Wall loads will be in the region of 250KN/m.
The fieldwork comprised a walk-over inspection followed by the excavation of five test pits, profiling, and sampling. In situ soil testing comprised Dynamic Penetration Super Heavy (DPSH) and Marchetti flat dilatometer (DMT) tests at selected positions in close proximity of test pits 1, 4 and 5.
The site is blanketed by light beige, loose to medium dense sand sequentially intercalated with silts, clays and silt/sand/clay mixes with a basal pebble layer sandwiched between the cover soils and basalt bedrock present at approximately 18m below natural ground level.
The site soils comprising about 18m of unconsolidated sediments associated with coastal deposits – mainly sand-silt-clay mixes have been examined and tested to determine their material properties and behaviour according to the following criteria: –
Due to the narrower foundation width, the DOSI (depth of significant influence) is deeper on the strip footings, however, the nett foundation pressure is less and settlement is expected to be approximately 45mm (ranging from 32mm to 60mm). The square footing (1.8 x 1.8m) beneath the 7.5m column grid will experience approximately 59mm of settlement due to higher anticipated foundation pressures. In both cases, the pressure bulbs just affect the soft clay layer and this creates a second zone of compression – refer to Diagram A below.
