Slurry Deposition Method of Low-Plasticity Intermediate Soils for Laboratory Element Testing
Slurry Deposition Method of Low-Plasticity Intermediate Soils for Laboratory Element Testing
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用于实验室元素测试的低塑性中间土的泥浆沉积方法
DOI：
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发表时间：
2020
影响因子：
1.6
通讯作者：
R. Boulanger
中科院分区：
文献类型：
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作者：
C. P. Krage;A. B. Price;W. Lukas;J. DeJong;D. DeGroot;R. Boulanger
一种可重复的制备方法可用于研究一系列土壤类型（例如， 级配，塑性）和测试条件（例如， 应力水平、应力历史）。现有的实验室试样制备方法一般可分为无粘性土和粘性土两类，因此只适用于范围较窄的土壤和试验条件。这些常规制备技术对于具有中间（或过渡）性质和行为的土壤的适用性相对未知。在这项研究中，一系列的中间土壤，是不适合传统的砂或粘土的特性，准备使用泥浆沉积技术和oedemetric固结，不排水单调三轴剪切，不排水单调和不排水循环直接简单剪切由三名研究人员在两个不同的大学进行评估。结果表明，本文开发的泥浆技术可以产生均匀的混合物的非塑性，低塑性和高塑性的土壤，可重复的行为从奇异的混合物的所有测试方法。在此范围内的土壤试样响应的评估表现出系统的趋势，增加压缩性与塑性增加和从扩张到收缩的趋势与土壤塑性增加的过渡。总的来说，这些结果的合成混合物的硅质粉土和高岭土表明，泥浆沉积技术是适用于细粒，中间土壤的范围内的可塑性从非塑性到高塑性土壤。
A repeatable preparation method is useful for investigating systematic variations in behavior across a range of soil types (e.g., gradation, plasticity) and test conditions (e.g., stress level, stress history). Existing methods for preparation of laboratory specimens can be generally categorized into those for cohesionless and cohesive soils, thereby focusing on a narrow range of soils and test conditions. The applicability of these conventional preparation techniques for soils with intermediate (or transitional) properties and behaviors are relatively unknown. In this study, a range of intermediate soils that are not amenable to traditional sand-like or claylike characterization are prepared using a slurry deposition technique and evaluated in oedemetric consolidation, undrained monotonic triaxial shear, and both undrained monotonic and undrained cyclic direct simple shear by three researchers at two separate universities. Results indicate that the slurry technique developed herein can produce uniform mixtures of nonplastic, low-plasticity, and high-plasticity soils, with repeatable behaviors obtained from singular mixtures for all test methods. Evaluation of specimen response across this range of soils exhibits systematic trends of increasing compressibility with increasing plasticity and a transition from dilative to contractive tendencies with increasing soil plasticity. Collectively, these results for synthetic mixtures of silica silt and kaolin clay suggest that the slurry deposition technique is applicable to fine-grained, intermediate soils across a range of plasticity from nonplastic to high-plasticity soils.