EBK PRINCIPLES OF FOUNDATION ENGINEERIN
8th Edition
ISBN: 8220100547058
Author: Das
Publisher: CENGAGE L
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Chapter 10, Problem 10.14P
Figure P13.9 shows a drilled shaft extending into clay shale. Given: qu (clay shale) = 1.81 MN/m2. Considering the socket to be rough, estimate the allowable load-carrying capacity of the drilled shaft. Use FS = 4. Use the Zhang and Einstein procedure.
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Chapter 10 Solutions
EBK PRINCIPLES OF FOUNDATION ENGINEERIN
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- A free-headed drilled shaft is shown in Figure P13.10. Let Qg = 260 kN, Mg = 0, = 17.5 kN/m3, = 35, c' = 0, and Ep = 22 106 kN/m2. Determine a. The ground line deflection, xo b. The maximum bending moment in the drilled shaft c. The maximum tensile stress in the shaft d. The minimum penetration of the shaft needed for this analysisarrow_forwardA 3 ft diameter straight drilled shaft is shown in Figure P13.7. Determine the load-carrying capacity of the drilled shaft with FS = 3. Take / as 0.8 for the sand.arrow_forwardFor the drilled shaft described in Problem 19.7, estimate the total elastic settlement at working load. Use Eqs. (18.45), (18.47), and (18.48). Assume that Ep = 20 106 kN/m2, s = 0.3, Es = 12 103 kN/m2, = 0.65 and Cp = 0.03. Assume 80% mobilization of skin resistance at working load. (See Part c of Problem 19.7) 19.7 Figure 19.16 shows a drilled shaft without a bell. Here, L1 = 6 m, L2 = 7 m, Ds = 1.5 m, cu(1) = 50 kN/m2, and cu(2) = 75 kN/m2. Find these values: a. The net ultimate point bearing capacity. Use Eqs. (19.23) and (19.24) b. The ultimate skin resistance. Use Eqs. (19.26) and (19.28) c. The working load, Qw (FS = 3) FIG. 19.16arrow_forward
- Determine the ultimate load-carrying capacity of the drilled shaft shown in Figure P13.4, using the Reese and ONeill (1989) method.arrow_forwardA hydraulic punch press is used to punch a slot in a 0.70-in.-thick plate, as illustrated in the figure. If the plate shears at a stress of 30 ksi, determine the minimum force P required to punch the slot. Punch Answer: P = Slug Plate +0.75 in. 2.00 in. Plan view of slug kips +arrow_forward90 MPa For the shown 2D stress element, sketch Mohr circle then, use Mohr circle to find the normal and shear stresses at a point on the indicated inclined plane. 105 MPa 140° 30 MPa Verify your results (ơn, Tnt) using stress transformation eqns. Illustrate the following on Mohr circle: center of Mohr Circle, reference point A, principle stresses, max in-plane shear stress, inclined plane, orientation of inclined plane) :)arrow_forward
- Show solution. The answer must be A. 36.87 B. 14arrow_forward60 mm. PA A B 2.0052 2.1298 2.3067 2.4844 2.5111 2.1933 r = 30 mm 120 mm 800 mm r = 30 mm 200 mm 60 mm P D 200 mm If a 40 mm diameter hole were to be drilled into the center of the bar shown between points Band C, determine the stress concentration factor for the hole.arrow_forwardQ3) You are in charge of drilling operations in a sedimentary basin. The figure bellow gives the setting. Prior to drilling you have performed a numerical analysis. The table below states the necessary information at the bottom of the shale layer and at the top of the sandstone layer. Assume hydrostatic pore pressure throughout the reservoir. Stress results from your numerical models at 2250m: To [MPa] Rock layer Sy [MPa] S [MPa] S, [MPa] [deg] So [MPa] Shale Sandstone 55.2 55.2 65 40 30 20 10 0.25 30 25 30 10 5 0.25 planned wellpath Shale thickness- 2250m Sandstone: thidkness 250m A. Your drilling crew on the rig wants to drill with a setting P-Po through the shale. Will you approve this and give permission? Prove your decision by calculating the necessary stresses and show a Mohr Circle construction so that the driller can understand your reason. If unsafe, which borehole failure mechanism do we expect? ; B. Should they increase, decrease P, or stay with P=Po? Why? C. Determine the…arrow_forward
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