ERROR PROCESSING AND PRECISION ESTIMATION FOR ROCK STRESS MEASUREMENT

The least square method for rock stress measurement is described in this paper. The method of precision estimation is improved. Precision estimation is made more reliable using error calculation by the law of covariance propagation. By coordinate transformation of stress we have the differential relationship between the principal stresses and stress components to facilitate deviation calculation. Precision estimation of principal direction is more objective by using principal stress deflection error proposed in this paper.