Results of Load Tests on DMM Piles Set in Lateritic Soil-PPT Presentation

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The study evaluated deep mixing method (DMM) piles installed in lateritic soil under a tropical climate with approximately 2,000 mm of annual rainfall. The soil contained clay and silt fractions, with mineral compositions varying by depth. The soil–cement mixture used 120 kg of Portland cement per cubic metre—about 8% of the dry soil mass—and achieved unconfined compressive strengths of approximately 400–500 kPa.<br /><br />Two 0.6 m diameter piles, E11 and E13, were constructed using a hydraulic drill to a maximum depth of 3.5 m. Installation took place in May 2019 at 60 revolutions per minute, with an average advance of 9.5 mm per revolution. E11 received one mixing cycle, while E13 received two.<br /><br />Static and rapid load tests were conducted. An initial test of E11, 30 days after construction, could not be completed because of problems with the reaction system. Tests on both piles followed at 75 days; E11 was tested again in August 2020. Based on the load corresponding to 5 mm settlement, estimated capacities were 203.7 kN for E11 in 2019, 217.2 kN for E11 in 2020, and 162.9 kN for E13. The Van der Veen method gave estimated rupture loads of 207, 232, and 200 kN, respectively.<br /><br />The results suggest that DMM piles may be a promising foundation option in lateritic soils. Further research is needed to better establish their resistance and suitability for foundation engineering.

Keywords

deep mixing method

DMM piles

lateritic soil

tropical climate

soil-cement mixture

Portland cement

unconfined compressive strength

static load test

rapid load test

foundation engineering