Question

Q15. In an SPT test, the numbers of drops, to penetrate 450 mm of the rod into a cohesive soil, have been 5, 6 and 7 for each 150-mm increment. What is the approximate range for the UCS of the soil at that layer?

Answer 1

Solution im SPT test number of drops first Isomm for layer is neglected as it called seating drive amel semaining number of doops for 300mm is Calculated and it is called penetration resistance (N) So Pene fration resistance Ne number of drops for last 300 mm Penetration - 6+7 =13 N and empirical i un contined relationship between Nand compressive strengen) is follows ues ves (Alm) Penetration resistance (N) od 5 do 2.5 5 TO 20 so, ves for N43 is Calculated as Tues=20 tonn usc usu potom Na Nala Nazo

Selo | s sza 2014lony (Elening Nino Naka N2 = 16 ues at (N=13) = Sit (S2-5,) & (u! Ni) si = lot (2010) (B-8) (166) s' lot lo ng s- lot so - lot 6.25 3 = 16:25 t/m2 So, um contined compressive Streagon at (N-13) – 16.25 Alma 1 tl m² = 9.61 kN/m2 ves= 16.25*9.81 kN/m2 Tuess 189.41 kalma l canae at N=13 in colouen of ues is between flotlan2 to 20t/m2