Abstract The European Standard EN ISO 17892-12:2018 describes the means of determining the liquid limit (LL) of soils using two independent test methods: the Casagrande percussion cup and fall cone test. The first method is characterized mainly by its universality and the second by its simplicity. However, these two methods are known to provide different results. The higher the LL, the greater is the difference between the results. In 2019, Shimobe and Spagnoli established a correlation between the Casagrande and fall cone tests for soils with LL 150%. Mohajerani method, which combines the universality of the former method and the simplicity of the latter, is applicable for such soils. The main objective of the study was to apply the Mohajerani method to determine the LLs based on fall cone test results and to compare them with those of the Casagrande test (soft base), with focus on soils with LL > 150%. The experimental results showed that for high plasticity soil (containing bentonite, etc.), the differences in the LL between the Casagrande and fall cone tests are significant (ab to relative ratio 30%), and some modification of the fall cone test evaluation is required. This study confirmed excellent agreement between the LL evaluated using the Mohajerani method (i.e., modification of the fall cone test evaluation) and that obtained from the Casagrande test, even for soils with higher LLs. Furthermore, the fall cone test results were used to determine the plastic limit (PL) for those soils with LLs within 20–50% for which the Casagrande LL and standard fall cone LL were correlated (where the latter was not modified by the Mohajerani method). Determination of the PL for these types of soils via the fall cone test results offers credible results comparable to those of the standard thread rolling test.

中文翻译：

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Mohajerani 方法：使用与 Casagrande 测试具有强相关性的落锥测试结果来确定土壤液限的工具

摘要 欧洲标准 EN ISO 17892-12:2018 描述了使用两种独立测试方法确定土壤液限 (LL) 的方法：Casagrande 冲击杯和落锥测试。第一种方法的特点主要是它的普遍性，第二种方法的特点是简单。然而，已知这两种方法提供不同的结果。LL 越高，结果之间的差异就越大。2019 年，Shimobe 和 Spagnoli 建立了 LL 150% 土壤的 Casagrande 和落锥试验之间的相关性。Mohajerani 方法结合了前一种方法的普遍性和后一种方法的简单性，适用于此类土壤。该研究的主要目的是应用 Mohajerani 方法根据落锥测试结果确定 LL，并将其与 Casagrande 测试（软基）的结果进行比较，重点是 LL > 150% 的土壤。实验结果表明，对于高塑性土（含膨润土等），Casagrande 和落锥试验的 LL 差异显着（ab 相对比为 30%），对落锥试验评价的一些修改是必需的。这项研究证实了使用 Mohajerani 方法评估的 LL 与从 Casagrande 测试获得的 LL 之间的极好一致性，即使对于具有较高 LL 的土壤也是如此。此外，落锥试验结果用于确定 LL 为 20-50% 的那些土壤的塑性极限 (PL)，其中 Casagrande LL 和标准落锥 LL 相关（后者未通过 Mohajerani 方法修改）。通过落锥试验结果确定这些类型土壤的 PL 提供了与标准螺纹滚压试验相当的可靠结果。