ABSTRACT

To analyse the feasibility of the low-grade highway as a launch site in military applications and improve the pavement crushing technology in civilian applications, this study investigates the evolution characteristics of a low-grade highway under impact load, including deflection, crack, and energy, via the continuum–discontinuum element method (CDEM). To this end, this paper proposes an energy statistics algorithm, and the correctness is verified. Then, a quarter three-dimensional numerical model of an asphalt concrete highway is established, and the effectiveness of CDEM in simulating the deflection of the highway under impact load is validated. Finally, an existing asphalt concrete highway structure is selected to study the evolution characteristics via numerical simulation. The results demonstrate the consistency between the variations of deflection at the load centre and the impact load. The deflection is primarily caused by the compressive deformation of subgrade. Crack planes mainly occur when the impact load increases rapidly. The variation of various constituent energies is different but closely related to the change in impact load.

摘要

为分析低等级公路作为发射场在军事应用中的可行性，并改进路面破碎技术在民用应用中，本研究研究了低等级公路在冲击载荷下的变形特征，包括挠度、裂缝和能量。 ，通过连续-不连续元法（CDEM）。为此，本文提出了一种能量统计算法，并验证了其正确性。然后，建立了沥青混凝土公路的四分之一三维数值模型，验证了CDEM在模拟冲击荷载作用下公路挠度的有效性。最后，选择现有的沥青混凝土公路结构，通过数值模拟研究其演化特征。结果表明载荷中心的挠度变化与冲击载荷之间的一致性。挠度主要是由路基的压缩变形引起的。裂纹面主要发生在冲击载荷迅速增加时。各种成分能量的变化是不同的，但与冲击载荷的变化密切相关。