Handout5 - 40 Dense 50 Dense to very dense 60 Very dense...

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Standard Penetration Test 1. Performed using split spoon sampler (See Fig. 3.24, p. in Coduto) 2. Sample is driven • 140 lb. hammer • hammer dropped 30" • sampler driven 18" 3. Count the number of blows required to drive first 6", second 6" and third 6". 4. Standard Penetration Resistance, N = # of blows required to drive sampler last 12" of 18" For coarse-grained soils: Value of N Relative condition of soil 10 Loose i 20 . Medium-dense I 30 Medium-dense to dense
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Unformatted text preview: 40 Dense 50 Dense to very dense 60 Very dense See also Table 5.5 in Coduto (2.5111111) L ~ff~~~~~ 1""c<c<,cc<<o"";'",db"",,,,,,7l ~ \ t::z;v/Xijz;h<;\\~ ~,,=\\\\t: 16" to 23", ' , , Vent 0.1 in. .-( ~ .-( ~ Ball 1 to 2 in. 18 to 30 in. (25 to 50mm) (457 to 762mm) Figure 3.24 The SPT sampler (Adapted from ASTM D 1586; Copyright ASTM, used with permission) Area Ratio A rough index of potential disturbance caused by a sampler....
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Handout5 - 40 Dense 50 Dense to very dense 60 Very dense...

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