DETERMINATION OF BEARING CAPACITY OF SANDY SOIL FROM LIGHT RAM SOUNDING TEST RESULTS FOCUS ON EFFECT OF CONE ANGLE

Abstract

The Objective of this research was to study the effect of cone angle and water level on the bearing capacity of sandy soil layer. Two type of sandy soil which are poorly-graded soil (SP) and silty soil (SM) provided in the process of sandy soil preparation. The tasting results show that the adjusted factors of the bearing capacity for 60º cone and 180 º cone to be that of 90º cone (standard) were 1.118 and 0.878 respectively. The correlation of the blows against the internal friction angle of sandy soil can be used for calculating the soil bearing capacity in the condition of the 1 m deep below the ground surface which corresponding to the advice of Peck, Hanson and Thornburn (1973). The soil bearing capacity of SP with water level increases 35-40 percent compering to dry soil and the bearing capacity of SM with water level decrease 70-75 percent compering to dry soil. The effect of the water level result in the decrease of the soil bearing capacity of 25-30 percent which result to 0.6 m above the water level compering to that of the dry soil at the same depth. Therefore, the calculation of the soil bearing capacity in the silty sandy soil layer should be considered the effect of the water level.