黑龙江交通科技

为探究多种因素对季冻区路基力学性能的影响机制，并量化各因素在实际工程中的作用程度，选取弹性模量、最大水平拉应力、最大水平拉应变、应力比及协调应变能系数等关键力学指标，系统分析了冻融循环次数、初始干密度、初始含水率以及温度变化范围等因素对路面结构响应的影响规律。研究结果表明，冻融循环次数对路面力学性能的影响最为显著，各因素影响权重排序由大到小依次为冻融循环次数、初始干密度、温度、初始含水率。在不同围压条件下，上述影响趋势基本一致；随着围压增大，冻融循环与温度的影响逐渐减弱，而初始干密度的作用愈发突出；温度的影响则呈现出“先增强后减弱”的非线性变化特征。此外，基层底部的应力与应变响应较面层底部更为敏感，其变化幅度更大。进一步发现，应力比数值越小，对整体力学性能的扰动越大，说明其影响更为显著。

In order to deeply investigate the influence mechanism of various factors on the mechanical properties of pavements in the seasonal freezing zone, and to quantify the role of each factor in the actual engineering, selecting key mechanical indexes such as modulus of elasticity, maximum horizontal tensile stress, maximum horizontal tensile strain, stress ratio, and coordinated strain energy coefficient, and systematically analyzes the influence law of the number of freezing and thawing cycles, the initial dry density, the initial moisture content, and the range of temperature change on the structural response of the pavement. The results show that the number of freeze-thaw cycles has the most significant influence on the mechanical properties of the pavement, and the order of the influence of each factor, from highest to lowest, are as follows: the number of freeze-thaw cycles, the initial dry density, the temperature, the initial water content. Under different pressure conditions, the above influence trends are basically the same; with the increase of pressure, the influence of freezing and thawing cycles and temperature is gradually weakened, while the role of initial dry density is more and more prominent; the influence of temperature shows a nonlinear change of “first enhancement and then weakening” characteristics. In addition, the stress and strain responses at the bottom of the base layer were more sensitive than those at the bottom of the surface layer, and the magnitude of the changes was larger. It is further found that the smaller the value of stress ratio is, the greater the perturbation on the overall mechanical properties, indicating that its influence is more significant.