摘要
随着我国煤炭主产区西移,西部薄基岩、特厚煤层等复杂地质采矿条件导致工作面端头围岩变形严重、巷道超前支承压力增大、资源回收率低等一系列问题,西部资源开采端头围岩变形机理研究已成为行业的重大需求之一。基于不连沟煤田地质条件,建立相似模拟试验模型,结合摄影量测方法,对西部特殊地质条件下端头围岩变形和区段煤柱稳定性进行深入研究,分析端头放煤距离对端头围岩和区段煤柱变形破坏及应力分布特征的影响规律。研究表明:当端头有3架以上宽度顶煤未放出时,基本顶形成悬顶结构,其中顶煤剩7架、5架、3架未放时,基本顶回转角度分别为9°,22°和12°;端头顶煤全部放出时,基本顶破碎,端头上方顶板结构向采空区发生逆向回转,较大程度改善区段煤柱的应力状态;3架宽度顶煤不放出时,端头围岩应力较大,端部顶煤全放出时,端头围岩应力较小。相关研究成果在F6203综放工作面成功实施,效果显著。
With Chinese coal production moving to ditions, such as thin bedrock, super-thick coal seam, western area, the complex geological mining con- etc, lead to a series of problems including serious deformation of ending of surrounding rock, enlargement of abutment pressure of roadway, low recovery ratio. Research on deformation mechanism of ending of surrounding rock in western mining fields in China has become one of the major industrial needs. Based on the geological conditions of Buliangou coal field, the similar simulation test model combining with the digital camera measurement method is used to study the deformation of ending of surrounding rock and stability of coal pillar. The influence of caving distance in ending on the deformation and stress distribution of the surrounding rock and section coal pillar is analyzed. The results show that： When the distance is over the 3 width of shield and the top coal not released, the basic roof could could form the suspension structure. Especially, when top coal leave 7, 5, 3 width of shield with no discharging, the basic roof turning angle is 9°, 22°, 12° respect-ively; when all coal in the ending is discharged, the basic roof is broken and the roof structure in the ending is reversed. The stress is decreased. The stress of ending of surrounding rock of leaving 3 shield without discharging could be large. Once the coal is discharged, the stress is small. Related research re- sults has been successful implemented in the F6203 fully mechanized face which shows the remarkable effects.
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2018年第1期94-99,共6页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(51323004
51674250)
深部岩土力学与地下工程国家重点实验室开放基金项目(SKLGDUEK1409)
宿州区域发展协同创新中心开放课题项目(2015SZXTXSKF10)
关键词
薄基岩
特厚煤层
端头围岩
变形机理
thin bedrock
super-thick coal seam
ending of surrounding rock： deformation mechanism
