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作 者:朱明哲 余云燕[1] 王堃[1] ZHU Ming-zhe;YU Yun-yan;WANG Kun(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)
机构地区:[1]兰州交通大学土木工程学院,兰州市730070
出 处:《公路》2021年第12期23-31,共9页Highway
基 金:兰州市科技计划项目,项目编号2018-4-33。
摘 要:基于动力学与断裂力学理论,利用有限元ABAQUS对G6京藏高速公路兰海段含多裂缝的典型路段进行动态疲劳破坏机理分析。以应力强度因子为表征参量,探究以红层泥岩土作为特殊路基填料时,各层间裂缝在循环荷载作用下的动力响应,分析裂缝尖端应力的发展规律。结果表明:各层间裂缝的发展可归纳为迅速发展和稳定扩展两个阶段,裂缝尖端至顶面的应力传递效应明显;红层泥岩土的刚度衰减效应对于应力强度因子的发展存在催化作用。Based on the theory of dynamics and fracture mechanics, the finite element Abaqus is used to analyze the dynamic fatigue failure mechanism of the typical section with multiple cracks on the Lanzhou-Haikou section of the G6 Beijing-Tibet Expressway. Using the stress intensity factor as the characterizing parameter, the dynamic response of the cracks between the layers under cyclic loading when the red mudstone soil being the special roadbed filler is explored, and the development law of the stress at the crack tip is analyzed. The results show that the development of cracks between layers can be summarized into two stages: rapid development and stable expansion. The stiffness attenuation effect of the red mudstone soil has played an obvious catalytic effect, and the stress transfer effect from the crack tip to the top surface is obvious.
分 类 号:U416.217[交通运输工程—道路与铁道工程] U418.6
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