WebIn strip mining, extraction and backfilling are performed concurrently. Strip mining methods are further subcategorized into two types according to topographic features of a mining site. “Area Mining” is practiced on relatively flat or gently rolling terrain while “Contour Mining” is practiced in areas of hilly topography. WebWhile these four broad types of ground condition require very different methods of excavation and ground support, nearly all tunneling operations nevertheless involve certain basic procedures: investigation, excavation …
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Tunnels and underground excavations - Tunneling techniques
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