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应用数值计算的方法和冲击韧性试验研究在行车载荷作用下土工合成材料加铺层对含反射裂缝沥青混凝土路面的抗裂效果,并对土工合成材料弹性模量进行了优化设计。分析了温度、时间和加铺层弹性模量对裂缝延长线上各点正应力和面层层底拉应力的影响;应用冲击韧性试验系统评价了土工合成材料加铺层的抗裂效果。数值计算与冲击韧性试验结果基本一致。研究结果表明:铺设土工合成材料是防治反射裂缝的有效途径,能有效地改变结构的应力分布,更大程度地减少了应力集中;同时确定最佳的土工布加铺层的弹性模量为1 000 MPa;但加铺层对含裂缝沥青混凝土路面的路表弯沉基本没有影响。
The numerical method and the impact toughness test are used to study the anti-cracking effect of the geosynthetic overlay on reflective asphalt concrete pavement under the driving load. The elastic modulus of the geosynthetic material is optimized. The influence of temperature, time and the elastic modulus of the overlay on the normal stress at each point and the tensile stress of the overlay were analyzed. The impact toughness of the overlay with geosynthetics was evaluated by the impact toughness test system. Numerical calculation and impact toughness test results are basically the same. The results show that the laying of geosynthetics is an effective way to prevent reflection cracks, which can effectively change the stress distribution in the structure and reduce the stress concentration to a greater extent. At the same time, the optimal geosynthetic overlay elastic modulus is 1 000 MPa; However, overburden on the cracked asphalt pavement road surface deflection basically no effect.