水平荷载作用下半刚性基层沥青混凝土路面开裂的扩展

Crack Extension of Semi Rigid Base Asphalt Concrete Pavement under Horizontal Load

采用三维有限元方法,对半刚性基层沥青混凝土路面在水平荷载作用下开裂情况进行了分析,研究了水平荷栽作用不同时半刚性基层沥青混凝土路面结构的力学响应规律,分析了半刚性基层厚度和土基模量对水平荷载产生应力的影响。结果表明:水平荷载加载后,在0≤μ≤0.3,路面结构的最大剪应力τmax峰值和最大拉应力σ1峰值的变化较小,μ>0.3,两值有明显增加。水平荷载大小对路面结构τmax峰值的影响主要集中在路面上部,在μ为0.3时,τmax在路表出现;在基层深处,水平荷载的影响较小;土基模量水平荷载所施加的力主要集中在路面结构层上部,在一定深度以后水平荷载所施加的影响甚微。

The three-dimensional finite element method in this paper, has carried on the analysis to the cracking of semi-rigid base asphalt concrete pavement under the action of horizontal load,calculated at different levels of loading mechanics of semi-rigid base asphalt concrete pavement structure response rules,analysis of the semi-rigid base thickness and sub-grade modulus of horizontal load produced the effect of stress. The results show that the horizontal loading, At is 0 ≤μ≤0.3 ,pavement structure of maximum shear stress sigma σ1 peak and the maximum tensile force τmax Max peak changed little ; At isμ〉 0.3 ,two values increased significantly. The effect of horizontal loads on pavement structure tau Max peak is mainly concentrated on the upper part of the road surface,the closer to the road surface, the greater the effeet of the horizontal force. At isμ smaller than 0.3 and τmax Max peak in the table ; in the depths of the grassroots, horizontal load has little effect ; horizontal load of sub-grade modulus of the applied foree mainly concentrated in the upper layers of pavement structure,the horizontal loads imposed by the little effeet in certain depth.