The Application and Research of the Technology of Sliding Micrometer in Pile Frictional Resistance Test

This paper illustrates the essential principle and characteristic of the sliding micrometer,and by an engineering case proposes that it can raise the test accuracy of pile frictional resistance,considering some factors such as the nonlinearity of stress and strain of pile shaft concrete and the variation of pile diameter,and discusses the solution way of the non-homogeneity of pile shaft concrete.