Table 1 shows the recorded blow counts in an SPT test. A safety hammer with rope...

 

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Table 1 shows the recorded blow counts in an SPT test. A safety hammer with rope and pulley arrangement was used to drive the sampler in a 100 mm diameter borehole. Determine corrected N values, and estimate the internal friction angle of the soil. Water table is at 2 m below the ground level, and the saturated unit weight of the soil is 19.81 kN/m³. Depth/m 6 15 Drilling rod length/m 7 16 No of Blows 1st 6" 2nd 6" 3rd 6" 1st 6" 2nd 6" 3rd 6" 4 8 10 6 12 10 12 Table 1 shows the recorded blow counts in an SPT test. A safety hammer with rope and pulley arrangement was used to drive the sampler in a 100 mm diameter borehole. Determine corrected N values, and estimate the internal friction angle of the soil. Water table is at 2 m below the ground level, and the saturated unit weight of the soil is 19.81 kN/m³. Depth/m 6 15 Drilling rod length/m 7 16 No of Blows 1st 6" 2nd 6" 3rd 6" 1st 6" 2nd 6" 3rd 6" 4 8 10 6 12 10 12