Mechanical responses of base cracking in semi-rigid pavement
Mechanical responses of base cracking in semi-rigid pavement
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发表时间：
2006
影响因子：
1.5
通讯作者：
Ren Xian-yong
中科院分区：
文献类型：
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作者：
Ren Xian-yong
利用有限元方法分析了半刚性路面基层开裂后的力学响应，研究认为，路面弯沉不能准确反映半刚性路面结构的破坏状况，基层开裂后，沥青路面的破坏主要受剪应力控制，纵向拉应力、基底开裂两侧剪应力迅速增大;并造成交叉点底座两侧形成严重破坏。它留下了严重的隐患，在交叉点处的板底会形成水毁空间逃逸，然后引起面层沿着横缝两侧的开裂和沉降。在基层中，各层的纵向开裂，不仅使裂缝进一步向上层扩展，进而引起路面结构的整体纵向开裂，而且为疲劳断裂创造了条件，当基底构造板块尺寸大于临界尺寸1 m×1 m时，当基层构造板尺寸小于此值时，路面结构的应力应变状态趋于柔性路面。
Utilizing the finite element method,the mechanical responses of base cracking in semi-rigid pavement are analyzed.The research believed that the road surface deflection cannot accurately reflect the destruction condition of the semi-rigid pavement structure.After the crosswise cracking of the base,the bituminous pavement destruction is mainly controlled by the shearing stress.The longitudinal tensile stresses,shearing stress of the two sides of the base cracking rapidly increase;and cause the two sides of the cross-oint base to form the serious destruction.It has left behind the serious hidden danger,which will form the water damage to escape spatially in the board bottom of the cross joint place,then cause cracking and settlement of the surface layer along the two sides of the cross-joint.In the base,the longitudinal cracking of each level,not only causes the cracking further to expand to the upper formation,then causes the overall longitudinal cracking of the pavement structure,but also creates the condition for the crosswise weary fracture.When the size of the base tectonic plate is bigger than the critical dimension 1 m×1 m,the structure still belongs to the semi-rigid pavement.When the size of the base tectonic plate is smaller than this value,the stress and strain conditions of the pavement structure tend to belong in the flexible pavement.