Deep soil mixing used to reduce embankment settlement

Severe settlement and stability problems characterize the problems of the 55 km Bangna–Bangpakong Highway in Thailand. To rehabilitate this major arterial road, the deep mixing method (DMM) with soil–cement using ordinary Portland cement has been utilized for foundation improvement. In the laboratory, trial mix designs were used with a specified unconfined compressive strength of 1000 kPa. In the field, the unconfined compressive strength of the cement piles was specified at 600 kPa. Detailed soil investigations and subsequent evaluations for Section 3 from km 28 + 000 to km 34 + 500 were done. Analyses were performed regarding the bearing capacity, total settlements and their rates, and stability analyses. The predicted vertical and horizontal deformations were compared and generally agreed with the corresponding values observed in the field.