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A numerical investigation of the effects of loading conditions on soil response.

机译：加载条件对土壤响应影响的数值研究。

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摘要

All three principal stresses play a part in the stress-strain-strength response and volumetric behavior of granular soils. In geotechnical engineering, conventional triaxial compression (CTC), plane strain (PS), and direct shear (DS) are the three most commonly used laboratory tests to simulate the field conditions. It is natural to assume that specimens subjected to different loading conditions will show different responses and behaviors. In reality, many soil problems involving shear strength approximate to PS loading conditions in the field (e.g., earth dam and retaining wall). However, CTC or DS test is typically used to measure the stress-strain-strength parameters for design because of their simplicity and versatility compared with the complexity and difficulty of the PS test. The current research focuses on the numerical analysis of effects of different loading conditions (e.g., CTC, PS, and DS) on the macro- and micro-behaviors of granular materials using discrete element method (DEM). The microscale particle behaviors are used to explain the macroscale stress-strain-strength-volume responses of the assembly. Analytical, statistical, and stereological approaches are employed.;Models of the CTC, PS, and DS tests are developed. A new method to simulate the membrane behavior is proposed. Parametric analyses to qualitatively assess the effects of the specific parameter on macroscale response of the specimen are performed. Macroscale responses of sets of simulations of assemblies under PS, CTC, and DS loading conditions are studied. Small-strain response, shear strength, and volumetric behavior of the assembly under different loading conditions are investigated. Microscale analyses on the assembly behaviors (e.g., void ratio and coordination number) and particle behaviors (e.g., particle rotation and displacement) are conducted. Particle orientation and contact properties (e.g., contact normal and contact force) are investigated using statistical analysis method. An algorithm to generate numerical slicing images which is to simulate the way in laboratory experiments is proposed. The local void ratio distribution analyses and particle orientation distribution analysis are performed stereological method. Integrating macro-, micro-, and stereological methods, some issues such as strain localization, critical state, and principal stress direction rotation of DS test are investigated.
机译：这三个主应力都在粒状土壤的应力-应变-强度响应和体积行为中起作用。在岩土工程中，常规三轴压缩（CTC），平面应变（PS）和直接剪切（DS）是模拟现场条件的三种最常用的实验室测试。很自然地假设，承受不同载荷条件的试样将显示出不同的响应和行为。实际上，许多涉及剪切强度的土壤问题都接近于野外的PS加载条件（例如，土坝和挡土墙）。但是，与PS测试的复杂性和难度相比，由于CTC或DS测试具有简单性和多功能性，因此通常用于测量设计的应力-应变-强度参数。当前的研究重点是使用离散元方法（DEM）对不同载荷条件（例如CTC，PS和DS）对颗粒材料的宏观和微观行为的影响进行数值分析。微观尺度的粒子行为被用来解释组件的宏观尺度应力-应变-强度-体积响应。采用分析，统计和立体方法。开发了CTC，PS和DS测试模型。提出了一种模拟膜行为的新方法。进行参数分析以定性评估特定参数对样品宏观响应的影响。研究了PS，CTC和DS加载条件下的装配模拟集的宏观响应。研究了在不同载荷条件下组件的小应变响应，剪切强度和体积行为。对组装行为（例如，空隙率和配位数）和颗粒行为（例如，颗粒旋转和位移）进行微观分析。使用统计分析方法研究颗粒的取向和接触特性（例如接触法向和接触力）。提出了一种数值切片图像的生成算法，以模拟实验室实验的方式。局部孔隙率分布分析和颗粒取向分布分析采用立体方法。结合宏观，微观和立体学方法，研究了DS试验的应变局部化，临界状态和主应力方向旋转等问题。

著录项

  • 作者

    Zhao, Xueliang.;

  • 作者单位

    North Carolina State University.;

  • 授予单位 North Carolina State University.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 511 p.
  • 总页数 511
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

  • 入库时间 2022-08-17 11:38:30

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