【正文】 公路工程技術標準 [S](中文 )。這種方法是將提供一個指導設計的瀝青路面結構在農村地區(qū) 參考文獻 [1]G L,張元 F、陳年代 W,吳昱。 （ 1)當累計頻率的等效軸重在 500000 次 /年 ,處理過的瀝青或瀝青 滲透表面厚度為 cm 一 4cm 被推薦用于路面。它也是的變形情況依法成立的路面累計的等效軸重估計越過一條小巷設計壽命的預期 ,道路類型、道路分類 ,和類型的路面12 和基層。從上面的討論 ,我們可以得出結論 :最敏感層底基層路面位移 ,第二是基層。當路面的厚度達到一定值時 ,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構通過增加厚度的路面。這一結論表明 ,路基強度分類是合理的、適用于設計與施工的瀝青路面結構。 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 。 人行道撓度 和 底部的 拉 應力作為瀝青路面設計參數(shù)。一個 平常 縣的道路 ， 交通 量平均為 的 300至 1500 輛 / 天； 一個經濟發(fā)達 的縣 ,已經達到了 1000 到 2020 輛 / 天 。與其他國家相比 ,在中國農村地區(qū)交通組成有其自身的特征 . 因此 ,沒有 足夠 經驗對農村公路建設提供參考依據(jù)。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 0002 000 000 times per lane， asphalt concrete road surface of 5 cm7 cm thick is remended. For various accumulative equivalent axle loads and moduli(Eo)of roadbed , the equivalent thickness of roadbase is shown in ， Ld is the designed deflection, Lo is the representative deflection of roadbed， E, is the modulus of resilience of the roadbase， in MPa , Eo is the modulus of resilience of the roadbed，in MPa ,and H, in cm， is the equivalent thickness of the base (roadbase and subbase)， which can be obtained through calculation and insite investigation for a trilevelpavement roads(including road surface， base and roadbed).If a designed road has four layers， . a subbase is added， according to the regression analysis of the extrapolated results of a number of multilayer flexible systems and the available research findings， the thickness of the roadbase , h,， in cm, can be calculated from the following equation: 6 Concluding Remarks Compared with concrete pavement, asphalt pavements have a lower 8 construction cost, which is suitable for the roads in relatively underdeveloped rural areas in China. The research in this paper proposed a method for structural design of low cost asphalt pavements. The method is to provide an guideline for the design of asphalt pavement structure in rural areas. References [1]Yuan G L , Zhang F , Chen S W , et al. Research on technical indexes of rural highway construction in Jiangsu province [ J ].Highway, 2020(6):135 一 139(in Chinese).