Project title : Soil Engineering Properties in Soil Pit, Tambon Don Pao, Mae Wang District, Chiang Mai Province
Abstract: Soil is a naturally occurring material from the physical and chemical decomposition of rocks and minerals. Soil is a useful resource for construction industry. This independent study is investigating soil physical properties and soil engineering properties in soil pit at Don Pao, Mae Wang District, Chiang Mai Province. The study of physical properties includes water content, specific gravity, grain size distribution, and Atterberg's Limits. The study of engineering properties consists of direct shear test and soil classification according to the standards of the American Association of State Highway and Transportation Officials (AASHTO) and the Unified Soil Classification System (USCS). The objective of this study is to assess the soil suitability for engineering uses.
The results of the study are as follow : 1) the water content is 10.10%-10.87%, 2) the specific gravity is 2.65-2.78, 3) the grain size distribution contains 19.29%-21.46% gravel size, 67.56%-72.18% sand size, and 3.05%-10.98% silt and clay size, 4) liquid limit is 21.75%-33.55%, 5) plastic limit is 15.15%-21.72%, 6) plastic index is 6.60%-11.99%, 7) the cohesion is 16.75 kN/m2 , and 8) the angle of friction is 23.99 degrees. The soils in the soil pit, Don Pao, Mae Wang District, Chiang Mai Province have medium plasticity and are well graded. According to the Unified Soil Classification System (USCS), it is SC (clayey sand). Based on the American Association of State Highway and Transportation Officials (AASHTO), it is A-2-6 soil. Thus, the soil in the study area is considered to be a good grade material.