Simulation of Lightweight Deflectometer Measurements Considering Nonlinear Behavior of Geomaterials
Simulation of Lightweight Deflectometer Measurements Considering Nonlinear Behavior of Geomaterials
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考虑土工材料非线性行为的轻质挠度计测量模拟
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
S. Nazarian
中科院分区：
文献类型：
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作者：
C. Tirado;Karla Y. Gamez;A. Fathi;M. Mazari;S. Nazarian
轻型弯沉仪（LWD）越来越多地用于基于模量的质量控制。关于LWD实施的实际问题之一是，用于估计LWD模量的方程是基于弹性半空间理论，并且没有考虑土壤和土壤-冲击板相互作用的非线性行为。有限元法可以用来研究岩土材料的非线性特性和土-板相互作用对实测挠度的影响。这项研究提供了一种手段，占这些参数的影响，测量的响应和影响的深度。建立了考虑岩土材料非线性特性的随钻碎石路面结构动力有限元模型。考虑了一系列具有广泛性能和厚度的单层和双层系统。传递函数的开发，以调整从一个简单的分层弹性静态模型得到的响应的表面变形和模量。这项研究提供了实际的关系，最大限度地减少了额外的努力，在实施耗时的动态有限元方法。在这项研究中提出的关系可以用来估计更具代表性的目标随钻测井模量值。
Lightweight deflectometers (LWDs) are being used more often for modulus-based quality control of earthwork. One of the practical concerns about implementation of LWDs is that the equation used to estimate the LWD modulus is based on elastic half-space theory and does not account for the nonlinear behavior of soil and soil–impact plate interaction. The finite element method can be used to study the effects of nonlinear behaviors of geomaterials and the soil–plate interaction on the measured deflections. This study provides a means for accounting for the impact of these parameters on the measured responses and the depths of influence. A dynamic finite element model that considers the nonlinear behavior of geomaterials was developed to simulate the LWD on a pavement structure. A comprehensive range of single-layer and two-layer systems with a wide range of properties and thicknesses was considered. Transfer functions were developed to adjust the surface deformations and moduli from the responses obtained from a simple layered elastic static model. The study provides practical relationships that minimize the additional effort in implementing time-consuming dynamic finite element methods. The relationships proposed in this study can be used to estimate more representative target LWD modulus values.