rock bolting

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• Rock climbing — History Styles Technique Equipment and protection Grades (difficulty of climb) Terminology Belaying Abseiling …   Wikipedia

• Retro-bolting — Within the rock climbing community, retro bolting is the addition of new bolts to an existing climb. Retro bolting can be contrasted with Rebolting, which is the replacement of existing bolts on a climb with new bolts.There are many ethical… …   Wikipedia

• Coopers Rock State Forest — Coordinates: 39°39′20″N 79°47′16″W / 39.65556°N 79.78778°W / 39.65556; 79.78778 …   Wikipedia

• Discontinuous Deformation Analysis — (DDA) is a type of discrete element method originally proposed by Shi in 1988. DDA is somewhat similar to the finite element method for solving stress displacement problems, but accounts for the interaction of independent particles (blocks) along …   Wikipedia

• coal mining — Coal was very important in the economic development of Britain. It was used as fuel in the factories built during the Industrial Revolution and continued to be important until the 1980s. The main coalfields are in north east England, the north… …   Universalium

• tunnels and underground excavations — ▪ engineering Introduction        Great tunnels of the world Great tunnels of the worldhorizontal underground passageway produced by excavation or occasionally by nature s action in dissolving a soluble rock, such as limestone. A vertical opening …   Universalium

• Drilling and blasting — Before the advent of tunnel boring machines, drilling and blasting was the only economical way of excavating long tunnels through hard rock, where digging is not possible. Even today, the method is still used in the construction of tunnels, such… …   Wikipedia

• Rockfall — For the unincorporated village in the U.S. state of Connecticut, see Rockfall (village). Rockfall refers to quantities of rock falling freely from a cliff face. A rockfall is a fragment of rock (a block) detached by sliding, toppling, or falling …   Wikipedia

• Sudbury Neutrino Observatory — The Sudbury Neutrino Observatory (SNO) is a neutrino observatory located 6800 feet (about 2 km) underground in Vale Inco s Creighton Mine in Sudbury, Ontario, Canada. The detector was designed to detect solar neutrinos through their interactions… …   Wikipedia

• Konkan Railway — Overview Type Regional rail Status Operational Locale Konkan, India Termini Roha Thokur …   Wikipedia

• КРЕПЬ АНКЕРНАЯ — [КРЕПЬ ШТАНГОВАЯ] крепь, состоящая из металлических, реже деревянных или железобетонных стержней, закреплённых в массиве пород для удержания породы от расслоения и обрушения (Болгарский язык; Български) анкерен [прътов] крепеж (Чешский язык;… …   Строительный словарь