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Assessing depth of influence of intelligent compaction rollers by integrating laboratory testing and field measurements
Transportation Geotechnics ( IF 5.3 ) Pub Date : 2020-12-31 , DOI: 10.1016/j.trgeo.2020.100509
Aria Fathi , Cesar Tirado , Sergio Rocha , Mehran Mazari , Soheil Nazarian

One concern usually expressed about the implementation of Intelligent Compaction (IC), especially in tandem with modulus-based spot tests, is the uncertainty in the depth of influence of different devices. The depth of influence is mainly contingent upon the weight, dimensions, and operating settings of the employed roller as well as the characteristics of the underlying materials. This study attempts to evaluate the depth of influence of IC rollers using simulated and field data. A three-dimensional (3D) finite element (FE) model was developed to simulate proof-mapping of the roller on compacted geomaterials. That FE model was used to carry out an extensive parametric study that considered the nonlinear behavior of the geomaterials and the roller operating conditions including static and vibratory movements at stationary and moving conditions for single- (subgrade only) and two-layered (subgrade and base) geosystems. Different test sites were instrumented using in-ground sensors to conduct vibratory IC tests with several instrumented IC rollers for further assessment and verification of the depth of influence. The estimated field, as well as numerical results, indicate a dependency between the depth of influence and the type of geomaterial. The depth of influence increases when geomaterial becomes more granular and decreases with an increase in the cohesion of the geomaterial.



中文翻译:

通过集成实验室测试和现场测量来评估智能压实辊的影响深度

人们通常对智能压实(IC)的实现表示关注,尤其是与基于模量的现场测试相结合时,是不同设备影响深度的不确定性。影响的深度主要取决于所用辊的重量,尺寸和操作设置以及底层材料的特性。这项研究试图使用模拟和现场数据评估IC辊的影响深度。建立了三维(3D)有限元(FE)模型,以模拟压实土工材料上压路机的校对图。该有限元模型用于进行广泛的参数研究,该研究考虑了土工材料的非线性行为以及压路机的工作条件,包括在单层(仅限路基)和两层(路基和基础)的静止和运动条件下的静态和振动运动。 )的地球系统。使用地面传感器对不同的测试地点进行了仪器测试,并使用几个已安装的IC滚轮进行振动IC测试,以进一步评估和验证影响深度。估计的字段以及数值结果表明影响深度与土工材料类型之间的相关性。当土工材料变得更粒状时,影响深度会增加,并随着土工材料的内聚力的增加而减小。使用地面传感器对不同的测试地点进行了仪器测试,并使用几个已安装的IC滚轮进行振动IC测试,以进一步评估和验证影响深度。估计的字段以及数值结果表明影响深度与土工材料类型之间的相关性。当土工材料变得更粒状时,影响深度会增加,并随着土工材料的内聚力的增加而减小。使用地面传感器对不同的测试地点进行了仪器测试,并使用几个已安装的IC滚轮进行振动IC测试,以进一步评估和验证影响深度。估计的字段以及数值结果表明影响深度与土工材料类型之间的相关性。当土工材料变得更粒状时,影响深度会增加,并随着土工材料的内聚力的增加而减小。

更新日期:2021-01-22
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