土工织物延缓沥青路面疲劳型反射裂缝的有限元分析  

FEM Analysis of Mitigating Fatigue-Induced Reflective Cracking in Asphalt Pavements Using Geotextiles

作　　者：苗英豪[1] 赵恩强[1] 王书云[1] 张金喜[1] 

机构地区：[1]北京工业大学交通研究中心,北京100124

出　　处：《北京工业大学学报》2009年第6期790-795,共6页Journal of Beijing University of Technology

基　　金：北京工业大学博士科研启动基金资助项目(52004011200702)

摘　　要：为定量研究土工织物对沥青路面疲劳型反射裂缝的防治效果,利用有限元方法,分析了土工织物对沥青路面内部应力应变分布的影响以及土工织物内应力应变的状况,进而对加铺土工织物后沥青面层疲劳寿命的变化进行了定量研究.土工织物的加入有效降低了沥青面层层底拉应力,从而延长了沥青面层的疲劳寿命,土工织物弹性模量越大,应力降低值越大,沥青面层的疲劳寿命延长率越高;位于基层裂缝上部的土工织物内部应力分布范围约为12 cm,且应力值远小于其抗拉强度.研究表明,利用土工织物防治疲劳型反射裂缝是一种有效的方法,工程中应以土工织物可能承受的最大拉应力对应的弹性模量为依据,选择模量较大的材料.To quantitatively analyze mitigation of fatigue-induced reflective cracking in asphalt pavement through geotextiles, impact of geotextile on stress and strain distribution in asphalt layer, stress and strain distribution in geotextile were calculated using FEM. Then variety in fatigue life of pavement was quantitatively researched. Fatigue life of asphalt layer is extended because tensile stress in bottoms of asphalt layer is reduced prominently by geotextile. The bigger geotextile elastic modulus is, the more tensile stress in bottoms of asphalt layer reduces, and the longer fatigue life of pavement extends. Stress distributes over about 12cm in geotextile above base crack, and the magnitude of stress is far lower than geotextile tensile strength. It is an effective method to use geotextile for mitigating fatigue-induced reflective cracking in asphalt pavement. In practice, elastic modulus corresponding with the potential maximum stress should be considered when choosing getextile.

关 键 词：道路工程 沥青路面 土工织物 反射裂缝 

分 类 号：U416.2[交通运输工程—道路与铁道工程]