Evaluation of Fragments from Disc Cutting of Dry and Saturated Sandstone

As the use of mechanical excavation in tunneling and mining activities expands, so has the use of disc cutters in various ground conditions. The impact of moisture content on rock behavior and rock excavation by disc cutters is examined in this study. This was done through a series of full-scale cutting tests using a 292 mm (11.5 in.) disc cutter in a moderate strength sandstone. The muck from the cutting tests was used to determine coarseness index (CI) and absolute size constant (x′). x′ was calculated using Rosin–Rammler distribution (or Weibull) curve, a statistical technique to look at the fragmented rock products. This approach is very popular among the mineral-processing professionals for the evaluation of the particle sizes of the comminution products. x′ and CI show a reasonable correlation with the specific energy of cutting and production rate. Both of these indicators were found to be dependent on the cut spacing and the interaction between the adjacent cuts, as anticipated. This paper explains the background information on this topic, reviews the laboratory testing, and offers analysis of the results of grain size distribution and its relationship with specific energy and cutting geometry. It should be noted that the experimental program was limited to only one rock type and additional testing on the other rock types is required to expand the results of the current study.

[1]  Jamal Rostami,et al.  Performance prediction: a key issue in mechanical hard rock mining , 1995 .

[2]  Yong-Joo Lee,et al.  Causes of reduction in shield TBM performance – A case study in Seoul , 2011 .

[3]  Priscilla P. Nelson,et al.  10 – TBM Performance Analysis with Reference to Rock Properties , 1993 .

[4]  M. Z. Abu Bakar,et al.  Saturation Effects On Disc Cutting of Sandstone , 2011 .

[5]  J. Rostami,et al.  A New Model for Performance Prediction of Hard Rock Tbms , 1997 .

[6]  R. Altindag,et al.  Estimation of Penetration Rate in Percussive Drilling by Means of Coarseness Index and Mean Particle Size , 2003 .

[7]  R. Altindag.  Evaluation of drill cuttings in prediction of penetration rate by using coarseness index and mean particle size in percussive drilling , 2004 .

[8]  A. Shakoor,et al.  The effect of degree of saturation on the unconfined compressive strength of selected sandstones , 2006 .

[9]  Kurosch Thuro,et al.  Roadheader Excavation Performance - Geological And Geotechnical Influences , 1999 .

[10]  Cemal Balci,et al.  Correlation of rock cutting tests with field performance of a TBM in a highly fractured rock formation: A case study in Kozyatagi-Kadikoy metro tunnel, Turkey , 2009 .

[11]  I. Brezani,et al.  Improving the effectivity of work with Rosin-Rammler diagram by using MATLAB R GUI tool , 2010 .

[12]  Arthur F. Taggart,et al.  Handbook of mineral dressing : ores and industrial minerals , 1945 .

[13]  Işık Yilmaz,et al.  Influence of water content on the strength and deformability of gypsum , 2010 .

[14]  J. Rostami,et al.  Disc cutting tests in Colorado Red Granite: Implications for TBM performance prediction , 2007 .

[15]  Leslie S. Gertsch,et al.  Disc Cutting Tests on Dry and Saturated Sandstone: Muck as a Performance Estimator , 2012 .

[16]  H. P. Sanio,et al.  Prediction of the performance of disc cutters in anisotropic rock , 1985 .

[17]  E. V. Eeckhout,et al.  The mechanisms of strength reduction due to moisture in coal mine shales , 1976 .

[18]  F F Roxborough,et al.  MECHANICAL CUTTING CHARACTERISTICS OF LOWER CHALK , 1973 .

[19]  J. S. Barker,et al.  A laboratory investigation of rock cutting using large picks , 1964 .

[20]  P. Rosin.  The Laws Governing the Fineness of Powdered Coal , 1933 .

[21]  V. Vutukuri.  The effect of liquids on the tensile strength of limestone , 1974 .

[22]  M. Aus,et al.  Tests on the cutting performance of a continuous miner by , 2022 .

[23]  Cemal Balci,et al.  Control of rock cutting efficiency by muck size , 2008 .

[24]  F D Wang,et al.  MECHANICAL TUNNEL BORING PREDICTION AND MACHINE DESIGN , 1979 .

[25]  A. B. Hawkins,et al.  Sensitivity of sandstone strength and deformability to changes in moisture content , 1992, Quarterly Journal of Engineering Geology.

[26]  R. Fowell.  7 – The Mechanics of Rock Cutting , 1993 .

[27]  D. S. Yan,et al.  Mineral Processing Design and Operation: An Introduction , 2006 .

[28]  I. Smith,et al.  Correlation of rock properties and the cutting performance of tunnelling machines , 1977 .