一、引言超载是目前我国公路交通运输的重要特点。车辆超载对轴载换算的影响很大,如以黄河JN150超载20％计,可以使轴载换算误差高达4.6倍,因而车辆的超载不容忽视。现行《公路水泥混凝土路面设计规范》(JTJ012—84)以综合系数K_C考虑车辆的超载。实际上K_C还包含其它因素如偏载、装载 I. INTRODUCTION Overloading is an important feature of China’s road transport. Vehicle overloading on the conversion of the great impact on the axis, such as the Yellow River JN150 20% overload, can make the axles conversion error up to 4.6 times, so the vehicle overload can not be ignored. The current “Code for Design of Highway Cement Concrete Pavement” (JTJ012-84) considers the overload of vehicles with the comprehensive coefficient K_C. In fact K_C also contains other factors such as partial load, loading