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SOIL  SAMPLING
TAGGING   SAMPLES

Engineering Aid 3 - Beginning Structural engineering guide book
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Table 15-2.-Methods of Underground Exploration and Sampling Common name of  method Auger boring Well drilling Rotary  drilling Test pits Materials in which used Cohesive  soils and  cohesion- less  soils  above groundwater elevation All soils, rock, and  boulders All soils, rock, and  boulders All  soils.  Lower- ing  of  ground- water may be necessary Method of advancing  the  hole Augers  rotated  until filled with soil and then removed to surface Churn drilling with power  machine Rotating  bits  operat- ing in a heavy circulating  liquid Hand digging or power  excavation Method of Value  for sampling foundation   purposes Samples  recovered from  material brought  up  on augers Bailed  sample  of churned  material or  clay  socket Samples  recovered from  circulating liquid Samples  taken  by hand  from  orig- inal position in ground Satisfactory for high- way  exploration  at shallow  depths Clay  socket  samples are dry samples Bailed samples are valueless Samples are of no value Materials can be in- spected in natural condition  and place Figure  15-3.-Sketch  showing  locations  of  soil  exploration  points. 15-8







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