土工格栅加筋碎石土动回弹模量试验及预估模型研究
DOI:
作者:
作者单位:

1.中交路桥建设有限公司;2.长沙理工大学

作者简介:

通讯作者:

中图分类号:

U416.1

基金项目:

江西省交通科技计划项目


Experiments on Dynamic Resilience Modulus and Prediction Model of Geogrid Reinforced Gravel Soil
Author:
Affiliation:

1.Road &2.Bridge International Co. Ltd.;3.Changsha University of Science and Technology

Fund Project:

Jiangxi Transportation Science and Technology Project

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    摘要:

    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。本文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,增加加筋层数或减少层间距,对提高动回弹模量的效果明显;在其他条件不变时,动回弹模量随剪切和侧限影响表征量的增大而增大;NCHRP 1-28A模型参数的回归结果比较理想,该模型可用于对土工格栅加筋土动回弹模量的预测。上述试验及分析成果可为路面结构设计时确定加筋土路基动回弹模量提供依据,促进加筋土技术在道路工程中的推广应用。

    Abstract:

    The dynamic resilience modulus of reinforced subgrade is an important design index of reinforced soil technology in road engineering. In this paper, the dynamic resilience modulus test of geogrid-reinforced reinforced gravel soil was carried out by dynamic triaxial apparatus, the influence law of water content, reinforcement mode, the shear and lateral influence characterization in the dynamic resilience modulus were comparatively analyzed, the dynamic resilience modulus prediction model parameters were analyzed by regression. Experimental results showed that the dynamic resilience modulus of reinforced soil reduced with the increase of moisture content. The geogrid should be laid in the horizontal shear deformation layer in the soil, the dynamic resilience modulus could be obvious 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. The above test and analysis results can provide the pavement structure design basis of dynamic resilience modulus of reinforced soil subgrade, promote the application of reinforced soil technology in road engineering.

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历史
  • 收稿日期:2020-07-13
  • 最后修改日期:2020-11-24
  • 录用日期:2020-11-25
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