塑料板夹层双层井壁的轴对称变形分析

针对特殊地层中的塑料板夹层双层井壁结构，应用空间轴对称问题的弹性理论建立了相应的受力分析方法。综合运用线性叠加原理、弹性通解、Fourier方法等理论，获得了该双层井壁在一般荷载条件下的一组圣维南解。通过算例分析了内壁、外壁厚度的改变对井壁环向、径向及轴向正应力的影响，并利用第四强度理论分析了立井安全性的变化。结果表明：仅增加内壁厚度对井筒内、外壁安全性的提高均不显著；仅增加外壁厚度对井筒内壁安全性的改善较小，但对于井筒薄弱环节外壁安全性的提高则较为显著。

Axisymmetric deformation analysis for the double layer shaft with a plastic interlayer

For the double layer shaft with a plastic interlayer in special stratum,the mechanical analysis method was established based on the three dimensional axisymmetric elastic theory.A Saint Venant solution was obtained for the double layer shaft under arbitrary stress boundary conditions by applying linear principle,general elastic solution and Fourier method.The effects of the inside lining thickness and the outside lining thickness on the stresses and the security of the shaft were studied.The results indicate that the security improvement of the shaft linings induced by the increase of the inside lining thickness is small;the outside lining,which is the fragile area of the shaft,can be greatly improved by the increase of the outside lining thickness.