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差异沉降段沥青混凝土路面的疲劳模拟与寿命预估

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Indexed by:期刊论文

Date of Publication:2014-04-25

Journal:公路

Included Journals:PKU、ISTIC

Issue:04

Page Number:1-5

ISSN No.:0451-0712

Key Words:沥青混合料;差异沉降;疲劳开裂;板式试件;疲劳寿命

Abstract:采用两对边简支条件下沥青混凝土板弯曲疲劳试验,模拟差异沉降段沥青混凝土路面的受力状态,研究回填不良对路面结构疲劳寿命的影响。采用往复移动的试验轮模拟移动荷载,使对边简支的板式试件内产生弯拉应力,测定裂缝发展到试件边缘时的疲劳寿命。通过有限元方法,计算常规路段和差异沉降段的弯拉应力。板式试件疲劳试验显示了以横向为主的裂缝分布,这与回填不良区段路面的开裂规律相吻合。结合弯拉应力和板式试件疲劳方程可知,在85%压实度下,沉降区路面疲劳寿命折减为常规路段的13%。文中对差异沉降段开裂现象的研究,有助于对此类病害的预防和处治。

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