FOUNDATION DESIGN AND SLOPE FAILURE PROTECTION FOR A LARGE COMMUNITY BUILDING IN KHANOM, NAKHON SI THAMMARAT

In geotechnical engineering, the bearing capacity of soil to support the building loads applied to the ground and slope failure behavior analysis have significance for design protection in important buildings (e.g., roads, dams, soil embankment), and land filling procedure before construction in Thailand. Frequent landslides and mistake on foundation designs occur in Khanom, causing properties damage and casualties. This study aimed to analyze ultimate bearing capacity of soil and study the influence of unsaturated slope stability on a hill range in one particular southern part of Thailand (Khanom district in Nakhon Si Thammarat province). A GIS survey, the area’s geology, geotechnical laboratory results and rainfall intensity were carried out and analyzed in order to verify the use of factor of safety for an early warning indicator. Moreover, the research focuses on designing foundation and calculation ultimate bearing capacity of soil that necessary for a site engineer at large communication building in Khanom, Nakhon Si Thammarat. In the analysis result, suitable shallow foundation is 0.7 x 0.7 m2 of square footing put on lower soil (SM) 70 cm with the ultimate bearing capacity 82.54 t/m2.