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对季冻区路基路面的力学性能进行相关研究。测试不同深度位置处路基土体的含水量,并对路基土体回弹模量的影响因素进行试验分析,探讨了不同路基含水量下的路面结构力学响应情况。结果表明:冻融循环明显降低土体的强度,但到第6次冻融循环后,土体的强度基本趋于平稳;随着含水量的增加,土体强度减小的趋势逐渐变缓,因此,冻融循环作用对较为干燥状态土体的影响是较大的;路表弯沉、半刚性基层层底拉应力和土基顶压应变与路基含水量及轴载呈正相关关系,其中与轴载近似呈线性关系。沥青层层底拉应变远远低于疲劳极限,因此发生疲劳损伤的概率很小;随着轴载的增加,半刚性基层疲劳寿命逐渐减小,趋势逐渐变缓,含水量增加时半刚性基层疲劳寿命有类似的变化规律,因此为降低半刚性基层发生疲劳破坏的概率,需严格控制土基的含水量及行车荷载。
The research on the mechanical properties of subgrade and quarry in quaternary area is carried out. The water content of subgrade soil at different depths was tested. The influencing factors of subgrade soil elastic modulus were tested and analyzed, and the mechanical response of pavement under different subgrade moisture content was discussed. The results showed that the freezing and thawing cycles significantly reduced the soil strength, but the soil strength tended to be stable after the sixth freeze-thaw cycle. With the increase of water content, the soil strength decreased slowly, Therefore, the effects of freeze-thaw cycles on the soil in relatively dry conditions are larger. The deflection of the road surface, the tensile stress at the bottom of semi-rigid base and the top soil compressive strain have a positive correlation with water content and axial load of subgrade, Axial load is approximately linear. The tensile strain at the bottom of asphalt layer is far below the fatigue limit, so the probability of fatigue damage is very small. With the increase of axial load, the fatigue life of semi-rigid base gradually decreases and the trend gradually becomes softer. When the water content increases, the semi- Similar fatigue life changes, so to reduce the probability of fatigue damage to the semi-rigid base, the need to strictly control the water content of soil and traffic load.