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Post-cyclic loading settlement of saturated clean sand

机译：饱和清洁砂的循环后荷载沉降

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Saturated sand deposits may experience significant settlement or reconsolidation with the dissipation of excess pore pressure in the post-cyclic loading phase even if liquefaction has not occurred. This paper presents results from an extensive and systematic experimental study on the factors governing the post-cyclic loading settlement of saturated clean sand. Strain-controlled, undrained, triaxial tests were performed on reconstituted specimens of Ottawa (C-109) sand. Effects of excess pore pressure, induced shear strain, consolidation stress, number of loading cycles, and relative density on post-loading settlement were investigated. It was found that the settlement potential during the post-loading phase is strongly correlated to the excess pore pressure; the larger the excess pore pressure the greater the settlement. The potential to develop excess pore pressure, however, decreases considerably with increasing consolidation effective stress in the range between 100 kPa and 400 kPa. Additionally, the level of induced shear strain and the number of loading cycles were confirmed to be important factors in the development of excess pore pressure and post-loading settlement. The results revealed a unique relationship between initial liquefaction and post-loading settlement. Specimens that were loaded up to initial liquefaction were found to experience about the same volumetric strain in the post-loading phase, irrespective of the induced shear strain. (C) 2015 Elsevier Ltd. All rights reserved.
机译：即使在未发生液化的情况下，饱和的砂沉积物在循环后加载阶段也可能会经历显着的沉降或固结，同时会消耗多余的孔隙压力。本文介绍了有关饱和清洁砂的循环后荷载沉降控制因素的广泛而系统的实验研究的结果。在重构的渥太华（C-109）沙土标本上进行了应变控制，不排水的三轴试验。研究了过大孔隙压力，诱导剪切应变，固结应力，加载循环次数和相对密度对加载后沉降的影响。发现在后加载阶段的沉降潜力与过大的孔隙压力密切相关。多余的孔隙压力越大，沉降越大。但是，随着固结有效应力在100 kPa至400 kPa之间的增加，产生过大孔隙压力的可能性会大大降低。此外，确定的诱发剪切应变水平和加载循环数是产生过大孔隙压力和加载后沉降的重要因素。结果揭示了初始液化和装填后沉降之间的独特关系。发现加载到初始液化的样品在加载后阶段会经历大约相同的体积应变，而与诱导剪切应变无关。 （C）2015 Elsevier Ltd.保留所有权利。

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