【摘要】：針對(duì)采動(dòng)巷道圍巖變形劇烈、冒頂事故頻發(fā)等問(wèn)題,以保德礦回采巷道為工程背景,綜合現(xiàn)場(chǎng)測(cè)試、數(shù)值模擬、理論分析和頂板探測(cè)等方法,從巷道圍巖主應(yīng)力大小、比值和方向3個(gè)因素研究分析了采動(dòng)巷道應(yīng)力場(chǎng)環(huán)境特征,并以巷道蝶形塑性區(qū)理論為主線,揭示了采動(dòng)巷道應(yīng)力場(chǎng)環(huán)境特征與冒頂?shù)膬?nèi)在聯(lián)系。結(jié)果表明:采動(dòng)空間不同位置的圍巖主應(yīng)力大小、比值和方向具有明顯差異,保德礦工作面?zhèn)确?0~50 m范圍內(nèi),主應(yīng)力比值可達(dá)2~5,主應(yīng)力方向的偏轉(zhuǎn)角度可達(dá)26°~54°,主應(yīng)力比值的升高與方向的大幅度旋轉(zhuǎn)導(dǎo)致該區(qū)域巷道圍巖塑性區(qū)呈現(xiàn)蝶葉偏向頂板的蝶形特征,造成其頂板塑性破壞深度較大,當(dāng)支護(hù)不能承受蝶葉內(nèi)圍巖巨大的膨脹壓力和強(qiáng)烈變形時(shí),巷道便發(fā)生蝶葉型冒頂。
[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，

本文編號(hào)：2497877