冲击压实旧混凝土路面路基的力学行为研究

Analysis on mechanical behaviors of existing cement-concrete pavement and soil subgrade in the process of impact compaction

结合新型冲击压实技术在旧水泥混凝土路面修复工程中的应用,采用三维有限元方法研究了冲击压实过程中旧路面结构及土基的受力、变形特征。分析了冲击压实荷载位于路面板不同位置时对板体破裂及土基受压效果的影响,探讨了冲击压实荷载在板下路基中的传递规律及作用深度等问题。研究结果对于冲击压实旧水泥混凝土路面机理分析及现场施工具有一定的参考价值。

Taking cracking and seating the existing cement concrete pavement with impact compaction technology on rehabilitation project as an example, the stress and deformation characteristics of the existing pavement structures and their soil subgrade in the process of impact compaction are studied using the three dimensional finite element method. Different locations of impact load on the pavement slab in the process are simulated and their mechanical behaviors for cracking and seating the slab and for compacting the soil subgrade are revealed. The relationships between the stress caused by impact load and the depth in soil subgrade are discussed. The scope of depth affected by impact load is proposed. The results obtained in this paper are helpful to the impact compaction practice on site and to the study on the mechanism of cracking and seating brought with impact compaction.