Н.О 4 Point loads of magnitude 100, 200, and 400 kN act at B, C, and D, respectively (Figure below). Determine the increase in vertical stress at a depth of 6 m below point A. Use Boussinesq's equation. 6 m 6 m C 3 m

(Use The Figure (10.20) to find the solution of this question) An embankment load on a silty clay soil layer as shown below. Determine the stress increase under the embankment at points A and B that are loaded at a depth of 6 m below the ground surface. 5m 1H:2V 1H:2V 1H:1V 8 m y-18 kN/m y-18 kN/m 6 m 4. y Figure 10.19 Embankment loading 050 TTTT 3.0 20 16 045 14 12 LO 040 09 07 035 06 030 05 04 - 025 03 020 02 015 a.10 Figure 10.20 Osterberg's chart for determination of vertical stress 0.00 due to embank- 0.01 0.1 10 100 ment loading 327

3- Due to application of line loads q1 and q2, the vertical stress increase at point A is 42 lb/ft?. Determine the magnitude of q2 q.=292 Ib/ft 92 45° 4.5 ft 3 ft 3 ft A

A point load Q = 250 kN is applied to the ground surface. What is the minimum depth Zi in m below the point load such as the increase in vertical total stress does not exceed 10 kPa. Do not consider any eccentricity for this question. (Acceptable tolerance = 2%).

Calculate the added vertical stress at points A and B as deep as Z = 8 m, under the rectangular load

The center of a rectangular area at the ground surface has Cartesian coordinates (0, 0), and one corner has coordinates (7, 18). All dimensions are in meters. The area carries a uniform pressure of 135 kPa. Estimate the stresses at a depth of 15 m below the ground surface at each of the following locations: (0, 0), (0, 18), (7, 0), (7, 18), and (12, 28).a. Obtain the values by the Boussinesq methodb. Compare the results with those of the 2:1 methodc. Comment on the resultsHint: In the Boussinesq method, the equations attached can be used.

6- A flexible rectangular area is subjected to a uniformly distributed load of q=250 lb/ft?. Determine the increase in vertical stress at a depth of z=6 ft under points A, B, and C. 6 ft + 2.5 ft 3 ft 1.5 ft A C q=250 Ib/ft? 1.8 ft

An electric power transmission pole is 12 m above ground level and embedded 2 m into the ground. The butt diameter is 450 mm and the tip diameter (the top of the pole) is 320 mm. The weight of the pole, cross arms, and wires is 33 kN. Assuming the pole transmits the load as a point load, find the change in vertical stress in kPa at 2 m depth.   a. 17.8 b.393.9 c.63.0 d.3.9

An embankment load on a silty clay soil layer as shown below. Determine the stress increase under the embankment at points A and B that are loaded at a depth of 6 m below the ground surface, please use figure (10.20). 5 m 1Н:2V, 1H:2V 1H:1V 8 m y=18 kN/m y=18 kN/m" 6 m : B Figure 10.19 Embankment loading 0.50- 3.0 20 16 0.45- 14 1.2 LO 0.40 - 0.9 0.8 0.7 0.35 - 0.6 030- 05 04 * 025 - 03 0.20 - 0.2 0.15 - 0.10 - 0.1 0.05- Figure 10.20 Osterberg's chart for determination of vertical stress 0.00 TI TT - due to embank- 01 0.1 10 ment loading 100 327

The cross-sectional area of bar ABCD is 500 mm^2 . Determine the stress in segment BC