林区公路的路面,一般为中级和低级路面。因路面是直接承受荷重,也起抗压作用,并将荷重传受于路基。其铺筑厚度与路基土壤容许应力成反比,路基土壤容许应力越大,同样材料的路面厚度就越少,路基容许应力的数值是根据土壤类别、压实程度、水文地质、温度条件、潜水水位和土壤的化学成份而定,并由土壤的抗压强度来决定。故路面设计厚度,也可按抗压强度系数来计算。如路基抗压强度等于或大 The road surface of forest roads, generally intermediate and low-grade pavement. Because the road is directly bear the load, but also from the compressive effect, and load transmitted by roadbed. The pavement thickness is inversely proportional to the allowable soil subgrade stress. The greater the permissible stress of subgrade soil, the less the pavement thickness of the same material. The subgrade allowable stress values ​​are based on soil type, degree of compaction, hydrogeology, temperature conditions, It depends on the chemical composition of the soil and is determined by the compressive strength of the soil. Therefore, the thickness of the road design, but also by compressive strength coefficient to calculate. If the subgrade compressive strength is equal to or greater