It is of great importance to precisely appraise the mechanic characteristics and provide credible design parameters of soils for the design of foundation engineering. At present

the strength and deformation parameters are tested by different test methods whose precisions differ from each other

and the soils are disturbed inevitably to some degree

so are the stresses in the soils. The self-boring in-situ shear pressuremeter test

on the basis of the conventional pressuremeter test and the indoor direct shear test

adopts the self-boring technique

sends the probe to the preplanned depth of soils

tries its best to reduce the disturbance and holds the initial stresses in the earth. The unique structure and loading method make it possible to directly attain many mechanic parameters

such as the strength and deformation parameters

earth pressure at rest

coefficients of subgrade shear reaction

pile friction and so on. And the self-boring in-situ shear pressuremeter test is a testing technique in the drilling boreholes

so it can obtain the mechanic parameters of different depths in the soils.