Optimal Deformation Modes for Estimating Soil Properties
Optimal Deformation Modes for Estimating Soil Properties
复制标题
用于估计土壤特性的最佳变形模式
DOI：
10.1061/9780784482124.055
复制
发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Hambleton, James P.
中科院分区：
文献类型：
--
作者：
Nally, Anastasia;Shi, Zhenhao;Hambleton, James P.
准确估计土壤力学性质是大多数工程应用的关键步骤。现场和实验室测试基本上都依赖于材料的机械变形（致动），同时测量其位移和应力（反应）方面的响应。面对这种广泛采用的方案，关键问题仍然没有答案：1）什么是最佳类型和/或模式的驱动，可以最有效地提取土壤特性; 2）什么类型的测量是最有用的推断材料常数？作为这些问题的调查的第一步，逆模型的直接简单剪切（DSS）试验的构建，其中可测量的响应被用来反算土壤性质。两个不同的长宽比的样本被认为是研究的变形模式的影响。测量选择的影响（即，其中观察到位移和/或应力）是通过评估逆模型性能来探索的，该逆模型性能将DSS测试视为具有可变位移和应力场的边界值问题，而不是将常规解释视为元素测试。参数的敏感性和相关系数作为量化指标比较材料表征的基础上不同的纵横比和类型的测量，并解释逆分析的性能。
Accurate estimation of soil mechanical properties represents a crucial step for most engineering applications. Both in situ and laboratory testing fundamentally rest on mechanically deforming (actuating) the material and simultaneously measuring its response in terms of displacements and stresses (reactions). Facing this widely adopted scheme, key questions remain unanswered: 1) what is the optimal type and/or mode of actuation that can most effectively extract soil properties; 2) what types of measurements are most useful for inferring material constants? As a first step in the investigation of these questions, an inverse model for the direct simple shear (DSS) test is constructed, wherein measurable responses are used to back-calculate soil properties. Specimens with two different aspect ratios are considered to study the influence of the deformation mode. The effect of the choice of measurements (i.e., which displacements and/or stresses are observed) is explored by assessing inverse model performance considering the DSS test as a boundary value problem, with variable displacement and stress fields, versus the conventional interpretation as an elemental test. Parameter sensitivities and correlation coefficients are employed as quantifiable metrics to compare material characterization based on different aspect ratios and types of measurements, and to interpret the performance of inverse analysis.
简单剪切装置造成的不均匀性
DOI：
--
发表时间：
1984
期刊：
影响因子：
--
作者：
M. Budhu
通讯作者：
M. Budhu
简单剪切装置中砂子在低应力水平下的行为
DOI：
--
发表时间：
1971
期刊：
影响因子：
--
作者：
M. Stroud
通讯作者：
M. Stroud