Homework 2 PROBLEM No. 1

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1 PROBLEM No. 1 In accordance with the project requirements, the contractor has obtained a 4 diameter core from below the shaft bottom. The core run was 5.0 and the total rock recovered was 4.2. A total of 3.7 of the recovered core consisted of core fragments greater than 4. Calculate the percent core recovery (%REC) and Rock Quality Designation (RQD). HW-1 HW2-1

2 PROBLEM No. 2 The plans for a bridge specify that the drilled shaft diameter be 48. However, the contractor supplied a temporary casing with an outside diameter equal to the specified shaft diameter (O.D. casing). The authorized shaft length below ground was 68 and the casing supplied had a wall thickness of ½. What additional length of shaft is required? HW-2 HW2-2

3 PROBLEM No. 3 For the situation presented in Problem #2, determine the factor (F) to adjust pay quantities to compensate for smaller shafts. HW-3 HW2-3

4 Proposed Top of Shaft EL = Rock Socket 50 PROBLEM No. 4 Top of casing EL = Ground Surface 48 (OD) Casing Wall Thickness = 0.5 Bottom of Casing Excavated Shaft DETERMINE 1. Length of casing below ground surface 2. Elevation at bottom of casing 3. Elevation at bottom of shaft 4. Theoretical volume of concrete in yd 3 5. Length of rock socket Bottom of Shaft EL HW-4 HW2-4

5 PROBLEM No. 5 The plans for a bridge show that the drilled shaft diameter is to be 48 and that all concrete cover is to be 6. The length of the drilled shaft is 63. Determine the total number of side spacers required. Assume the lowest level is at 1.5 ft from the bottom Spacers per Row one spacer per 30 inches of circumferenceofcagewithaminimumoffourat each level. Number of Rows within 3 feet of the bottom, within 6 feet of the top, and intervals not exceeding 10 feet along the shaft 6 HW-5 HW2-5

6 PROBLEM No. 6 Using the information from Problem 5 and below, how many CSL tubes are required for the drilled shat and what should their minimum length be Number of CSL Tubes Provide the following number and configuration of cross hole sonic logging access tubes in each drilled shaft based on the diameter of the shaft. Length of CSL Tubes from the tip of shaft to a point high enough above top of shaft to allow crosshole-soniclogging testing, but not less than 30 inches above the top of the drilled shaft, ground surface or water surface, whichever is higher. HW-6 HW2-6

7 PROBLEM No. 7 A drilled shaft contractor placed concrete in a 48 (nominal diameter) shaft which had a top elevation of ft. and a bottom elevation of 60 ft. The following information was recorded by the inspector during the concrete placement operation. Assume permanent casing having an inside diameter of 54 was used in the upper 10. The Contractor used 48 nominal drilling equipment below the upper 10. Neglect the volume of reinforcing steel, telltales, etc. DETERMINE A. The theoretical volume of the shaft. HW-7 HW2-7

8 upper 10 : (from El +5.5 to El -4.5) PROBLEM No. 7A THEORETICAL VOLUME NOTE: The theoretical volume will consist of two straight lines V T = Area x Length A = D2 4 HW-8 HW2-8

9 PROBLEM No. 7A THEORETICAL VOLUME NOTE: The theoretical volume will consist of two straight lines Below the upper 10 : (from El -4.5 to El ) V T = Area x Length A = D2 4 HW-9 HW2-9

10 PROBLEM No. 7A THEORETICAL VOLUME DATA FOR PLOTTING THE THEORETICAL At El -65 : At El -4.5 : At El +5.5 : Cumulative volume=0 Cumulative volume= cy Cumulative volume= + = cy HW HW2-

11 +20 PROBLEM No. 7B Plot the theoretical curve 0 ELEVATION IN FEET CONCRETE VOLUME PLACED (CY) HW HW2-

12 PROBLEM No. 7 B B. Plot the theoretical volume and actual volume placed of concrete. Below is the truck information HW HW2-

13 PROBLEM No. 7B C. After plotting, does the shaft appear OK? HW HW2-

14 PROBLEM No. 8 For Problem 7 : DETERMINE A. What was the actual concrete volume placed in the shaft. B. What was the overpour? C. What would be the Theoretical, Actual and overpour ratio (A/T) that you would fill in the first page of the Drilled Shaft Log? HW HW2-

15 END OF EXERCISES HW HW2-

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