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http://dx.doi.org/10.9711/KTAJ.2019.21.4.561

Effect of RMR and rock type on tunnel drilling speed  

Kim, Hae-Mahn (Dept. of Civil, Environmental, and Architectural Engineering, Korea University)
Lee, In-Mo (Dept. of Civil, Environmental, and Architectural Engineering, Korea University)
Hong, Chang-Ho (Dept. of Civil and Environmental Engineering, KAIST)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.21, no.4, 2019 , pp. 561-571 More about this Journal
Abstract
Drilling and charging of the blast holes during NATM tunneling works take more than 30% of construction time among the whole tunneling work process. Prediction of ground condition ahead of tunnel face has been studied by several researchers by correlating percussion pressure and drilling speed during tunneling work with the ground condition and/or RMR values. However, most of the previous researches were conducted in the granite rock condition which is the most representative igneous rock in the Korean peninsula. In this study, drilling speeds in igneous rocks were analyzed and compared with those in sedimentary rocks (most dominantly composed of conglomerates, sandstones, and shales) under the similar RMR ranges; it was identified that the drilling speed is pretty much affected by rock types even in a similar RMR range. Under the similar RMR values, the drilling speed was faster in sedimentary rocks compared with that in igneous rock. Moreover, while the drilling speed was not much affected by change of the RMR values in igneous rocks, it became faster in sedimentary rocks as the RMR values got lower.
Keywords
Drilling speed; RMR; Igneous rock; Sedimentary rock;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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