正交各向异性岩体孔径变形法的二维地应力分析方法改进

根据正交各项异性材料的弹性理论，推导出偏轴坐标系下的三维、二维本构方程；利用应力变分法对钻孔周围的应力分布作出修正，进一步得出孔壁径向位移的计算公式。结合孔径变形法测量地应力的特点，建立正交各向异性岩体地应力的分析理论，通过一典型工程与传统的各向同性理论进行了对比。

Amending a method of 2-D geostatic stress measurement for orthotropic rockmass

Based on the elastic theory of orthotropic material,the 2-D and 3-D constitutive equations are obtained in off-axes coordinate system.The stress distribution near the borehole is amended by applying stress calculus of variation,and in addition,the equation for calculating radial displacement of wall of borehole is gotten.With the character of borehole radial deformation in ground stress measurement,a method is put forward for measuring the geostatic stress of orthotropic rockmass.It is verified in a practical project comparing with the conventional isotropic method,and its validity is proved.