Mtubatuba Sports Complex

Mtubatuba Sports Complex

A Mtuba Sports Complex stadium will be constructed which will be supported by reinforced concrete columns on a 7.5×7.5m grid with dead and live loads of 1350KN and 350KN respectively.

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: –

  • Strength and bearing capacities of the materials determined from estimated field consistencies, DMT & DPSH;
  • Compressibility expressed in terms of soil consistencies and deformation moduli estimated from DMT in situ tests;
  • Nominal settlement calculations performed using Geostru geotechnical software, specifically, the bearing capacity/settlement module called LoadCap, an Italian suite of software endorsed by EU Eurocode 7/8 and British Standards Codes BS8004 https://www.geostru.eu/product-category/geotechnical-software/; other software used for settlement analyses include RocScience Settle 3D and the Marchetti Dilatometer propriety software – refer to Table A below.

Dilatometer proprierty software mtubatuba sports complex

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.

RocScience Settle 3D Settlement Analysis mtubatuba sports complex


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