A new face drilling rig for narrow tunnels and ... - Advanced Mining

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In the interpretation of the screen analysis, the respective portion of screenings is calculated by the total dry matter and converted to the respective screenings. In hydrometer analysis the proportion of weight of the respective grain fraction can directly be determined by the suspension density. The cumulative frequency polygon of the mass fraction is called grading curve. The grading curve is a cumulative frequency polygon, so it is not a distribution in the mathematical sense, although the name “grain size distribution” is often applied in common language use. The demonstration is done in a semi-logarithmic scale. In picture 6 the grading curves of various soils is shown. The steeper a grading curve is, the more homogeneous the soil is. The flatter a grading curve is, the more inhomogeneous the soil is. The blue grading curve of the boulder clay shown in picture 6 describes such an inhomogeneous soil. It consists of particles with grain sizes of approx. 10 mm to smaller than 0,001 mm. If any point is chosen on a grading curve and a parallel line is drawn to the x-coordinate and the ordinate (the red line in picture 7), then the intersection of the horizontal line with the ordinate describes the portion that is smaller than the grain size, which is characterized by the intersection of the vertical line with the x-coordinate. In the shown example of boulder clay, 70% of the grains are smaller than 0.4 mm. With the same system it can be determined that in the same material 30% of the grains are smaller than 0.02 mm (light blue lines). EDUCATION The inclination of the grading curve indicates the homogeneity and in-homogeneity of the soil, respectively. This is of importance for various soil characteristics, such as for example for the compactibility of soil. In terms of numbers the homogeneity and in-homogeneity can be expressed through the coefficient of uniformity U. Term 3: d U = d 6 0 1 0 Hereby d60 and d10 are the grain sizes in mm, with which the cumulative curve intersects the 60%- and the 10%-line respectively. In picture 8 the determination of d60- und d10-values of the boulder clay are demonstrated as examples. Pic. 6: Grading curves [6] Issue 04 | 2010 www.advanced-mining.com 8
EDUCATION Pic. 7: Interpretation of grading curves Pic. 8: Determination of the coefficient of uniformity U, example A Issue 04 | 2010 www.advanced-mining.com 9
Page 1 and 2: www.advanced-mining.com 04 2010 ADV
Page 3 and 4: EDUCATION NEWS & REPORTS alljig ®
Page 5 and 6: Pic. 1: Multi-phase system of the s
Page 7: HYDROMETER ANALYSIS The hydrometer
Page 11 and 12: Hereby the dry solids md are determ
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Page 15 and 16: Basics of Market Review and Require
Page 17 and 18: • Layout an Operation Time: Based
Page 19 and 20: Pic. 2: Technical basic parameters
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Page 25 and 26: [5] Kirschbaum, Martin (1991):Grund
Page 29 and 30: Going underground Experts have been
Page 31 and 32: The future All work was successfull
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Page 35 and 36: Experimental Study In highly abrasi
Page 37 and 38: Results The results of the test acc
Page 39 and 40: Abtrag in mm³ 18 16 14 12 10 8 6 4
Page 41 and 42: Bibliography [1] Uetz, H.: Abrasion
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Page 49 and 50: Characteristic data like active cur
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Global ressources, reserves and pro
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Terms of Trade The three biggest pr
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The single wattmeter method (single
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Results of the measurement Fig. 12
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Bibliography [1] INTERNATIONAL ENER
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Sound power P Sound power P is the
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Table 1: Speed of sound of differen
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Definition of the most important so
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Now, it is enabled the sound power
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Table 6: Example of admissible soun
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Table 7: Example of admissible soun
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In the sound spectrum of constructi
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Table 8: Time change of the third-o
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• Surfaces not directly into cont
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Table 11: Slewing crane - Sum sound
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Issue 04 | 2010 Fig. 24: Comparison
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Fig. 32: Low-noise fan Issue 04 | 2
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HBR 201 electrohydraulic drilling m
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a Hütte type HBR 201 universal dri
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