水泥混凝土路面板角脱空的有限差分分析

分别对水泥混凝土路面板角脱空的悬臂板模型以及考虑基层缓冲作用的脱空面板进行了有限差分分析。比较了二者的假定条件和计算结果之间的差异,并与传统的结构计算结果作了横向比较。计算结果表明,假定脱空路面板为悬臂板时,由于传统的结构计算方法未考虑荷载的偏心作用,计算结果比有限差分法计算所得的悬臂板模型计算结果要小得多。在考虑基层材料的有限差分计算中,由于基层材料的缓冲作用,板中的拉应力和位移明显减小,但路基土中有一定的拉应力存在,必须设法提高路基土的强度。

Finite difference analysis of a cement concrete slab with a void beneath the slab corner

Using fast lagrangian analysis of continua in 3 dimensions(FLAC3D) which is based on finite difference method(FDM),stresses and displacements of a cement concrete slab with a void beneath the slab corner were obtained.The concrete slab was assumed to be a cantilever slab,and the cushioning effect of the road base was taken into consideration.The hypothesis and the difference of the results computed by FLAC were analyzed.A comparative analysis also was conducted between the FLAC calculations and traditional structural calculations.The results indicate that when the concrete slab is assumed to be a cantilever slab,the values of stress and displacement by traditional methods are quite smaller than those by derived using FLAC 3D because the influence of loading eccentricity is not considered in structural calculation.In the FLAC calculations when the road base cushioning effect is considered,the tensile stresses and displacements in the slab decline.Some tensile stresses appear in subgrade soil,however.Therefore,more efforts should be made to enhance the subgrade soil strength.