Effect of pile diameter on the modulus of sub grade reaction by teerawut juirnarongrit scott a ashford final report submitted to caltrans under contract no 59a0051 department of structural engineering university of california san diego la jolla california 92093 0085. This paper presents the results of a study on the effect of pile diameter on the initial modulus of subgrade reaction a series of ambient and impact vibration tests were performed on four different diameters of cast in drilled hole piles to determine the natural frequencies and damping of the soil pile systems. Therefore a larger pile diameter encounters greater displacement with simple proportion to the pile diameter resulting in a lower coefficient of subgrade reaction017 show that the ratio of predicted to measured deflection with respect to pile diameter using terzaghis concept in which the initial modulus of subgrade reaction is independent . There have been debates on the effect of pile diameter on the pile response ashford and juirnarongrit 13 claimed that the modulus of subgrade reaction is independent of pile diameter likewise . The direct method to estimate the modulus of subgrade reaction is plate load test that it is done with 30 100 cm diameter circular plate or equivalent rectangular plate after that we have to extrapolate the test value for exact foundation in the practical design procedure use of terzaghi equation to determine the modulus of subgrade reaction
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