3.8 Following are the standard penetration numbers deter- mined from a sandy soil in the field. (Note: The unit weight of soil for 0-6 m is 16.66 kv/m³; and is 18.5 kN/m³ from z = 6-12 m.) Depth (m) 3 4.5 6.0 7.5 9.0 10.5 12.0 Unit weight of soil (kN/m³) 16.66 16.66 16.66 18.5 18.5 18.5 18.5 No 7 9 11 16 18 20 22 ALE Using Eq. (3.30), determine the variation of the peak soil friction angle, '. Estimate an average value of o' for the

3.8 Following are the standard penetration numbers deter- mined from a sandy soil in the field. (Note: The unit weight of soil for 0-6 m is 16.66 kv/m³; and is 18.5 kN/m³ from z = 6-12 m.) Depth (m) 3 4.5 6.0 7.5 9.0 10.5 12.0 Unit weight of soil (kN/m³) 16.66 16.66 16.66 18.5 18.5 18.5 18.5 No 7 9 11 16 18 20 22 ALE Using Eq. (3.30), determine the variation of the peak soil friction angle, '. Estimate an average value of o' for the

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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The consideration site drilling known geological data are shown in Table 1, determine the site category.
The following are the results of a standard penetration test in sand. Determine the standard penetration numbers, (N₁)60(CORR), at the various depths given. Note that the water table is at depth 5.0 m. Assume that the average unit weight of sand is 15.5 kN/m³ above the water table and the saturated unit weight of sand is 17.81 kN/m³, while the unit weight of water = 9.81 kN/m³. Depth (m) 0.0 1.5 3.0 4.5 6.0 7.5 N60 0 10 15 19 24 28
2- Subsurface geotechnical investigations carried out in a deposit of sand provided the field standard penetration numbers N60 as given in the table below. During the geotechnical investigations, it is also observed that underground water table is encountered at a depth of 2.0 m below the ground surface. Laboratory tests have shown that physical properties of deposit of sand are as: Dry unit weight = 17.6 kN/m³ and saturated unit weight = 19.6 kN/m³. Determine, for an earthquake magnitude of 8.25, if liquefaction will occur at the site. Assume that maximum peak ground acceleration at the site is: amax = 0.25g. (6 points) DEPTH (M) N60 (BLOWS/30CM) 3 5 6 7 9 11 12 14 18 21 Note: the gravitational acceleration could be taken as 9.81 m/s².
8. Estimate the settlement of the center of the tank, shown in the sketch, due to consolidation of the 20-ft layer of clay. 80'diam. -Oil tank; 500 lb/sq ft 30' fine sand; 125 lb/cu ft 20'clay; qu = 1.3 tons/sq ft W = 54 % Wp = 26% W = 44% Isat = /15 lb /cu ft %3D Rock %3D %3D
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7. Refer to soil profile shown in Fig. 1. If the cone penetration resistance (qc) at ʻA’ as determined by an electric friction cone penetrometer is 0.6 MN/m², determine the undrained cohesion, cu and OCR. 2 m Clay, y= 18.3 kN/m³ 6 m Clay, Ysat 19 kN/m • A
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9.4 An exploratory drill hole was made in a stiff saturated clay (see Figure 9.9). The sand layer underlying the clay was observed to be under artesian pressure. Water in the drill hole rose to a height of 4 m above the top of the sand layer. If an open excavation is to be made in the clay, how deep can the excavation proceed before the bottom heaves? Exploratory drill hole G₁=2.72 6.1 m Moisture content -35% m 4m £ Saturated clay Sand
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Question: Open channel test is performed and according to the following; (Q = 0.03484 m3/sn)( sill thickness = 2.5 cm) a) Find the critical depth b) Find minimum energy on the sill y=6.6 cm y2 = 1.6 cm Sill
b) Table Q2 provides the result of a standard penetration test in the sandy soil. The water table was not encountered during the test. Assume that the average unit weight of sand is 17.3 kN/m³ and use Skempton's relationship provided, determine the corrected standard penetration numbers, (N₁)eo at various depths given (CO1, PO2) (C3) 2 Skempton's equation: C = = 1+0.010! Table Q2 Depth (m) Noo 1.5 3.0 4.5 6.0 7.5 |4712419|
Q3/ A standard penetration test was carried out at a site. The soil profile is given in Fig. 3 with the penetration values. The average soil data are given for each layer. Compute the corrected values of N60, (N1)60 and o average for sand layers only. Assume: standard 10 sampler, united state safety hammer and diameter of borehole 150mm. Depth (m) 0 12 14 Sand 7-18.5 kN/m 18.5 kN/m Sand 19.81 kN/m 2m +4+E Im N-value