根据规范中的表格，基准等效温度Tξ为17.5℃，由规范中的公式计算得到

According to the table in the specification, the reference equivalent temperature Tξ is 17.5℃, and the equivalent temperature of the permanent deformation of the asphalt mixture layer calculated by the formula in the specification is 19.1℃. The reliability factor is 1.04. <br>According to the layering method specified in the specification, the asphalt mixture layer is divided into 6 layers, and the thickness (hi) of each layer is shown in Table 5.12. Using the elastic layered system theory, the vertical compressive stress (Pi) at the top of each layer under the design load can be calculated separately. According to the formula in the specification, d1=-7.67 and d2=0.76 are calculated. Bring the calculation results of d1 and d2 into the formula, we can get the permanent deformation correction coefficient (kRi) of each layer, and then use the formula to calculate the permanent deformation amount (Rai) between each layer. The calculation results are summarized in Table 5.12. Each parameter needs to be calculated through the formula table in the specification. In this design, we did not list the relevant table and related parameter formula in the specification, so the calculation method and source of some data need to be in the specification check. <br>The permanent deformation of each layer is accumulated to obtain the total permanent deformation of the asphalt mixture layer Ra=4.3 (mm). According to the specification, the allowable permanent deformation of the asphalt layer is calculated to be 15.0 (mm), and the proposed pavement structure meets the requirements.

According to the table in the specification, the base equivalent temperature is 17.5 degrees C, and the permanent deformation equivalent temperature of the asphalt mixture layer is calculated by the formula in the specification is 19.1 degrees C. The reliability factor is 1.04.<br> According to the stratification method specified in the specification, the asphalt mixture layer is divided into six layers, each layered thickness (hi) as shown in Table 5.12. Using the theory of elastic layer system, the vertical pressure stress (Pi) at the top of each layer under the effect of design load can be calculated separately. According to the formula in the specification, the calculation is obtained from d1-7.67, d2-0.76. By bringing the calculations of d1 and d2 into the formula, we can get the permanent deformation correction coefficient (kRi) for each layer, and then we can calculate the amount of permanent deformation (Rai) between the layers. The results of each calculation are summarized in Table 5.12. All the parameters need to be calculated through the formula table in the specification, etc. , in this design we do not list the relevant tables and related parameter formulas in the specification, so some data calculation methods and sources need to be checked in the specification.<br>The permanent deformation of each layer adds up to the total permanent deformation amount of asphalt mixture layer Ra 4.3 (mm), according to the specification, the asphalt layer is allowed to permanently deform to 15.0 (mm), and the proposed pavement structure meets the requirements.

According to the table in the specification, the reference equivalent temperature T ξ is 17.5 ℃, and the permanent deformation equivalent temperature of asphalt mixture layer is 19.1 ℃ calculated by the formula in the specification. The reliability coefficient is 1.04.<br>According to the layering method specified in the specification, the asphalt mixture layer is divided into 6 layers, and the thickness of each layer (HI) is shown in table 5.12. Based on the theory of elastic layered system, the vertical compressive stress (PI) at the top of each layer under design load can be calculated separately. According to the formula in the specification, D1 = -7.67, D2 = 0.76 are calculated. Taking the results of D1 and D2 into the formula, we can get the correction coefficient of permanent deformation (kri) of each layer, and then calculate the amount of permanent deformation (RAI) between each layer by using the formula. The calculation results are summarized in table 5.12. All parameters need to be calculated through the formula table in the specification. In this design, we did not list the relevant tables and parameter formulas in the specification, so some data calculation methods and sources need to be checked in the specification.<br>The total permanent deformation of asphalt mixture layer is ra = 4.3 (mm) from the accumulation of permanent deformation of each layer. According to the specifications, the allowable permanent deformation of asphalt layer is 15.0 (mm), and the proposed pavement structure meets the requirements.<br>