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Effective Stress Failure Envelope Forms and Parameter Variability

机译:有效应力故障包络形式和参数变异性

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Triaxial tests are often used to determine the effective stress strength envelope of soils. Although the linear Mohr-Coulomb envelope is often used in geotechnical engineering, the failure envelope can also be non-linear, with or without a shear stress intercept (i.e., cohesion). Selection of an appropriate mathematical form for the strength envelope is an important step in the interpretation of test data and characterization of soil properties. Thirty-three triaxial data sets were analyzed using a spreadsheet that determines best-fit envelopes for linear, two and three parameter power functions, secant Φ', and modified Hoek Brown mathematical forms along with the coefficient of variation of the shear strength data. The trends in the type of envelope and variability are discussed. Variability in test data leads to uncertainty in the characterization of shear strength. Possible sources of such variability are the composition of the soil itself and error introduced during testing. The impact of the number of tests and variability on the linear model parameters is assessed for remolded clay and compacted clay. An increase in the number of tests reduces the uncertainty of linear model parameter values but has little effect on the predicted shear strength at a representative normal stress of one atmosphere.
机译:三轴试验通常用于确定土壤的有效应力强度包络。尽管线性Mohr-Coulomb封套通常用于岩土工程,但故障包络也可以是非线性的,有或没有剪切应力截距(即凝聚力)。为强度包络的选择适当的数学形式是解释测试数据和土壤性质表征的重要步骤。使用电子表格进行分析三十三个三轴数据集,该电子表格确定用于线性,两个和三个参数功率功能,Secantφ'和修改的Hoek棕色数学形式以及剪切强度数据的变化系数。讨论了信封类型和变异性的趋势。测试数据的变异性导致剪切强度表征的不确定性。这种可变性的可能源是土壤本身的组成和测试期间引入的误差。评估检翻乳粘土和压实粘土的线性模型参数对测试数量和可变性的影响。测试数量的增加降低了线性模型参数值的不确定性,但对一个大气的代表性正常应力下的预测剪切强度几乎没有影响。

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