Abstract In order to more accurately and thoroughly classify the moraine, similar materials for moraine were pre? pared based on similarity theory, and direct shear tests were designed to study the influence of gravel content on the mechanical properties of moraine. Next, gravel content was introduced, and based on entropy-weight-extended matter-element theory, a classification model for moraine was established, refining the traditional Ⅳ and Ⅴ-grade moraine into five grades, MⅠ to MⅤ. Finally, nine sections were selected, and the results calculated using the entropyweight-extended matter-element method were compared with the classfication results from the "Railway Tunnel Design Code" and the BQ method. The study shows that gravel content is an important factor affecting the mechanical properties of moraine. The results of the classification model incorporating gravel content based on entropy-weightextended matter-element theory not only correctly determine the surrounding rock grade but also refine the traditional Ⅳ and Ⅴ-grade surrounding rock into five grades, MⅠ to MⅤ. This is more conducive to the selection of tunnel support structures and parameters for moraine surrounding rock, and the method provides a new approach for the classification of similar special tunnel surrounding rocks.
Abstract：
In order to more accurately and thoroughly classify the moraine, similar materials for moraine were pre? pared based on similarity theory, and direct shear tests were designed to study the influence of gravel content on the mechanical properties of moraine. Next, gravel content was introduced, and based on entropy-weight-extended matter-element theory, a classification model for moraine was established, refining the traditional Ⅳ and Ⅴ-grade moraine into five grades, MⅠ to MⅤ. Finally, nine sections were selected, and the results calculated using the entropyweight-extended matter-element method were compared with the classfication results from the "Railway Tunnel Design Code" and the BQ method. The study shows that gravel content is an important factor affecting the mechanical properties of moraine. The results of the classification model incorporating gravel content based on entropy-weightextended matter-element theory not only correctly determine the surrounding rock grade but also refine the traditional Ⅳ and Ⅴ-grade surrounding rock into five grades, MⅠ to MⅤ. This is more conducive to the selection of tunnel support structures and parameters for moraine surrounding rock, and the method provides a new approach for the classification of similar special tunnel surrounding rocks.
CHEN Zhimin LIU Baoli XU Jiangtao
.Study on Shear Characteristics and Classifications of Moraine Considering Gravel Content[J] MODERN TUNNELLING TECHNOLOGY, 2025,V62(1): 38-47
2025, Vol. 62 