正交各向异性复合井壁应力变形分析与应用

推出了正交各向异性多层复合井壁的应力、位移计算公式，分析了双层混凝 土中间夹泡沫塑料板的复合井壁的应力、变形规律. 发现当井壁环向弹性模 量小于径向弹性模量时，内壁最大剪应力和径向位移会随着环向模量的减小 而显著增大，若仍按各向同性设计，将可能出现病态井壁. 通过工程应用和现场测 试综合分析验证了上述结论，并提出了多层复合井壁破裂的新依据.

ANALYSIS OF STRESSES AND DEFORMATIONS OF A COMPOUND AND ORTHOTROPIC SHAFT WITH APPLICATIONS

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.