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首页> 外文期刊>International journal of geomechanics >Experimental Study on the Effects of Initial Conditions on Liquefaction of Saturated and Unsaturated Sand
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Experimental Study on the Effects of Initial Conditions on Liquefaction of Saturated and Unsaturated Sand

机译：初始条件对饱和和不饱和砂土液化影响的实验研究

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Soil liquefaction is one of the most common geohazards that is often the root cause of damage and disruption to the civil infrastructure systems. It has been tacitly considered to only occur in loose saturated sand or low-plasticity silts. A series of strain-controlled cyclic loading tests on saturated and unsaturated Nevada sand has been conducted to reveal the fact that not only saturated soils, but also unsaturated soils, can be liquefied when certain test conditions are satisfied. In this laboratory study, different initial conditions of soil specimens are tested. These conditions include the following: relative density (30 and 70%), effective confining stress (50 and 200 kPa), and degree of saturation (90, 95, and 100%). All specimens, except the one with 70% relative density, 200 kPa confining stress, and 90% degree of saturation, reach liquefaction at the end of the tests. Although it is well established that liquefaction resistance increases with relative density and confining stress and decreases with the degree of saturation, some quantitative guidance to evaluate liquefaction of soils, especially under their unsaturated states is provided from this study. These guidelines can serve as the basis to transform current geotechnical design procedure when unsaturated soils are involved. (C) 2014 American Society of Civil Engineers.
机译：土壤液化是最常见的地质灾害之一，通常是破坏和破坏民用基础设施系统的根本原因。它被默认认为仅发生在疏松的饱和砂土或低塑性淤泥中。已经对内华达州的饱和砂和不饱和砂进行了一系列的应变控制循环载荷试验，结果表明，只要满足一定的试验条件，不仅饱和土而且可以使非饱和土液化。在此实验室研究中，测试了土壤样本的不同初始条件。这些条件包括：相对密度（30％和70％），有效约束应力（50和200 kPa）以及饱和度（90％，95％和100％）。除具有70％相对密度，200 kPa围压和90％饱和度的试样外，所有试样均在试验结束时达到液化状态。虽然已经公认，抗液化性随相对密度和围压而增加，而随饱和度而降低，但这项研究提供了一些定量的方法来评估土壤的液化，特别是在其非饱和状态下。当涉及非饱和土壤时，这些准则可以作为改变当前岩土设计程序的基础。 （C）2014年美国土木工程师学会。

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