Analysis of the mining failure regularity and safety mining of the weak and weathered composite roof;
软弱风化复合顶板采动破坏规律与安全开采分析
The scientized mining technology includes efficient mechanized mining,green mining,safety mining,and mining with high exploitation rate while the scientized mining refers to the one which can realize the coal mining with the highest efficiency on the precondition.
科学采矿是指实现既能最大限度地高效采出煤炭资源而又保证安全和保护环境的开采技术,科学采矿主要包括机械化高效开采、绿色开采、安全开采及提高资源回采率等方面。
Those provide basis for safety mining of coal floor.
从分析煤层底板的裂隙分布出发,建立裂隙岩体的渗流模型,然后应用该模型分析得到的渗流场,采用考虑渗流软化效应的弹塑性有限元方法,分析了煤层开采过程中煤层底板破坏状态,为受煤层安全开采的提供了依据。
The authors introduced the development of China's mining technology of fully-mechanized top-coal caving and clarified fully-mechanized top-coal caving as a productive and safe mining method.
对于高瓦斯煤层进行放顶煤开采,在硬顶煤和硬顶板特殊的地质条件下,必须采取特殊的措施才能安全开采。
The structure and work process of the entire boiling water electric heating were elabrated.
论述了全开水电热开水器的结构和工作过程,给出了全开水电热开水器的原理框图,设计了温度检测和控制电路、液位检测和控制电路、漏电检测和控制电路,系统通过漏电保护和限压阀保证系统的安全,做到了生水与开水完全隔开,保证饮用者接到的是全开水。