A new face drilling rig for narrow tunnels and ... - Advanced Mining
A new face drilling rig for narrow tunnels and ... - Advanced Mining
A new face drilling rig for narrow tunnels and ... - Advanced Mining
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HYDROMETER ANALYSIS<br />
The hydrometer analysis is suitable <strong>for</strong> cohesive soil (d<br />
< 0,125 mm). In this analysis the soil sample is mixed with<br />
water to <strong>for</strong>m a suspension <strong>and</strong> poured into a level gauge.<br />
The method is based on the physical property that grains<br />
of various sizes sink with different velocities in st<strong>and</strong>ing<br />
water.<br />
The distribution of the grain sizes <strong>and</strong> as such the density<br />
in the suspension changes with the different velocities<br />
of sinking of the grains. The grain size distribution is<br />
determined through suspension density with the aerometer<br />
EDUCATION<br />
method, which determines the weight portion of the<br />
respective grain fraction. This is done through immersing<br />
the aerometer into the suspension in defined time intervals<br />
<strong>and</strong> reading the immersion depth, which is dependant on<br />
the density. Based on the immersion depth in the defined<br />
times, the density <strong>and</strong> the mass fraction of the various<br />
grain groups can be read from a nomogram.<br />
Picture 5 shows an areometer, which is used <strong>for</strong> the<br />
hydrometer analysis<br />
Pic. 5:<br />
Areometer <strong>for</strong> the hydrometer analysis [7]<br />
Issue 04 | 2010 www.advanced-mining.com<br />
7
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