USE TABLE 1

South Australian Health and Medical Research Institute (SAHMRI), which you proposed site investigations for needs to design a permanent, embedded retaining wall around the eastern perimeter of the site to retain the surrounding earth and the existing adjacent rail operations and control centre building, while the basement for the SAHMRI building is excavated. Assume that the building lower basement level is 28 m AHD for Level 00, where AHD is Australian Height Datum (meaning sea level as zero elevation). The existing rail operations control centre building imposes a uniform surcharge of 20 kPa and is sensitive to ground movement. The wall must act as a vertical cantilever (no propping to give lateral support) in the short term (until the basement floors are cast). The geotechnical models that are to be used for retaining wall design are provided in Tables 1 and 2 overleaf. Choose a single geotechnical model based on your student IDs and proceed with design calculations. Design the retaining wall and provide the following in your design: (a) A neat sketch of the cross-section of the wall in elevation. The sketch should show the existing upper ground level, building lower basement level and layered soil profile. (5 marks) The type of retaining wall and the basis for selection of this type of wall, including the advantages and disadvantages of the selected type of wall. (no more than 42 page) (5 marks) c) Calculations for stability of a retaining wall, as well as the embedment depth of the retaining wall below the lower basement excavation level. If spreadsheets are used and included, example hand calculations must be provided to verify the spreadsheet solutions. (30 marks) (b) Table 1 Geotechnical Model for student ID numbers ending in range of 0 to 4. Depth Below Ground Surface (m) Layer Description sat Ybulk (kN/m) Cu (kPa) (deg) (kPa) (deg) 0-2 Gravelly Sand 17 0 30 0 30 2-3 17 50 0 2 25 Silty Sandy CLAY Silty CLAY 3-11 19 150 0 6 27 11-12 SAND 19 0 36 0 36 0 35 12-15 Medium Dense 19 0 35 Gravelly SAND Dense to Very Dense 15-25 20 0 40 Gravelly SAND Depths are with respect to the existing ground surface, which is 35 m AHD. Groundwater stands at an elevation of 20 m AHD 0 40 Table 2 Geotechnical Model for student ID numbers ending in range of 5 to 9. Depth Below Ground Surface (m) Layer Description sat, bulk (kN/m) Cu (kPa) Ou (deg) (kPa) (deg) 0-1 17 0 30 0 30 1-5.5 Gravelly SAND Silty CLAY Clayey SAND 18 100 0 4 26 5.5-9 19 0 35 0 35 9-10 19 0 35 0 35 Medium Dense Gravelly SAND Dense to Very Dense Gravelly SAND 10-25 20 0 40 0 40 Depths are with respect to the existing ground surface, which is 35 m AHD. Groundwater stands at an elevation of 20 m AHD South Australian Health and Medical Research Institute (SAHMRI), which you proposed site investigations for needs to design a permanent, embedded retaining wall around the eastern perimeter of the site to retain the surrounding earth and the existing adjacent rail operations and control centre building, while the basement for the SAHMRI building is excavated. Assume that the building lower basement level is 28 m AHD for Level 00, where AHD is Australian Height Datum (meaning sea level as zero elevation). The existing rail operations control centre building imposes a uniform surcharge of 20 kPa and is sensitive to ground movement. The wall must act as a vertical cantilever (no propping to give lateral support) in the short term (until the basement floors are cast). The geotechnical models that are to be used for retaining wall design are provided in Tables 1 and 2 overleaf. Choose a single geotechnical model based on your student IDs and proceed with design calculations. Design the retaining wall and provide the following in your design: (a) A neat sketch of the cross-section of the wall in elevation. The sketch should show the existing upper ground level, building lower basement level and layered soil profile. (5 marks) The type of retaining wall and the basis for selection of this type of wall, including the advantages and disadvantages of the selected type of wall. (no more than 42 page) (5 marks) c) Calculations for stability of a retaining wall, as well as the embedment depth of the retaining wall below the lower basement excavation level. If spreadsheets are used and included, example hand calculations must be provided to verify the spreadsheet solutions. (30 marks) (b) Table 1 Geotechnical Model for student ID numbers ending in range of 0 to 4. Depth Below Ground Surface (m) Layer Description sat Ybulk (kN/m) Cu (kPa) (deg) (kPa) (deg) 0-2 Gravelly Sand 17 0 30 0 30 2-3 17 50 0 2 25 Silty Sandy CLAY Silty CLAY 3-11 19 150 0 6 27 11-12 SAND 19 0 36 0 36 0 35 12-15 Medium Dense 19 0 35 Gravelly SAND Dense to Very Dense 15-25 20 0 40 Gravelly SAND Depths are with respect to the existing ground surface, which is 35 m AHD. Groundwater stands at an elevation of 20 m AHD 0 40 Table 2 Geotechnical Model for student ID numbers ending in range of 5 to 9. Depth Below Ground Surface (m) Layer Description sat, bulk (kN/m) Cu (kPa) Ou (deg) (kPa) (deg) 0-1 17 0 30 0 30 1-5.5 Gravelly SAND Silty CLAY Clayey SAND 18 100 0 4 26 5.5-9 19 0 35 0 35 9-10 19 0 35 0 35 Medium Dense Gravelly SAND Dense to Very Dense Gravelly SAND 10-25 20 0 40 0 40 Depths are with respect to the existing ground surface, which is 35 m AHD. Groundwater stands at an elevation of 20 m AHD