含初始裂缝水泥混凝土路面对冲击荷载响应分析

冲击荷载对水泥混凝土路面的破坏与普通交通荷载有很大不同。采用数值模拟方法，探索了冲击荷载作用下面层具有不同初始裂缝长度和位置的水泥混凝土路面的动态响应特性。研究发现水泥混凝土路面最终扩展的裂缝长度和沉降随初始裂缝长度的增加而增大，随初始裂缝与荷载作用中心距离的增加而减小。当初始裂缝长度与面层厚度的比超过某一值时，水泥混凝土路面会产生贯穿性的裂缝。初始裂缝长度的不同主要影响的是面层以下约5倍水泥混凝土面层厚度范围内石灰土和黄土的压缩变形。初始裂缝长度和位置的不同对荷载作用中心1 m范围内水泥混凝土路面的沉降有较显著的影响。 

Dynamic analysis on cement concrete pavement with initial cracks under impact loading

The effects of impact loading on the failure of cement concrete pavement are significantly different from those of traffic loading. This paper investigates the characterization of cement concrete pavement with varied initial crack length and location under impact loading. It is found that the final crack length and settlement generated in the pavement increase with the increase of the initial crack length and decrease with the increase of the distance between the initial crack and the loading center. The penetrating crack is produced when the the ratio of the initial crack length of the pavement to the surface layer thickness exceeds one certain value. The deformation of limestone and loess layer below the surface layer and in the range of about 5 times thickness of cement concrete layer is affected greatly by the initial crack length. The initial crack length and location play a significant role on the settlement of cement concrete pavement within 1 m distance from the loading center.