路基土湿度对路面结构的影响及处理措施研究

摘要

运营期间,路基土体的含水量常常大于施工时的控制含水量,因此处于潮湿或过湿状态,从而导致路基变软而引起路面结构破坏.利用弹性层状理论对漯河市农村公路常用路面结构进行了计算,结果表明,路基土体如湿度过大将会显著增大路面弯沉值和底基层内的拉应力,铺设灰土垫层则有助于减小这些指标,改善路基稳定性.分析了灰土垫层模量和垫层厚度的影响,建议了垫层的合理处理厚度.%The subgrade of road in service is potentially in wet or over-wet state since its moisture is sometimes much greater than that in construction period.This makes the subgrade soften and then the pavement structure layers are possibly destroyed.The elastic layer system theory is introduced to compute the deformation and stress in the pavement structure layers of rural roads in Luohe.The computed results show that the pavement deflection and the tensile stress in its sub-base will increase with the increase of moisture of subgrade soil,and decrease if the lime-soil cushion is set up.The thickness of the latter is proposed by discussing the effects of its modulus of resilience and thickness on pavement structure.