The water-filled karst cave in karst area as the disaster source is the energy storage structure of water and mud inrush disaster. Under the strong disturbance and high water pressure of blasting excavation, the water-bearing cracks in the rock mass between the disaster source and the tunnel face evolve to form water inrush channels, resulting in major disasters. In this paper, according to the type of water inrush caused by progressive failure of water-resisting rock mass, the outburst prevention structure is divided into disturbance failure zone, seepage failure zone and spallation failure zone. Based on the theory of rock mass mechanics, fracture mechanics and explosion mechanics, the water–rock interaction mechanism of drilling and blasting tunnel is analyzed, and the calculation method of minimum safety thickness of outburst prevention structure is established. Through the example verification of 2 # pressure pipeline project of Dagangshan hydropower station cavern group, the minimum safety thickness of anti-outburst structure in water inrush project is determined to be 5.25 m.

中文翻译：

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爆破威力与水压耦合作用下岩溶隧道防突水最小安全厚度研究


作为灾源的岩溶区充水溶洞是突水、突泥灾害的能量储存结构。在爆破开挖的强烈扰动和高水压作用下，灾源与掌子面之间岩体的含水裂隙演化形成突水通道，造成重大灾害。本文根据防水岩体渐进破坏引起的突水类型，将防突结构分为扰动破坏区、渗流破坏区和剥落破坏区。基于岩体力学、断裂力学和爆炸力学理论，分析了钻爆隧道水岩相互作用机理，建立了防突结构最小安全厚度计算方法。通过大岗山水电站洞室群2#压力管道工程实例验证，确定突水工程防突结构最小安全厚度为5.25 m。