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根据变分和应力虚功的概念推导一般有限线弹性体接触问题的余虚功原理，并分析其在轮轨接触研究中的应用，将轮轨接触问题分别看成无限半空间和有限体接触这样两个具有特殊边界的弹性力学问题。为进一步从数值方面精确分析轮轨接触斑提供理论依据
Based on the concept of variational and stress virtual work, the principle of Yu-Gong-Yu of general finite-line elastomer contact problem is deduced and its application to wheel / rail contact research is analyzed. The wheel-rail contact problem is treated as infinite half-space and finite body contact respectively Such two elastic mechanics problems with special boundary. In order to provide a theoretical basis for further precise analysis of wheel-rail contact spots from the numerical point of view