摘要
采基于路基路面协调变形,建立三维有限元分析模型,并对典型水泥混凝土路面结构的荷载应力进行计算。采用正交试验设计的方法对路面设计参数进行组合,系统分析了设计参数对路基路面应力响应的影响。结果表明,对于水泥混凝土路面,在路面设计参数中,仅有路基回弹模量对路面板拉应力与面层板厚度对路基应力具有显著影响。因此,可将路面厚度和路基回弹模量设计作为水泥混凝土路面设计重点。基于不同路面板厚度下路基工作区深度,可将交通荷载影响区加深至1.5 m。基于不同路面板厚度、路基回弹模量和不同轴载对水泥混凝土路面板疲劳寿命影响规律,在重载交通条件下,应该增加路面厚度和增强路基。考虑经济因素并结合以上分析,建议水泥混凝土路面厚度宜取28～30 cm,路基回弹模量宜介于40～80 MPa之间。
Base the principle of coordinate deformation, the 3D finite element models were estab- lished and used for load stress analysis of typical cement concrete pavement structure. The designing pa- rameter combinations were established with orthogonal design？ method. The effects of designing parame- ter on the stress responses of subgrade and pavement？ were systematically analyzed. For cement concrete pavement,within the pavement design parameters,, the results indicate that only the subgrade resilient modulus and slab thickness had a significant influence on tensile stresses of the slab and stress responses of subgrade eorrespondly. Therefore, the design of slab thickness and subgrade resilient modulus can be regard as the focus of the cement concrete pavement design. According to the depth of subgrade work- space under different slab thickness, the subgrade workspaee depth of expressway can be 1.5 meters. Under heavy traffic, based on the fatigue life influence law of cement concrete pavement slab under differ- ent slab thickness and subgrade resilient modulus and gear weight, the slab thickness should be increased and the subgrade should be enhanced. From the economic point of view and in combination of the above analysis,the optimal cement slab thickness can be between 28 -30 centimeters and the reasonable sub- grade resilient modulus can be 40 ~ 80 MPa.
出处
《公路工程》
北大核心
2012年第5期130-134,共5页
Highway Engineering
基金
交通部西部交通建设科技项目(2011318785760
2009318785104
200731822301-3)
关键词
道路工程
板厚设计
有限元
路基工作区
协调变形
正交试验
road engineering
slab thickness design
finite element analysis
subgrade work-space
coordinate deformation
orthogonal design
