Shear strength of soil reinforced by Acacia Mangium Willd's Root.

Abstract

This research is to study the engineering properties of soil reinforced with Acacia root compared with bare soil. The growth rate of Acacia, the tensile strength of the acacia root, Shear Strength of Soil Reinforced by Acacia Root were studied. Moreover, the pulling strength of the acacia root system at different growing period were also studied. Acacia trees were planted into PVC cylinders, 15 cm in diameter, and 10 cm in length each, arranged in 3 pieces and covered with plastic bags to prevent moisture loss, then measured the size and growth of the Acacia tree. The acacia tree has a rapid growth within 12 months, and the Acacia tree had a height of more than 1 meter. The root tensile strength test found that the root of the Acacia tree had a tensile strength of 1,485 grams per square centimeter. The shear strength test of the soil reinforced with the acacia root system over time showed that growth increased shear strength. At the same time, the tensile strength of the root is equal to 0.139 kg per square centimeter at 12 months of planting. The pulling force of the 12-month-old acacia tree was 55 kg. The shear strength of the acacia root reinforced soil, and the tensile strength tended to increase with the age of planting and the different moisture content, which significantly influenced the stability of soil slope.