【正文】 ral roads include county roads， town roads and village roads. The traffic on rural roads is usually mixed. On a county road, traffic volume is between 300 to 1500 veh/d in average， and in a county with a developed economy， it reaches 1000 to 2 000 veh/d. The traffic volume between county and town is 100 to 300 veh/d， and the traffic volume between towns is usually less than 100 to 300 veh/d. In a mixed traffic flow， trucks account for 40% to 70% of the traffic volume, which are mainly light trucks carrying less than 2. 5 tons(including agricultural vehicles such as electrotricycles， walking tractors etc.)and mediumsize trucks of 2. 5 to 5 tons. Most of these light or medium trucks are overloaded. The proportion of heavy truck is less than 9%.On some roads to counties， the proportion of 2 overloaded trucks is 5% to 32 %， while on some county roads connecting to national or provincial trunk highways， the proportion of overloaded vehicles usually amounts to 20% to 32% . The traffic volume on rural roads is not heavy. However， considering the practical situation in China, as well as the exitence of overloaded vehicles， 100kN， or BZZ100 was adopted as standard axle load in the research. The pavement deflection or the flexuraltensile stress at the bottom of asphalt surface is taken as the design parameter. The axle load was calculated in accordance with the following formula: ?isNN )/( si PPCC 和 the axle weight of an ilevel axle in kN and the action frequency。與其他國家相比 ,在中國農(nóng)村地區(qū)交通組成有其自身的特征 . 因此 ,沒有 足夠 經(jīng)驗(yàn)對農(nóng)村公路建設(shè)提供參考依據(jù)。 人行道撓度 和 底部的 拉 應(yīng)力作為瀝青路面設(shè)計(jì)參數(shù)。這一結(jié)論表明 ,路基強(qiáng)度分類是合理的、適用于設(shè)計(jì)與施工的瀝青路面結(jié)構(gòu)。從上面的討論 ,我們可以得出結(jié)論 :最敏感層底基層路面位移 ,第二是基層。 （ 1)當(dāng)累計(jì)頻率的等效軸重在 500000 次 /年 ,處理過的瀝青或?yàn)r青 滲透表面厚度為 cm 一 4cm 被推薦用于路面。公路工程技術(shù)標(biāo)準(zhǔn) [S](中文 )。這種方法是將提供一個指導(dǎo)設(shè)計(jì)的瀝青路面結(jié)構(gòu)在農(nóng)村地區(qū) 參考文獻(xiàn) [1]G L,張?jiān)?F、陳年代 W,吳昱。它也是的變形情況依法成立的路面累計(jì)的等效軸重估計(jì)越過一條小巷設(shè)計(jì)壽命的預(yù)期 ,道路類型、道路分類 ,和類型的路面12 和基層。當(dāng)路面的厚度達(dá)到一定值時(shí) ,在路面撓度變化并不明顯 ,然后它是無效的承載力提高瀝青路面結(jié)構(gòu)通過增加厚度的路面。 r指的年增長率交通量 η 指系數(shù) ,一個車道 為 為 ,雙車道 為 。一個 平常 縣的道路 ， 交通 量平均為 的 300至 1500 輛 / 天； 一個經(jīng)濟(jì)發(fā)達(dá) 的縣 ,已經(jīng)達(dá)到了 1000 到 2020 輛 / 天 。s service life under lim iting conditions in poor season. Through thoretical analysis and experimental study， the calculation for mulas for the allowable deflection of road surface which are applicable to the pavement structure design of lowcost rural roads are as follows}2}: When designing the asphalt pavement structure of lowcost rural roads, we should use formula (6) or (7 ) according to the types of roadbase to determine the thickness of asphalt pavement structure. Tensile stress Because the asphalt pavement structure of lowcost rural roads is not substantial enough and the heavy vehicles are allowed to pass over them, the maximum tensile stress should be checked by puting the stresses of the semirigid base and subbase. The tensile stress at the bottom of semirigid base or subbase，would be less than or equivalent to the allowable tensile stress of the materials of the semirigid base or subbase , namely， For the stabilized aggregate base with an inorganic binder 7 For the stabilized finegrained soil base with an inorganic binder: Pavement thickness To make it simple and convenient for engineers to determine the desired thickness of rural road pavement, the curves of the thickness of the roadbase of lowcost rural roads according to typical pavement structures and accumulative frequency of equivalent axle load are shown in Figs. 3， 4 and 5. (1)When the accumulative frequency of equivalent axle load is within 500000 times per lane， asphalttreated or asphalt perated surfaces with thickness of 1. 5 cm一 cm is remended for road surface. For various accumulative equivalent axle loads and the moduli(Eo)of roadbed， the equivalent thickness of roadbase is shown in Fig. 3. (2)When the accumulative frequency of equivalent axle load is within 500 001)一 1 000 000 times per lane， asphalt macadam or asphalt concrete with thickness of 3 cm 5 cm is remended. For various accumulative equivalent axle loads and moduli(Eo)of roadbed， the equivalent thickness of roadbase is shown in Fig. 4. (3)When the accumulative frequency of equivalent axle load is within 1000 0