Load transfer data are presented for six piles embedded in sand. The data were adjusted to account for residual loads caused by driving in order to arrive at the true variation of skin friction with depth. Residual loads of 25 to 48 tons were observed for conventionally driven piles, whereas the load for a pile driven with a vibratory hammer did not exceed the weight of the driver. Friction during compression was found to exceed that during tension by 30 percent. An average lateral earth pressure coefficient of 1.1 was observed, with a value of 0.75 being observed for a jetted pile. The data indicate that conventional hammers may compact the soil below the pile tip and improve point bearing capacity. Skin friction adjacent to the pile tip was found to be significantly lower than for other parts of the pile.

A analise do solo e um meio de obter informacoes relativas a deficiencia de nutrientes e condicoes edversas do solo em areas especificadas da terra, especialmente campos de cultura individuais de uma fazenda. A informacoes obtidas deve, primeiro, ser interpretada em termos agronomicose biologicos, em relacoes ao crescimento de vegetais, a fim de determminar quais as condicoes que podem ser mudadas ou melhoradas, para que haja m aumento de producao. Posteriormente, pode ser feita a interpretacao sob o ponto de vista economico, para se determinar o que devera ser feito para se obter o lucro desejado.