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TEST PORING AND SAMP TNG PROCEDURES <br />STANDARD PENETRATION - SPLIT SPOON (ASTM D 1586) <br />A 1-3/8" ID, 2" OD steel sampling tube is driven into the soil with <br />140 pound weight falling 30". The number of hammer blows required to <br />drive the sampler 1',after an initial set of ;', is the standard pene- <br />tration test ("N" value). The "N" value is an indication of the strength <br />and compressibility of soil. <br />Split spoon samples normally are taken at intervals of 2k' or 5'. <br />At 2�-' intervals, the depth to contacts between soil layers can be <br />determined to an accuracy of about 1'. At 5' intervals, the depth to <br />contacts between soil layers is determined approximately, and the <br />type of material present between sampling intervals is inferred based <br />on the action of drilling tools. The bore hole is advanced between <br />sampling intervals with a flite auger, or a hollow stem auger, or by <br />rotary drilling. Methods used to stabilize the bore hole include: <br />hollow stem auger, casing, drillien mud, Revert drilling fluid, or <br />a plug of paper at the bottom of the hollow stem auger/casing. <br />AUGER BORINGS <br />An auger is drilled into the soil. The auger is then spun or retracted, <br />and samples are taken at the ground surface or off the auger. Using <br />this method, determination of the depth to contacts between layers <br />normally is approximate only. <br />THIN WALL TUBE SAMPLES (ASTM D 1587) <br />Comparatively undisturbed samples are taken with thin wall tunes which <br />are pushed hydraulically into soil. <br />STATIC CONE TESTS <br />The static cone test entails measuring the force required to push a <br />steel cone penetrometer into soil. Cone diameters are 1-3/4",2%",and Y. <br />The apex angle is 60'. The cone is pushed hydraulically at a rate of k" <br />per second. The static cone bearing pressure, qc, is the total load <br />divides: by the projected end area of the cone. The static cone bearing <br />pressure is an indication of the strength and compressibility of soil. <br />CORING (ASTM D 2113) <br />Coring is done with a diamond or carbide bit on a double tubed barrel. <br />1 3/79 <br />