ANALYSIS OF STRESSES AND DEFORMATIONS OF A COMPOUND AND ORTHOTROPIC SHAFT WITH APPLICATIONS
正交各向异性复合井壁应力变形分析与应用

This paper derives the formulas for stresses and displacements in a compound and orthotropic shaft and analyzes the stresses and displacements in a compound shaft with two floor concrete liners and a mid-aerated plastic board. If the circumferential elastic modulus is less than the radial elastic modulus of a shaft liner, the maximum shear stress and the radial displacement in an inner liner increase rapidly with the decrease of the circumferential elastic modulus. Consequently, if the shaft is designed based on isotropic calculation, there will be some safety problems. These conclusions have been proved by engineering applications and field observations. The new design methods for the compound shaft are put forward. The reliable calculation formulas and the new consolidation theory are obtained for designing a compound shaft built with the freezing method.