高应力条件下的煤岩钻孔喷孔实验研究

来源 :36届国际采矿岩层控制会议 | 被引量 : 0次 | 上传用户:weihome
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
为了研究高应力条件下的煤岩体动力显现特征规律,运用钻孔喷孔实验系统进行了不同载荷作用下的钻孔喷孔实验,测试并分析了煤试样在实验过程中的应力、应变、钻屑量、声发射等参数.结果表明:只有当加载压力超过某一临界值后,才会发生钻孔喷孔现象;加载压力越大,煤试件的钻屑量越多,钻孔喷孔次数越多,喷孔时伴随有较大煤岩颗粒喷出;同时,钻孔喷孔是一个能量瞬间释放的过程,侧向应力和声发射信号都随之瞬间骤变.实验结果有效揭示了钻孔喷孔过程.
其他文献
我国近距离煤层群分布广泛,近距离煤层的开采与单一煤层开采相比,其矿压显现规律、顶板覆岩运动特征都有显著区别.当两煤层间距较小时,上煤层开采形成的采空区必然会对下煤层工作面造成显著影响,导致下煤层工作面顶板管理困难,矿压显现规律异常.本文以乌达矿区五虎山煤矿10号煤层为主要研究对象,通过查阅文献、建立力学模型等进行分析,得出煤层顶板有效控制受煤层间距、顶板破碎等因素的影响.通过研究破碎顶板研究的现状
大断面巷道支护技术的发展取得了长足的进步,但是在大型综放面开切眼与顺槽巷道连接的交叉点处由于巷道顶板悬空面积增大,给围岩控制带来了安全与技术难题.针对神东集团布尔台煤矿的现场生产地质条件,详细分析交叉点处原有支护设计方案存在的问题并提出支护方案的改进方向,然后在原有开切眼和顺槽支护设计方案的基础上提出了保护交叉点处顶板安全的新联合支护对策,在现场应用的结果表明新方案取得了安全高效的效果.
With the exploitation of coal resources, rockburst and other mining dynamic disasters seriously affects the safety production of coal mine.The occurrence of rockburst is associated with the surroundin
By taking the non-adaptable coal seam as the condition for mining the protective seam, the gas control plan is put forward with the soft rock seam selected as the protective seam for mining.By turning
Coal and gas outburst is a transient but vigorous process of energy release.Studies in the field mainly focus on the law of high-energy gas release at the beginning of a coal outburst.Yet, in the prev
Ground instability, such as roof and rib failures, can lead to damages to equipment, physical injuries of personnel, and some fatalities every year.Despite various advances in drilling and ground supp
Based on a large amount of site statistics in Shenfu mine area, combining with physical simulation and theoretical analysis, the roof weighting features of shallow buried seams group are revealed, and
It is significant task for steeply inclined extra thick coal seam with variable dip angle to develop the technical mining.Comprehensive methods of in-situ testing, creating physical simulation model a
运用自行设计的含锗单晶的含瓦斯煤解吸过程红外热像测量实验系统,从工程热力学角度出发对含瓦斯煤解吸过程温度变化进行了理论分析与实验研究.对含瓦斯煤解吸过程进行了热力学与能量耗散规律分析,分析结果表明,含瓦斯煤解吸过程伴随有煤体温度的降低,它是瓦斯气体膨胀吸热与解吸吸热共同作用的结果;在基于煤体瓦斯解吸方程的基础上建立了含瓦斯煤解吸过程温度—解吸量(△T—Qt)模型;根据实验结果对多变指数n进行了实验
In order to realize the construction of the first large diameter lifesaving vertical surface hole in China, main technologies and arts of large diameter borehole and large diameter lifesaving hole at