采动巷道应力场环境特征与冒顶机理研究

发布时间：2019-06-12 08:33

【摘要】：针对采动巷道围岩变形剧烈、冒顶事故频发等问题,以保德矿回采巷道为工程背景,综合现场测试、数值模拟、理论分析和顶板探测等方法,从巷道围岩主应力大小、比值和方向3个因素研究分析了采动巷道应力场环境特征,并以巷道蝶形塑性区理论为主线,揭示了采动巷道应力场环境特征与冒顶的内在联系。结果表明:采动空间不同位置的围岩主应力大小、比值和方向具有明显差异,保德矿工作面侧方10~50 m范围内,主应力比值可达2~5,主应力方向的偏转角度可达26°~54°,主应力比值的升高与方向的大幅度旋转导致该区域巷道围岩塑性区呈现蝶叶偏向顶板的蝶形特征,造成其顶板塑性破坏深度较大,当支护不能承受蝶叶内围岩巨大的膨胀压力和强烈变形时,巷道便发生蝶叶型冒顶。
[Abstract]:In order to solve the problems of violent deformation of surrounding rock and frequent occurrence of roof falling accidents in mining roadway, the environmental characteristics of stress field in mining roadway are studied and analyzed from three factors, such as principal stress size, ratio and direction, taking the mining roadway as engineering background, comprehensive field test, numerical simulation, theoretical analysis and roof detection, and the theory of butterfly plastic zone of roadway is taken as the main line. The internal relationship between the environmental characteristics of stress field and roof fall in mining roadway is revealed. The results show that the principal stress, ratio and direction of surrounding rock in different positions of mining space are obviously different. The principal stress ratio can reach 2 鈮，

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