中文摘要：

土壤的高速切削阻力是土方机械设计中的一个关键问题，已有的研究主要建立在试验基础上，用经验或半经验法导出，其使用范围有限。针对工程实践中常遇到的非饱和土壤的切削阻力计算问题，考虑饱和度与吸力的关系，采用剑桥模型，结合有效应力原理推导出非饱和土壤本构关系模型，基于非线性动力有限元法建立了非饱和土壤的高速切削理论模型。计算结果与试验结果对比，证明了该模型的可行性，可以较好地反映高速动态切削的力学特性。

英文摘要：

The high-speed cutting resistance of non-soggy soil is a bottleneck problem of the earth excavation machine design. The known methods based on experiment and deduced by experience or half experience are restricted in range of application. Considering the saturability and suction force, this paper deduces the constitutive equation of non soggy soil based on the Cambridge model and actual stress theory. A high-speed non-soggy soil cutting resistance model is formulated via the constitution equation of non-soggy soil and nonlinear finite element method, this model is verified by experiment. The results show that this model can reflect the mechanic features of high speed cutting. 5 figs, 8 refs.