沥青面层层间粘结状况对水损坏的影响分析

假设各路面结构层处在光滑和连续状况下,采用BISAR 3.0程序,计算了8种不同层间粘结状况下沥青路面结构的受力情况,分析不同层间粘结状况对路面结构受力的影响。计算结果表明,只要沥青面层内部存在层间的不连续,会在相应部位产生拉应力和剪应力集中,使得该部位的路面结构受力状况非常恶劣;同时,水分易于进入层间薄弱带,沥青面层内部的储水加上各项应力在此集中加剧了沥青路面水损坏的发展,致使水损坏的路面出现了层间断开的现象。

Influence of Adhesion between Asphalt Pavement Layers on Water Damages

The status of adhesion between asphalt layers affects the development of water damages.Based on the hypothesis of the roughness and smoothness between the two asphalt layers.Through drilling core investigation of a highway,it is found that there are disconnection between asphalt layers in water damage spots and weakness zone at the bottom of asphalt layers.Using BISAR 3.0 program,the stress statuses of asphalt pavement under eight different adhesions between layers were calculated.Conclusions are drawn that if there are discontinuity in asphalt pavement,the stress and shearing strength would centralize at a point,and water would be prone to filter into the weakness zone,thus deteriorate water damages in asphalt pavement and bring out disconnection between asphalt layers.