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The influence of pore fluids on shear strength and stress-strain behavior of granular soils.

机译：孔隙流体对颗粒状土抗剪强度和应力应变特性的影响。

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摘要

When a dry granular soil is subjected to an external load, the stresses are transferred through mineral to mineral contacts. The shear strength of such a soil is governed by its contact properties. Presence of a thin layer of fluid between mineral to mineral contacts in a saturated soil will alter its contact properties. Therefore any change in the physical properties of pore fluid can logically be reasoned to influence the deformation characteristics of granular soils.; To investigate the influence of pore fluid viscosity on shear strength and stress-strain behavior of a soil, a series of consolidated drained triaxial tests were performed on a silty sand. The samples were prepared with four different pore fluids of varying viscosities and tested subjected to different consolidation pressures. Tests were performed with the aid of an automated triaxial testing apparatus.; Since the stress-strain behavior of this silty sand can not be normalized, the variation of residual shear strength with critical void ratio was used for the analysis of results. When residual shear strength values were plotted against its critical void ratios, a family of curves that could be identified by their pore fluid viscosities were obtained. For a given critical void ratio, as pore fluid viscosity increased the residual shear strength was found to decrease.; To provide a mechanistic explanation to the changes in the strength characteristics due to pore fluid viscosity, a microscopic model was used to study the changes in the contact properties at particle level. The microscopic numerical model TRUBAL, based on the DEM was used in this research to simulate the mechanical behavior of a granular soil subjected to a triaxial stress condition. Since this numerical model was developed to simulate the behavior of a dry granular assembly of spheres, it was modified to incorporate the effects of pore fluid viscosity by using Reynolds equation for hydrodynamic lubrication. The modified TRUBAL program was used to simulate deformation characteristics of saturated granular soils.; The modified program was then used in a qualitative study to simulate stress-strain behavior of a granular assembly having different pore-fluid viscosities, subjected to consolidated drained triaxial test conditions. Numerical simulations showed a similar trend as observed in the physical tests.
机译：当干燥的粒状土壤受到外部负载时，应力会通过矿物传递到矿物接触点。这种土壤的剪切强度取决于其接触特性。在饱和土壤中的矿物与矿物之间的接触之间存在薄薄的流体层将改变其接触特性。因此，从逻辑上讲，孔隙流体物理性质的任何变化都可以影响粒状土壤的变形特性。为了研究孔隙流体粘度对土壤的剪切强度和应力-应变行为的影响，在粉砂上进行了一系列固结排水三轴试验。用四种不同粘度的不同孔隙流体制备样品，并在不同的固结压力下进行测试。借助于自动三轴测试设备进行测试。由于这种粉砂的应力应变特性无法归一化，因此将残余剪切强度随临界空隙率的变化用于结果分析。当将残余抗剪强度值相对于其临界孔隙率作图时，可以得到一系列可以通过其孔隙流体粘度确定的曲线。对于给定的临界空隙率，发现随着孔隙流体粘度的增加，残余剪切强度降低。为了对由于孔隙流体粘度引起的强度特性的变化提供机械解释，使用了微观模型研究了颗粒级接触特性的变化。基于DEM的微观数值模型TRUBAL被用于模拟三轴应力条件下粒状土的力学行为。由于开发了此数值模型来模拟球的干燥颗粒装配体的行为，因此使用Reynolds方程对流体动力润滑进行了修改，以合并孔隙流体粘度的影响。改进的TRUBAL程序用于模拟饱和粒状土的变形特性。修改后的程序随后用于定性研究，以模拟具有不同孔隙流体粘度的粒状组件在固结排水三轴测试条件下的应力应变行为。数值模拟显示出与物理测试相似的趋势。

著录项

  • 作者

    Ratnaweera, Prasanna.;

  • 作者单位

    New Jersey Institute of Technology.;

  • 授予单位 New Jersey Institute of Technology.;
  • 学科 Engineering Civil.; Geotechnology.
  • 学位 Ph.D.
  • 年度 1992
  • 页码 183 p.
  • 总页数 183
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;地质学;
  • 关键词

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