摘要
通过有限元软件,模拟分析公路路面结构的力学性能,研究了建筑工程垃圾在公路路基中的力学性能。结果表明,在超载车辆反复下,疲劳荷载会使面层底面出现剪切破坏。当建筑垃圾底基层刚度为1005MPa时,各层应力最大值是刚度为705MPa时的0.73~0.91倍。在荷载为标准荷载的一倍时,结构底基层先受压产生裂缝,裂缝随后向上不断扩展引起路面破坏。在标准荷载作用下,路表弯沉值随着建筑垃圾路基刚度值的增长而减小,在建筑垃圾路基刚度为175MPa时,路表弯沉值为0.140mm,125MPa时为0.152mm。基层及面层的剪应力随建筑垃圾路基刚度的增大而减小。当建筑垃圾路基刚度分别处于125和175MPa时,后者的应力最大值是前者的0.54~0.92倍。也就是说,对建筑垃圾路基刚度进行增强,能够有效改善路面结构抗拉能力。
In this paper,the mechanical properties of highway pavement structure are simulated and analyzed by finite element software,and the mechanical properties of construction waste in highway subgrade are studied.The results show that under repeated overloading vehicles,fatigue load will cause shear failure at the bottom of the surface layer.When the stiffness of base course of construction waste is 1005 MPa,the maximum stress of each layer is 0.73~0.91 times that of 705 MPa.When the load is twice that of the standard load,the cracks first appear in the base of the structure under compression,and then the cracks continue to expand upward,causing pavement damage.Under standard load,the surface deflection decreases with the increase of the stiffness value of the construction waste subgrade.When the stiffness of the construction waste subgrade is 175 MPa,the surface deflection value is 0.140 mm and 0.152 mm at 125 MPa.The shear stress of base and surface decreases with the increase of stiffness of construction waste subgrade.When the stiffness of construction waste roadbed is 175 MPa,the maximum stress of each layer is 0.54-0.92 times that of 125 MPa.Therefore,the improvement of tensile capacity of pavement structure can be realized by improving the stiffness of construction waste subgrade.
作者
王蒙
王双晨
WANG Meng;WANG Shuangchen(Hebei Polytechnic Instiute,Shijiazhuang,Hebei 050091,China;Chongqing Architectural Design Institute of China,Chongqing 400010,China)
出处
《公路工程》
北大核心
2019年第4期285-290,共6页
Highway Engineering
关键词
有限元
建筑垃圾
公路路基
刚度
荷载
finite element
construction waste
highway roadbed
stiffness
load
