The characteristics of correlation distance of soil properties applied to geotechnical engineering are studied. And the basic method to calculate the correlation distance by correlation function is presented. The choosing criterions of standard correlation function are also discussed. It can be drawn that the value of correlation distance calculated by correlation function is reasonable when the standard correlation function is exponential function
especially single exponential function. At last
the paper provides the correlation distance of three representative soil layers in Shijiazhuang bridge east district
which will be useful for borehole distribution and sampling distance.