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为了研究路基变形模量及反力系数在弹性领域内的非线性特性,应用无砟轨道路基基床模型和现场试验,分析了在分级静载和分级循环加载条件下,降雨前、后基床的静态、动态特性.研究结果表明:无论是静态响应还是动态响应,在基床横断面方向上均呈马鞍形分布,混凝土基础板轨下位置响应最大,中线处和端部响应较小;在基床表层范围内,动态响应最为强烈,随深度的增加,在基床表层范围内衰减较快,在基床底层范围内衰减较慢;与降雨前相比,降雨后静应力的最大增量为12%左右、动应力的最大增量为3%左右、加速度的最大增量为35%、动位移的最大增量为13%左右,因此应充分重视路基的防排水措施.
In order to study the nonlinear characteristics of subgrade modulus and reaction coefficient in the elastic field, based on the ballastless subgrade bed model and field test, the effects of subgrade loading, The results show that both the static response and the dynamic response show a saddle-shaped distribution in the cross-sectional direction of the foundation bed, the position under the concrete foundation slab track has the highest response, and the response at the middle line and the end part is small. The dynamic response is the most intense within the surface layer of the bedrock. With the increase of depth, it decays more rapidly in the surface layer of the bedrock and declines slowly in the bottom layer of the bedrock. Compared with before rainfall, the maximum increment of static stress after rainfall Is about 12%, the maximum increment of dynamic stress is about 3%, the maximum increment of acceleration is 35% and the maximum increment of dynamic displacement is about 13%. Therefore, the waterproof and drainage measures of roadbed should be fully taken into account.