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2Šª
”NF
1992”N
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209-214•Å
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PROCEEDINGS OF TUNNEL ENGINEERING, JSCE
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Akio TAMAI, Hideki SHIRAHATA, Kazumasa NAGAHISA
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EFFECT OF CONTROLLED BLASTING AND THE EVALUATION OF THE INFLUENCE ON ROCK MASS AROUND TUNNEL
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Controlled blasting is generally used for producing a smooth final profile, a minimum of overbreak and a minimum of stressing or fracturing of the remaining rock. It is, however, difficult to evaluate the damage to the rock outside the blasting contour. A series of in-situ tests were conducted in discontinuous rock to investigate the influence on the rock by blasting. According to the test results, it is shown that the effect on rock mass strongly depends on blasting methods. It is also revealed that the physical properties of the damaged rock can be estimated quantitatively by the seismic velocities measured in a borehole.
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