Correlation of model tunnel boring and drilling machine performances with rock properties

Predicting the performance of large diameter circular saws based on Schmidt hammer and other properties for some Turkish carbonate rocks

“…The abrasiveness and hardness of rock are very important to predict the sawability of large diameter circular saws. Aleman [46], Howarth et al [47], Howarth [48], and West [49] are among the researchers who published the papers to point out the importance of these properties in excavation engineering. This study indicates that there is no significant relationship between CAI and SHH 1 , and SHH 2 .…”

A new approach for applying the in-situ Schmidt hammer test on a coal face

“…Schmidt hammer rebound values were found to be a good indicator of rock compressive strength and rock geological discontinuities [11]. Some researchers found strong correlations between the Schmidt hammer value and the cutting rate of roadheaders and tunnel boring machines (TBM), and also mine roof classification [39][40][41][42][43][44][45]. However, the approaches that have been developed for determining optimum test numbers on rock faces were different from each other and inadequate.…”

Performance Evaluation of Button Bits in Coal Measure Rocks by Using Multiple Regression Analyses

“…He also established analytical relationships between annular velocity and these factors. Howarth et al (1986) monitored the performances of a tunnel boring machine (TBM), and diamond and percussion drilling machines. They figured out meaningful relationships by correlating the penetration rate of the machines with some physical and mechanical properties of sedimentary rocks.…”