The Dynamic Compaction technique is used worldwide to improve material insitu up to a depth of 10 m. As undeveloped properties are becoming scarce and increasingly expensive, sites previously unsuitable for development can now be developed using Dynamic Compaction. Typical problem soils are:
1.
Collapsible soil zones.
2.
Dump sites containing boulders, builders’ rubble, domestic and industrial waste.
The technique imparts energy into the insitu material so as to consolidate and improve its bearing capacity. The energy can be controlled to consolidate to a required design depth (2m, 3m, 4m and up to 12m). We can, depending on the inherent composition of the material, provide a bearing capacity of up to the material, provide a bearing capacity of up to 250 KP a for normal strip or pad foundations.
ADVANTAGES OF DYNAMIC COMPACTION:
•
inexpensive if compared to conventional earthworks operations (remove and replace method) and piling
•
fast production rate of 400 – 900 m2/day depending on the depth o treatment required
•
bearing capacity and settlement characteristics can be improved by as much as 10 time
•
properties that were previously unsuitable for development can now be developed
•
dolomite sinkholes can now be rehabilitated fast, economically and safely.
•
GeoCompaction Dynamics provides ‘design and construct’ package to suite the requirements of clients.
PERCUSSION PILING
With the need to socket convention piling into solid bedrock, the percussion pile was developed to complement the existing piling techniques currently on the market. A pneumatic drilling rig is used to install percussion piles through the incompetent material into bedrock. Percussion pile diameters ranging from 110 mm to a maximum of 914 mm can be installed. The system can be temporary or permanently cased through the incompetent horizon so as to avoid collapse of material before the pile is cast. Once through the incompetent horizon, the drilling is advanced into the solid rock – generally to a depth of 6 – 8m. The reinforcing is then placed centrally in the hole and either concreted or grouted using the tremmie technique.
LATERAL SUPPORT (permanent and temporary)
•
Perimeter Piling
•
Rock Bolts
•
Post Tensioned Anchors
•
Structural Guniting
•
Soil Nails
Due to the strict Occupational Health and Safety Act standards regarding sidewall support during excavations, lateral support of excavated faces has become a necessity on construction site.
GeoCompaction Dynamics can offer the client the option to construct a Permanent Support system which can be used as an integral part of the structure in terms of load bearing and aesthetics, or as Temporary Support to secure the excavated faces during the construction process.
