G MS THESIS_final version_Maxim Prokudin.pdf - Digital Repository ...

23Site soil conditions were described as soft Lake Bonneville interbedded clay and silt deposits.The Cone Penetration Test (CPT) resistance was approximated at 1 MPa. The equipmentused for testing of the piers included aggregate pier load test frame, tell-tale plates, stresscells, and displacement transducers. The investigation was primarily oriented towardsmodulus testing of single piers, groups of five piers and footings placed over theunreinforced matrix soil.The major findings showed that the response of the individual pier closely follows the stresssettlementresponse of the pier within the group of five. At the 25 mm of settlement, theaggregate pier supported footing featured three times the bearing capacity of the footingsupported by in-situ soil with no reinforcement. Obtained stress-settlement results can befound in Figure 12:Applied stress at top of the footing (kPa)00 500 1000 1500 2000 250050Settlement (mm)100150200Response of modulus test pierResponse of piers within the group test250Figure 12: Utah modulus test for single pier and group of five (reproduced perWissmann et al, 2007)