{'fraction_non_alphanumeric': 0.012716763005780347, 'fraction_numerical': 0.0023121387283236996, 'mean_word_length': 5.434944237918216, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
PREDICTING RESIDUAL FRICTIONAL ANGLE BY ATTERBERG LIMITS FOR RESERVOIR EMBANKMENT SOILS

Slope stability is one of the greatest issues of concern in geotechnical engineering. In slope stability analyses, the residual strength of slip zones is the most important parameter for evaluating slope stability and for understanding the reactivation mechanisms. However, it is time-consuming and costly to obtain the residual frictional angle through shear tests. This paper presents the results of a laboratory study designed to evaluate the correlations between the residual frictional angle and the Atterberg limits, which include the liquid limit, the plastic limit and the plasticity index, using eight kinds of reservoir embankment soil samples. The residual frictional angle was measured by the Bromhead ring shear apparatus using remolded samples. Based on the laboratory study, significant correlations between the residual frictional angle and the different indexes were proposed for the reservoir embankment soil, especially in terms of the particle size of the soil, which was less than 0.425 mm. Processing the data on the shear tests led to the discovery that the quantity of eight tests was sufficient for obtaining relevant accuracy in determining the residual frictional angle. Based on the results of the tests, the relationships between the residual frictional angle and all the indexes were found. Compared with the other indexes, the liquid limit had a better correlation with the residual frictional angle. Formulas were predicted in this study that can provide a convenient and highly accurate means for calculating the residual frictional angle value for application to worldwide geotechnical engineering projects.