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4. (a) Briefly define the following: © Desk study (ID) Trial pits (iii) Borehole (iv) Standard Penetration Test (40 mark
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- 4 A Briefly Define The Following Desk Study Id Trial Pits Iii Borehole Iv Standard Penetration Test 40 Mark 1 (60.09 KiB) Viewed 32 times
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4. (a) Briefly define the following: © Desk study (ID) Trial pits (iii) Borehole (iv) Standard Penetration Test (40 marks) (b) A borehole is drilled to a depth of 3.5 m in a sand. The water table was found at a depth of 2.0 m. The unit weight of the sand is 18 kN/m' and the saturated unit weight is 20 kN/m]. During the boring the Standard Penetration Test (SPT) was conducted and the field N-values are given in the table below. The energy ratio for the equipment was reported to be 45. N Depth (m) 1,0 to 1,5 2,0 to 2,5 3,0 to 3,5 9 13 27 (60 marks) You are asked to: () (ii) Estimate the corrected (Niko Derive the value of using the Hatanaka and Uchida (1996) correlation given below. Use the following equations and tables from EC 7) to answer the question: I DT024/3 DT027/3 14990 CIVL 3802 15057 CIVL 3802 (0,020 x2xCwxN 98 CN = Values of the correction factor Cw larger than 2,0 and preferably 1.5 should not be applied $ = 20 (N) +20 (Hatanaka & Uchida, 1996) Table A1-Correction factors in sands due to rod length Radlength Correction factor below the ani -10 to 10 4106 3 to 4 1.0 0,96 0.85 0.75