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1、Part I Asphalt Pavement Design1. Project StatementA newly-built highway is planned in Northeast China: Design speed: 120km/h Four-lane two-direction roads Subgrade with: 24.5m=4*3.75+2*2.5(Hard shoulder) +2*1.5(soil shoulder) Pavt type: Asphalt pavement Design life: 15 years Task: using the given co
2、nditions design asphalt pavt structures for different road sections 2. Design data2.1 Natural & Geographical ConditionsNatural Zone: II2Soil Type: clay soils with a medium value of liquid limitEmbankment: 0.6m of heightWater table: 1.6m from the roadbed surfaceClimate: Annual Rainfall of 680mm; HT:
3、26.5C; LT: -34CFrost-thaw:Max frozen depth of 183cm;Frozen index of 1623C on average and 2140C in Max2.2 Traffic Analysis2.2.1 Axle load spectrumTraffic Composition (Table 1)Vehicle Type1s+1d1s+2d1s+1d2d1s+2d2d1s+1d3d1s+2d3dTraffic Volume1502503502506050Load Spectrum of Single Axle (Table 2)Axle Loa
4、d2030405060708090100Single tire3.18%10.56%15.74%37.35%26.34%4.68%1.47%0.68%0.00%Duel tires0.00%3.75%9.52%9.98%10.84%4.03%5.95%4.58%2.35%Axle Load110120130140150160170180Single tire0.00%0.00%0.00%0.00%0.00%0.00%0.00%0.00%Duel tires7.53%4.35%8.23%5.85%4.35%7.21%7.85%3.81%Load Spectrum of Tandem Axles
5、(Table 3)Axle Load4060801001201401601802002202401s+2d3.60%7.30%14.40%18.00%3.60%7.30%8.00%10.90%16.00%10.90%0.00%1s+1d2d1.60%5.30%12.40%16.00%3.44%6.70%6.00%7.43%14.00%8.90%2.31%1s+2d2d0.63%0.90%2.00%1.38%3.51%5.97%5.50%7.21%4.61%3.74%10.90%1s+2d3d0.00%0.00%0.50%2.34%0.80%6.96%5.24%7.66%12.10%18.60%
6、5.91%Axle Load2602803003203403603804004204401s+2d0.00%0.00%0.00%0.00%0.00%0.00%0.00%0.00%0.00%0.00%1s+1d2d4.35%4.67%2.74%4.16%0.00%0.00%0.00%0.00%0.00%0.00%1s+2d2d4.49%8.08%6.21%7.74%4.67%5.12%10.74%3.21%2.15%1.24%1s+2d3d3.10%10.25%4.78%1.22%1.65%2.26%12.34%3.09%0.50%0.70%Load Spectrum of Triple Axl
7、es (Table 4)Axle Load60901201501802102402703001s+1d3d1.49%7.46%0.00%0.00%4.48%10.45%10.45%14.93%13.43%1s+2d3d0.00%0.00%0.00%3.95%0.00%7.89%6.58%10.53%15.79%Axle Load3303603904204504805105405701s+1d3d16.42%5.97%1.49%4.48%0.00%2.99%0.00%0.00%2.99%1s+2d3d23.68%7.89%3.95%6.58%1.32%0.00%2.62%5.26%0.00%Ax
8、le Load6006306606907207507801s+1d3d1.49%0.00%1.48%0.00%0.00%0.00%0.00%1s+2d3d0.00%0.00%1.32%1.32%0.00%0.00%1.32%2.2.2 ESALESAL (Table 5)Conversion IndexSingle Axle with Single TireSingle Axle with Dual TireTandem Axles with Dual TireTriple Axles with Dual TireTotal1s1d1s+2d1s+1d2d1s+2d2d1s+2d3d1s+1d
9、3d1s+2d3d4.35498163225095734865474896758536828988633454211430566386597413867829912.2.3 Accumulative traffic volume on the design laneThe analysis period is 15 years and the increasing rates are 8%, 7%, and 5% for the first five years, the second five years, and last five years. The lane coefficient
10、is 0.5.The growth factor can be calculated by For first 5 years:For second 5 years:For third 5 years: Therefore, accumulative traffic volume on the design lane is When design criteria are deflection and tensile stress of asphalt surface courseWhen design criteria are tensile stress at the semi-rigid
11、 base2.2.4 Traffic LevelBecause, the traffic level is extremely heavy.2.3Subgrade ModulusFor embankment,Step1: Determining critical heightBecause the Natural Zone is II2, and Step2: Determination of Average Roadbed ConsistencyBecause the subgrade soil is clayey soil and the distance between the wate
12、r table and the roadbed surface is 2.7m, subgrade humidity is dry-wet or moderate wet and . Therefore, wc=(1.1+0.95)/2=1.025 and assume .Step3: Estimating Subgrade MR design valueFrom the table, MR is 28MPa.Since the TLU result is 2035% lower, therefore, the final MR=28*1.2=33.6MPaBecause the traffi
13、c level is extremely heavy and subgrade modulus must be larger than 40MPa. So, MR is 40MPa.For cut,Step1: Determining critical heightBecause the Natural Zone is II2, and Step2: Determination of Average Roadbed ConsistencyBecause the subgrade soil is clayey soil and the distance between the water table and the roadbed surface is 1.6m, subgrade humidity is wet and . Therefore, and assume .Step3: Estimating Subgrade MR design valueFrom the table, MR is 22.5MPa.Since the TLU result is 2035% lower, therefore, the final MR=22.5*1.2=27MPaBecause the traffi
