土工格栅加筋碎石土动回弹模量及预估模型试验研究

加筋土路基动回弹模量是加筋土技术在道路工程中的重要设计指标.利用动三轴仪对土工格栅加筋碎石土进行动回弹模量试验,对比分析了含水率、加筋方式、剪切及侧限影响表征量对动回弹模量的影响规律,并回归分析了动回弹模量预估模型参数.研究结果表明:加筋土的动回弹模量随着含水率的提高而降低;土工格栅应布设在土体中的水平剪切变形层位,增...

Experimental analysis on dynamic resilience modulus and prediction model of geogrid reinforced gravel soil

The dynamic resilience modulus of reinforced subgrade is an important design index of reinforced soil techniques in road engineering.In this paper, the dynamic resilience modulus test of geogrid-reinforced gravel soil was carried out by dynamic triaxial apparatus, and the influence pattern of water content, reinforcement mode, the shear and lateral influence characterization in the dynamic resilience modulus were comparatively analyzed.The prediction model parameters for dynamic resilience modulus were analyzed by regression. Experimental results showed that the dynamic resilience modulus of reinforced soil reduced with increase of moisture content.The geogrid should be laid in the horizontal shear deformation layer in the soil, the dynamic resilience modulus could be considerably improved by increasing the number of reinforcement layers or reducing the spacing of layers.When other conditions remained unchanged, the dynamic resilience modulus increased with the increase of shear and lateral influence characterization. The parameter regression results of the NCHRP 1-28A model were satisfactory, the model could be used to predict the dynamic resilience modulus of geogrid-reinforced reinforced soil.