Inordertoanalysetheprojectilebodypenetratingintohigh-coldandhigh-altitudepermafrostarea,a theoretical formula was presented to calculate the maximum penetration depth.The formula was deduced by using the modified Mohr-Coulomb yielding criterion,which can well meet the character of permafrost.The results indicate that the formula can reflect the relationship between the permafrost temperature and resistance pressure observably,and also it is a good trying in using the cavity expansion theory.Comparing the results of the theoretical calculation with those of the Young's penetration equation,it is found they have a similar changing trend,thus it is demonstrated the theoretical formula is rational.Case studies also show that the maximum penetration depth is closely related to the permafrost temperature,and can reflect the characteristics of frozen soil material objectively.%为深入探讨弹体对高寒高海拔地区多年冻土的侵彻作用，从多年冻土温度特性出发，用符合冻土特性的摩尔－库伦强度准则推导该地区抗侵彻深度理论计算公式。结果表明，该公式能反映冻土温度与侵彻阻力关系，为空腔膨胀理论在冻土材料中的有益尝试。将理论分析计算结果与Young侵彻公式计算结果比较知，最大侵彻深度与速度变化趋势一致，理论公式的合理性获得论证。案例分析表明，多年冻土层温度状况对弹体最大侵彻深度关系较密切，能较客观的反映冻土类材料特性。
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