正交各向异性复合井壁应力变形分析与应用

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

  • 摘要: 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.

     

    Abstract: This paper derives the formulas for stressesand displacements in a compound and orthotropic shaft and analyzes thestresses and displacements in a compound shaft with two floor concreteliners and a mid-aerated plastic board. If the circumferential elasticmodulus is less than the radial elastic modulus of a shaft liner, themaximum shear stress and the radial displacement in an inner liner increaserapidly with the decrease of the circumferential elastic modulus. Consequently,if the shaft is designed based on isotropic calculation, there will besome safetyproblems. These conclusions have been proved by engineering applications andfield observations. The new design methods for the compound shaftare put forward. The reliable calculation formulas and the newconsolidation theory are obtained for designing a compound shaftbuilt with the freezing method.

     

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