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COMPACTIONTECHNOLOGY(PTY)LTD

Ground Improvement Specialists LANDPAC TECHNOLOGY 25 kJ Impact Compactor & CIR APPLICATION In-Situ Compaction

WORK DESCRIPTION GROUND CONDITIONS/SOIL CHARACTERISTICS Date September 2005 Equipment 25kJ IC with Blading and

Watering Site Area 22,000m2 ; 2.2 Ha Site Development Cluster Home Development Contract Duration 1 week Site Location Caro Nome, Bonearo Park Province Gauteng Project Number SQ141

The site consisted mainly of a silty type of material of generally poor grading, with CBRs ranging from 4% to 12%. The site was also extensively covered with vegetation that had to be removed prior to compaction.

METHODOLOGY EMPLOYED PHOTOGRAPH

• 40m x 4m Trial with full testing. • 25kJ Impact Compactor – 40 roller passes. • Blading and Watering supplied. • Testing Regime:

o DCPs: Before and After. o Density Testing: Before and After. o Soaked Plate Load Testing: 450mm plate,

300mm below NGL, only performed after impact compaction.

o Vibration Monitoring required next to prefabricated wall.

o CIR: Before and After • Estimated to be 30 passes but increased to 35

passes because of the significant settlement rate between passes 20 and 30.

SITE RESULTS

DYNAMIC CONE PENETRATION

Pass 0 35 Average Penetration Rate (300-1200mm) 51.73 8.98

Standard Deviation 6.51 2.50

Equivalent DCP-CBR (%) 2.8 26.7

Consistency Medium Dense Very Dense

The consistency, in some instances, shifted from “dense” to “very dense” with approximate CBR increases from as low as 12% to as high as 50% at a depth exceeding 1.0 metre below the surface. The average increase in the equivalent CBR was from 2.8% to 26.7%.

CS‐RSA‐0508

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PLATE LOAD TEST RESULTS

The settlements of 0.44 mm to 1.65 mm can be expected at an assumed allowable bearing pressure of 100kPa.

SETTLEMENTS Settlement was not measured but estimated at a maximum of 150mm, with some sections only experiencing 50mm. The impact compactor was able to eliminate the problems that may be encountered due to differential settlement in the future.

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CONTINUOUS IMPACT RESPONSE (CIR)

CIR Plot: Passes 0-3; Section B

CIR Plot: Passes 33-35; Section B (part of)

The Continuous Impact Response (CIR) system deduced the following: • It confirmed the DCP results. • It showed that the dynamic soil response increased from pass 0 to pass

35. • The system clearly identified and delineated areas that may require

additional remediation other than impact compaction.