The horizontal cross-section of the cast-iron standard of a vertical drilling machine has the form shown. The line of thrust of the drill passes through P. Find the greatest value the thrust may have without the tensile stress exceeding 15 MN/m2. What will be the stress along the face AB? (Cambridge) 12.4 + 19.0cm HA 36 cm- 1.60 cm 1.90 cm 1.60 cm 17.5cm ·

The horizontal cross-section of the cast-iron standard of a vertical drilling machine has the form shown. The line of thrust of the drill passes through P. Find the greatest value the thrust may have without the tensile stress exceeding 15 MN/m2. What will be the stress along the face AB? (Cambridge) 12.4 + 19.0cm HA 36 cm- 1.60 cm 1.90 cm 1.60 cm 17.5cm ·

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter19: Drilled Shaft

Section: Chapter Questions

Problem 19.8P: For the drilled shaft described in Problem 19.7, estimate the total elastic settlement at working...

See similar textbooks

Similar questions

Question 1 State whether true or false; if false, explain why: a. Buoyancy is the factor that decreases the actual weight of the drill string. b. The three major operational parameters are bit load, bit rotation and circulation rate. c. Adequate upward velocity of drilling mud is necessary to carry the cuttings outside the hole. d. Horizontal drilling is the most difficult drilling system. e. Drilling is the operation by which the drill string is forced into the rocks by the cutting action of the rock bit at the
Given: b = 350 mm d = 420 mm f'c = 30 MPa fy = 275 MPa Mu = 200 kN-m diameter of Rebar = 20 mm Required: 1 Depth of stress block, mm 2 Depth of the neutral axis, mm 3 Number of 20mm rebars
Through the pipeline system in the figure calculate gauge and absulate presures at A and B
Given the cross sectional area below. The horizontal neutral axis is 129.0mm fromreference corner 1. The moment of inertia around this neutral axis is 1073352100.6mm4. a) Draw the shear stress distribution of the section if there is a shear force on the sectionof 10kN.b) What percentage of the shear force is carried by the cross section between 2 and 3?
(a) Calculate the width of the wall that is compulsory to prevent the wall from sliding. Use yconcrete = 23.0 kn/m3, u = 0.75, FSS = 1.5. (b) Calculate the factor of safety against overturning. Neglect uplift pressure. Use 2 decimal places in every solved value.
Problem 1 What force is required to punch 20-33 diameter hole in a plate that is 25mm thick? The shear strength of the plate is 350 MN/m2? ANS: V= 550,000N
A cut slope was excavated in sand. The slope is shown in following attachment . To find the properties of the sand, representative samples were taken for the soil and tested in atriaxial apparatus. A consolidated drained triaxial test was conducted. The result is given below:Chamber pressure = 103 kN/m2Deviator stress at failure = 234.6 kN/m2We know the unit weight of the sand is 16 kN/m3.Use the ordinary method of slices (use 7 slices) and estimate the factor of safety against sliding forshown slip surface and comment on the calculated factor of safety.Please note that:1. The figure is not in scale. You may resketch it in scale and calculate the factor of safety2. The slip surface is circular and passes through the toe of the embankment
Hint: The problem is 10.10 taken from the book " introductory to mining engineering " written by "Howard L.Hartman" A single rectangular opening 10 ft in height is driven in rock having strengths of fc=18000 lb/in2 and ft= 1500 lb/in2. Rock specific gravity is 2.3. The opening is located at a depth of 2000 ft in a stress field of no lateral pressure and has a fillet ratio of 1/6. (a). Determine if the opening will fail when its width is 20 ft ? (b). What is the maximum safe width of the opening?.A single rectangular opening 10 ft (3.0 m) in height is driven in rock having strengths of fc = 18,000 lb/in2 (124 MPa) and ft=1500 lb/in2. (10.3 MPa).Rock specific gravity is 2.3.The opening is located at depth of 2000 ft (610 m) in a stress field of no lateral pressure and has a fillet ratio of 1/6 .a. Determine if the opening will fail when its width is 20 ft (6.1 m).b. Is there any benefit to reducing the width to 10 ft (3.0 m)? To 5 ft (1.5 m)?c. What is the maximum safe width of opening?
Define while applying the direct shear test on sand grains and for glass rods, will the angle of internal friction be of same range?
A piece of engineering equipment is supported by thefoundation shown. The diameter of the circular pinis 20 mm. a.) Determine the value of P so as not toexceed the allowable bearing stress of310.5 Mpa in the circular pin.b.) Determine the value of P so as not toexceed the allowable shearing stress of 138Mpa in the circular pin.
For 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. 19.16
What is the area of the tube? What is the total length of the median line? What will be the result shear flow of the object? The shearing stress value will be The angle of twist will be