a mechanical model of thin plate for the first caving of overlying roof rock in steep mining face was established. The analytical solution of the deflection and stress distribution o...Based on the elastic plate theory, a mechanical model of thin plate for the first caving of overlying roof rock in steep mining face was established. The analytical solution of the deflection and stress distribution of roof rocks was obtained. According to the specific geological conditions of the 5-103 panel in Shanxi,the failure of roof rocks and the influence of seam dip on it during the exploitation were theoretically investigated. Meanwhile, the first caving characteristics of the overlying rock in the steep coal seam were investigated based on its stress contour. The results show that the dip angle has a distinct influence on the caving interval and the first caving interval for the 5-103 panel is 37 m in theory. Finally, a systematic monitoring on the behavior of rock pressures was conducted. The measured results agree well with the theoretical prediction, which provides a good reference for practical steep coal seam mining.展开更多
文摘采动应力诱发的动力灾害是制约急斜特厚煤层群安全开采的难题之一。以乌鲁木齐矿区乌东煤矿动力灾害防控为目标,采用开采技术条件调查、理论分析、数值计算和现场监测等方法与手段,揭示采动应力畸变致诱动力灾害机理。研究表明:43号煤层产生的采动应力经其顶煤传导作用至层间夹持煤岩柱(sandwiched coal-rock pillar in seams,SCPS),同时受自重作用SCPS发生大变形,造成其倾向上部层位受拉伸应力而倾向下部层位受压缩应力,引发45号煤层+575水平南巷顶板应力高度集中,导致动力灾害频发。针对43号煤层工作面高于45号煤层工作面的开采布局,制定"先注水后爆破"解危措施。现场监测结果表明微震大事件频率由4.0次/min降至1.0次/min,电磁辐射峰值强度降至42.8 m V,动力灾害得到有效控制。
基金financially supported by the National Natural Science Foundation of China (Nos. 51374197 and 50774078)the National Basic Research Program of China (No. 2015CB251600)+1 种基金the University Discipline Construction Project of Jiangsu Province, Blue Project of Jiangsu Provincethe Open Foundation of State Key Laboratory of Coal Resources and Sage Mining (No. SKLCRSM12X06)
文摘Based on the elastic plate theory, a mechanical model of thin plate for the first caving of overlying roof rock in steep mining face was established. The analytical solution of the deflection and stress distribution of roof rocks was obtained. According to the specific geological conditions of the 5-103 panel in Shanxi,the failure of roof rocks and the influence of seam dip on it during the exploitation were theoretically investigated. Meanwhile, the first caving characteristics of the overlying rock in the steep coal seam were investigated based on its stress contour. The results show that the dip angle has a distinct influence on the caving interval and the first caving interval for the 5-103 panel is 37 m in theory. Finally, a systematic monitoring on the behavior of rock pressures was conducted. The measured results agree well with the theoretical prediction, which provides a good reference for practical steep coal seam mining.
