中文摘要：

针对神东集团布尔台矿二次釆动回采巷道顶板破裂深度大、变形量严重、冒顶事故频发等问题,采用现场观测、数值模拟试验和理论分析相结合的方法,研究采动巷道顶板变形破坏特征和工程可控性。结果表明：巷道二次采动影响期间顶板变形破坏严重,增加支护强度对顶板变形的控制效果极为有限,顶板下沉量远远超出锚索的承受能力,顶板破裂深度高达4 m左右,在现有技术条件下试图通过高强支护来限制顶板下沉是达不到的,须采用以控制冒顶为主的高延伸率、大锚固范围支护材料。据此,对锚杆接长装置进行了优化设计,并在布尔台矿42105回风巷进行了支护补强试验,试验结果表明优化后接长锚杆支护技术能够有效防止巷道冒顶。

英文摘要：

Aiming at solving the problems of large destruction depth,severe deformation and frequent caving accidentsof argillaceous rock mining tunnel roof, the secondary mining tunnel in Buertai mine was taken for researchbackground, the deformation-failure characteristics and engineering controllability of rock mining tunnelroof were studied and analyzed by combining methods of field observation, numerical simulation and theoreticalanalysis. The results indicate that： during the second-time mining-influence period, the roof deformation andfailure is severe, and the contribution to the control effect of roof deformation by increasing support strength isextremely limited. The roof convergence goes far beyond the anchor cable enduring ability,and the depth of roofrupture is about 4 m. With the existing technology, it is unattainable to restrict roof convergence by highstrength bolting,and it is necessary to take the flexible supporting method which gives priority to the control ofroof caving with sufficient anchorage range. Accordingly,the anchor extension device was designed,and the extension anchor engineering test was conducted. The test results indicate that this technology is able to preventeffectively the tunnel roof caving.