针对我国蒙东地区膨胀性泥岩地层斜井井壁设计问题，基于弹性力学理论，建立了在不均匀地压和膨胀接触压力共同作用下的圆形井壁理论模型，获得了受不均匀地压和膨胀接触压力共同作用下井壁的应力、位移解析解；并在井壁理论解析解的基础上，研究了井壁厚度对井壁应力和位移的影响；基于FLAC^3D中的热力耦合模块对不同井壁厚度的优化方案进行模拟，通过优化井筒断面和支护形式，确定了更合理的支护参数。数值计算结果表明：当外层井壁达到600 mm、内层井壁达到600 mm时，继续增大井壁厚度对井壁位移变形量的影响不明显；优化后支护方案可有效地抵抗膨胀性泥岩地层井筒的变形。

Aiming at the design problem of inclined borehole wall in expansive mudstone formation in eastern Mongolia, a theoretical model of circular borehole wall under the combined action of uneven ground pressure and expansive contact pressure is established based on elastic mechanics theory. The analytical solution of borehole stress and displacement under the combined action of uneven ground pressure and expansive contact pressure is obtained. The influence of wall thickness on wall stress and displacement is studied. Based on the thermal coupling module of FLAC^3D, the optimization scheme of different shaft thickness is simulated, and more reasonable supporting parameters are determined by optimizing shaft section and supporting form. The numerical results show that when the outer shaft wall reaches 600 mm and the inner shaft wall reaches 600 mm, the influence of increasing the shaft wall thickness on the displacement and deformation is not obvious. The optimized support scheme can effectively resist wellbore deformation in expansive mudstone formation.