In this paper the stress around a deviated wellbore was analyzed according to theMohr-Coulomb failure criterion when considering the strain soft character of damaged rockmaterials.

• 本文采用摩尔-库仑屈服条件，考虑材料损伤后的应变软化特性，对井壁岩石进行力学分析，给出维持井壁稳定的泥浆密度。