ASSIGNMENT
Determine the difference in the predicted settlements based on two approaches. One approach is based on Cone Penetration Testing (CPT) data (Section 9.5 in Text) which was developed by John Schmertmann and the other is based on Pressuremeter (PMT) testing (Section 9.8 in Text) that was developed by Jean-Louis Briaud.
Testing was conducted at the location shown in the Google Earth Image given below.
The CPTu or Piezocone (i.e., cone tests with pore water pressures measured) data from a 2018 sounding 25 feet deep in the former Olin Engineering Overflow parking lot is included at the end of this file. This sounding was performed by Jim Handley of the In-situ Group in Sebastian Florida. Note the corrected cone resistance (Qt) and corrected friction resistance (Lf) are used to calculate the friction ratio in % using Lf /Qt*100.
The PMT data from two separate PMT tests (one at 5 feet and the second at 17 feet) are included in this Canvas Folder. These tests include an unload-reload loop, which is performed by unloading from the existing pressure within the linear portion of the curve to ½ that pressure.
They also include unloading data once the maximum volume of water is injected. These two sets of data are highlighted in the spreadsheets. They should be EXCLUDED from your settlement prediction since they were not used in the development of Briaud’s 2007 procedure.
Each student in the class has been assigned the load and footing dimensions shown in the table below. All footings are to be located 3 feet below the ground surface. Assume that the ground water table is at a depth of 5 feet. According to the client, the maximum allowable settlement is 1.00 inch. Determine the predicted settlement for your footing and loading based on both the CPTu and PMT data.
Type up one paragraph (300 words or less) summarizing your findings.
