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本文以现行《公路柔性路面设计规范》为依据．推导出三层弹性体系轮间路表弯沉系数的逼近式，使三层弹性体系弯沉表达式中的无穷积分隐函式显示化，以利于计算式的求解并节省计算机求解的时间．本文还应用多元线性回归理论．推导并验证了四层、五层体系结构层轮间路表弯沉系数的逼近式，以适应当前铺筑多层次的高等级路面的需要．
This article is based on the current “Code for Design of Highway Flexible Pavement”. The approximation formula of road surface deflection coefficient of three-layer elastic system is deduced. Infinite integral implicit expression in the deflection expression of three-layer elastic system is presented in order to solve the calculation formula and save the time of computer calculation. This article also applies multiple linear regression theory. The approximation of the deflection coefficient of the road surface between the four-story and five-story structure layers is deduced and verified to meet the current need of paving multi-level high-grade pavement.