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首页> 外文会议>Geotechnical Special Publication no.143; Japan-U.S. Workshop on Testing, Modeling, and Simulation; 20030627-29; Boston,MA(US) >A Soil Structure Index to Predict Rate Dependence of Stress-Strain Behavior
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A Soil Structure Index to Predict Rate Dependence of Stress-Strain Behavior

机译：土壤结构指数预测应力-应变行为的速率依赖性

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摘要

Soil structure depends on a number of influences, including geomorphology, groundwater fluctuations and geochemistry. In the case of soft clays, this structure is believed to play a significant role in the degree of rate dependence of the clay's stress-strain behavior. However, there has been no systematic method developed to predict what degree of structure will produce a particular degree of stress-strain rate dependence. This paper presents a methodology based on Burland's (1990) void index (I_v) framework to predict the type of rate dependence that could be expected for a soil's stress-strain behavior in one-dimensional (1-D) compression. Three categories of rate dependence in 1-D compression have been reported in the literature, characterized by the following: 1) rate dependence in both the preconsolidation stress (σ'p) and virgin compression; 2) σ'p is not rate dependent, but the slope of the virgin compression line varies with strain rate; and 3) little or no rate dependence in any portion of the compression curve. Based on a series of 1-D tests on soils from Canada and the U.S., rate-dependent behavior types were compared to each soil's natural state in Burland's I-v versus vertical effective stress space. A so-called "structure number" (SN) is introduced, indicating how far the soil's natural state is from its intrinsic or remolded compression curve (ICL; SN = 0) and its original sedimentation compression curve (SCL; SN = 1). The contour with SN=2 is parallel to these two, approximately parallel lines, but above the SCL at a distance equal to the SCL-ICL gap. Higher SN value contours are similarly obtained. The results indicate that SN correlates well to the type of rate dependence observed in the 1-D compression tests. These initial results appear to provide a rational link between soil structure and strain rate dependence.
机译：土壤结构取决于多种影响，包括地貌，地下水波动和地球化学。在软粘土的情况下，据信这种结构在粘土的应力-应变行为的速率依赖性程度中起重要作用。但是，还没有开发出系统的方法来预测哪种结构程度将产生特定程度的应力-应变率依赖性。本文提出了一种基于Burland（1990）空隙指数（I_v）框架的方法，该方法可预测速率依赖性的类型，这种速率依赖性可预期在一维（1-D）压缩中土壤的应力应变行为。一维压缩中的三类速率依赖性已被报道，其特征如下：1）预固结应力（σ'p）和原始压缩中的速率依赖性； 2）σ'p与速率无关，但原始压缩线的斜率随应变率而变化； 3）在压缩曲线的任何部分几乎没有速率依赖性。根据对加拿大和美国土壤进行的一系列一维测试，将速率相关的行为类型与Burland I-v相对于垂直有效应力空间中每种土壤的自然状态进行了比较。引入了一个所谓的“结构编号”（SN），表示土壤的自然状态与其固有或重塑的压缩曲线（ICL; SN = 0）和其原始沉降压缩曲线（SCL; SN = 1）有多远。 SN = 2的轮廓与这两条近似平行的线平行，但在SCL上方的距离等于SCL-ICL间隙。类似地获得较高的SN值轮廓。结果表明，SN与一维压缩测试中观察到的速率依赖性类型密切相关。这些初步结果似乎提供了土壤结构与应变率依赖性之间的合理联系。

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