超孔隙水压对沥青混凝土的影响  

The Influence of Super - void Water Pressure to Asphalt Concrete

作　　者：李之达[1,2] 沈成武[2] 周增国[2] 黄豪[2] 雷建平[2] 黄靖[2] 

机构地区：[1]华中科技大学力学系,武汉430074 [2]武汉理工大学交通学院,武汉430063

出　　处：《湘潭大学自然科学学报》2003年第4期98-109,共12页Natural Science Journal of Xiangtan University

基　　金：湖北省交通厅重点科技项目(鄂交科教[2002]466号)

摘　　要：研究了沥青混凝土路面水损害.通过对超孔隙水压的分析和疲劳试验研究,探讨了空隙水对路面结构的破坏形式和疲劳寿命的影响.超孔隙水压的有限元计算表明,在车载作用下将产生较高的孔隙水压力,对沥青面层形成冲刷,最终可能导致各种路面水损害;超孔隙水压对沥青混凝土的影响实验和分析证实,超孔隙水压改变沥青混凝土的破坏形式,在无水状态下疲劳破坏的形式为劈裂状,而在有水状态疲劳破坏的形式则主要表现为剪切破坏;有水状态的抗疲劳强度较无水状态的抗疲劳强度低;经回归分析,得到了沥青混凝土在有水状态和无水状态下的抗疲劳寿命估计方程,而且与实验有很好的吻合;进一步证实了沥青路面在车载下的超孔隙水压是引起早期水损坏的重要因素.In this paper, we researched the water- induced distress of asphalt concrete pavement. Through analysis and fatigue test research to the super - void - water pressure, there is a new cognition that is the failure form and the influence in life of pavement structure by void - water. The finite element calculation expresses that there will product a higher void - water pressure under traffic load, it will flush to the asphalt layer, in the end it will cause kinds of water -induced distress. The test and analysis prove that the super - void - water pressure would change the broken form of asphalt concrete, the fatigue failure form is split under the appearance without water, but the failure fatigue form performance in main is shear failure under the appearance with water. There is a lower fatigue strength under the appearance with water than without water. After the regression analysis , we can get the failure strength life estimate equation of asphalt concrete under the appearance with and without water, and it is a fit to the test; It is a proof in further that the super - void water pressure under traffic load is an important factor that causes the premature water - induced distress in asphalt pavement.

关 键 词：沥青路面 水损害 超孔隙水压力 疲劳寿命 

分 类 号：O347[理学—固体力学]