ISBN: 9787564656874 - 复合顶板采动巷道围岩破坏形态与控制技术 (1 Ergebnisse)

paperback. Zustand: New. Language:Chinese.Paperback. Pub Date: 2023-06 Publisher: China University of Mining and Technology Press Most of the mining tunnels are excavated in coal seams. and most of them are composite roofs. close to the disturbance source. resulting in severe deformation of the surrounding rock of the large tunnels. serious failure of the support body. and frequent roof falls. In response to such problems. this book takes the mining tunnels of Nanshan Coal Mine as the engineering background. reveals .…