CAJ | 학술논문

通过系统的参数分析,探明了影响路基应力的主要因素,并确定了相应参数在模型中的取值,以此建立三维有限元分析模型.采用该模型对典型水泥混凝土路面结构的荷载应力进行计算,分析了轴重与轴型对路基应力计算深度和荷载应力分布的影响.结果表明,随着轴重和轴数的增加,路基应力计算深度不断扩展,该范围内的应力级位也不断提高;多轴荷载应力的叠加效应在路基深层愈加显著.通过叠加自重应力获得路基中的应力状态,经统计分析表明,路基主应力覆盖范围为30 kPa<σ1<90 kPa,10 kPa<σ3<40 kPa,主应力比的变化范围为1.9～6.0.当轴载增加1倍时,路基中的应力级位约提高10 kPa.这将对路基性能造成显著影响,因而在路面结构设计中应予以考虑.
통과계통적삼수분석,탐명료영향로기응력적주요인소,병학정료상응삼수재모형중적취치,이차건립삼유유한원분석모형.채용해모형대전형수니혼응토로면결구적하재응력진행계산,분석료축중여축형대로기응력계산심도화하재응력분포적영향.결과표명,수착축중화축수적증가,로기응력계산심도불단확전,해범위내적응력급위야불단제고;다축하재응력적첩가효응재로기심층유가현저.통과첩가자중응력획득로기중적응력상태,경통계분석표명,로기주응력복개범위위30 kPa<σ1<90 kPa,10 kPa<σ3<40 kPa,주응력비적변화범위위1.9～6.0.당축재증가1배시,로기중적응력급위약제고10 kPa.저장대로기성능조성현저영향,인이재로면결구설계중응여이고필.
Factors affecting the stress level of subgrade were investigated through systemic parameter analysis,and then a 3D finite element model was established and used for load stress analysis.For typical cement concrete pavement structure,the stress of subgrade was calculated under all kinds of gear weights and configurations.Analysis result indicates that the subgrade workaround is deepened and the stress level in the region is raised with the increasing of the gear weight and the number of axis.The stress induced by multi-axis was overlapped in the deep-seated subgrade.The stress state of subgrade was calculated by adding the at-rest pressure to the load stress which was computed by finite element analysis.The statistical result of stress state illustrates that the maximum and minimum principal stress range in 30～70 kPa and 10～40 kPa respectively,and the principal stress ration is fluctuated between 1.9 and 6.0.The magnitude of stress in subgrade is increased by 10 kPa when the applied load enhances from 100 kN to 200 kN,which impacts the mechanical behavior of subgrade dramatically.Thus,it is needed to consider the stress-dependent behavior of subgrade in pavement design.