【作者】 郭东明；

【导师】 杨仁树；

【作者基本信息】 中国矿业大学（北京） ， 岩土工程， 2010， 博士

【摘要】 本文针对深部高应力及人为开掘复杂环境下,遇到地质构造变化诱发的冲击灾害等重大工程实际需要,开展煤岩组合体宏细观破坏试验与理论研究具有十分重要的意义。以湖西矿井深部煤岩为研究对象,采用四种不同倾角(0°、15°、30°、45°)煤岩组合体,进行了不同围压条件下的宏观破坏试验研究,分析了倾角对煤岩组合体强度的影响及煤岩组合体宏观破坏机制；通过实时单轴加载的CT观察及煤岩组合体载荷破坏后的断口SEM图,分析了其不同的细微观断裂模式,获得了随着煤岩组合体交界面倾角的增加,煤岩的断裂机制以局部脆性断裂机制为主,向局部脆性和延性耦合断裂机制转变,再到局部脆性断裂机制为主,并且煤岩体的破坏形式以煤体受剪切破坏为主,向受煤岩体交界面的滑移破坏转变；采用数值分析中的扩展有限元的计算方法,分析了单轴载荷下不同倾角煤岩组合体的破坏特征；通过系统的实验、数值分析及理论研究获得了不同倾角煤岩组合体中的煤、岩交界面对煤岩组合体强度的影响规律,提出了倾斜煤岩体的强度理论模型分析预测方程。更多还原

【Abstract】 In this paper, against to the significant practical project needs such as the impact disasters induced by geological structure change under the complex environment of deep and high stress and man-made dug, it is of great significance to carry on macro and micro failure test and theoretical study on coal combination. With HuXi Mine deep coal as the object of study, using four different angle (0°,15°,30°,45°) combination of coal combination, the author carries on macro failure test in different confining pressures, and makes analysis of the effect on strength of coal combination under different angles and macro failure mechanism of coal combination; Through the uniaxial load by real-time CT observation and failure SEM picture of coal combination after the fracture load, the author analyzes different micro failure patterns, and make the conclusion that, with the increase of angle in interface of coal combination, the failure mechanism of coal combination give the first place to local brittle fracture mechanism, and then change to local brittle and ductile fracture mechanism, then the local brittle fracture mechanism go back to the main mechanism, in addition, the shear failure dominated the failure patterns of coal and rock, and then sliding failure in coal and rock’s interface take the place; The author applies extended finite element method in numerical analysis to analyze the destruction characteristics of coal combination in different angle under the uniaxial load; Through the systematic experiments, numerical analysis and theoretical study, the author gets the law of effect on coal combination strength from coal rock interface in different angle, and proposes prediction equation of the inclined coal strength theoretical model.更多还原