Parameter variability of undrained shear strength and strain using a database of reconstituted soil tests
Parameter variability of undrained shear strength and strain using a database of reconstituted soil tests
复制标题
使用重构土测试数据库的不排水剪切强度和应变的参数变化
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
P. J. Vardanega
中科院分区：
文献类型：
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作者：
Mair E. W. Beesley;P. J. Vardanega
在施工过程中，必须限制不排水抗剪强度的发挥，以避免土壤破坏。必须控制土壤应变，以避免影响结构的使用性能。为了通过强度动员来评估地基性能，需要了解不同强度动员水平下的土壤应变。在实践中，地面调查数据往往是有限的，和评估的预期变化的应力-应变和不排水抗剪强度与经验的相关性与数据库校准，以改善。新数据库RFG/TXCU-278包含了278个重塑细粒土三轴固结不排水试验的数据。本文对数据库进行了分析，以评估不排水强度比（cu/[公式：见正文]）和参考剪切应变与剪切模式的变异性。新的数据库提供的证据表明，剪切应变（如不排水剪切强度）是敏感的固结（各向同性或K 0）和剪切模式（三轴压缩或扩展）中应用的测试。对于数据库中包含的材料，从三轴压缩试验中获得的强度动员参数可用于预测相应的三轴拉伸参数，以达到合理的精度。
During construction, the mobilization of undrained shear strength must be limited to avoid soil failure. Soil strains must be controlled to avoid compromising structural serviceability. To assess foundation performance by strength mobilization, an understanding of soil strains at various levels of strength mobilization is required. In practice, ground investigation data are often limited, and assessment of the expected variation of stress–strain and undrained shear strength is improved with empirical correlations calibrated with a database. The new database RFG/TXCU-278 contains data of 278 consolidated–undrained triaxial tests on reconstituted fine-grained soil samples compiled from the literature. Analysis of the database to evaluate the variability of undrained strength ratio (cu/[Formula: see text]) and a reference shear strain with shear mode is undertaken in this paper. The new database provides evidence that shear strain (like undrained shear strength) is sensitive to the consolidation (isotropic or K0) and shear mode (triaxial compression or extension) applied in the test. For the materials included in the database, the strength mobilization parameters obtained from a triaxial compression test can be used to predict the corresponding triaxial extension parameters to a reasonable accuracy.