Energy required to break rock by percussive drilling

Conference · Mon Jan 01 04:00:00 EST 1973 · Proc. Symp. Rock Mech.; (United States)

OSTI ID:5111671

Hakalehto, K O

Through tunnel boring has found a permanent place in rapid excavation and has given promising results. Percussive drilling and blasting, especially in hard rocks, is still the main excavating method. Advancements in this field are possible and probable. The use of energy in rock breaking is not wholly understood; the progress in this understanding leads to better control and improvements in the whole excavating process. The present study describes the way in which to use actual percussive drilling experiments for the determination of the specific energies in rock fracturing. It is concluded that the penetration rate depends primarily on the energy used to fracture the rock under the drill bit. Though the energy which is transmitted elastically to the rock is generally estimated to be negligible, in some rock types the elastic energy is a considerable amount of the total energy transferred to the rock.

• OSTI ID: 5111671
• Report Number(s): CONF-720602-
• Conference Information: Journal Name: Proc. Symp. Rock Mech.; (United States)
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420206* -- Engineering-- Mining & Drilling Equipment & Facilities-- (1980-1989)
58 GEOSCIENCES
580300 -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
BOREHOLES
CAVITIES
DRILLING
DRILLING EQUIPMENT
DRILLS
ENERGY TRANSFER
EQUIPMENT
EXCAVATION
FRACTURE MECHANICS
MECHANICS
PERCUSSIVE DRILLS
ROCK DRILLING
ROCK MECHANICS
USES