Abstract: In this paper, twoloading experimental results are introduced by using both strong frequency borehole strain meter and volume strain gauge. According to the elastic mechanical theory and method, both mechanical model and boundary condition for strain measurement in borehole loading experiment are simplified. Soclassical focal force acts on Boussinesq' solution on the surface of half-limitless elastic body. It may be applied in the quantitative re searchabout the measure of borehole strain in variety of the loading on the surface. The experimental method, re search thought and calculation method will supply the significanthelp for the quan-titative re search of the load disturbance in the borehole, the mechanical nature of rock,estab-lishing observation technical st and ard and observation criterion and soon.

Key words: Stress and strain, Load, Solution of Boussinesq, Main Strain, Yang modulus