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| Study on the influence of clay content and dry density on the triaxial mechanical properties of filling medium |
| WANG Meixia1, MA Xiankai2, ZHANG Zhiyuan2, MA Shijie2, WANG Senwei2
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1. Institute of Geotechnical and Underground Engineering, Shandong University, Jinan 250061, Shandong, China;
2. School of Qilu Transportation, Shandong University, Jinan 250002, Shandong, China |
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Abstract To scientifically reveal the influence of clay content and dry density on the shear strength characteristics of filling medium, triaxial shear tests were performed for filling media with different clay contents and dry densities. The results indicated that the softening degree of the stress-strain curve of the filling medium was found to first decrease and then increase with the increase in clay content; with the increase in clay particles, the role of clay particles was transformed in stages as "filling, lubrication, and force-bearing", and the main force-bearing component was gradually transitioned from sand particles to clay particles. The cohesion of the filling medium was positively correlated with both clay content and dry density; furthermore, the greater the cohesion, the stronger the cementation between particles, and the less likely water inrush disasters were to occur. The internal friction angle of the filling medium was observed to increase with the increase in dry density, while it first decreased and then increased with the increase in clay content. A quantitative characterization model linking cohesion, internal friction angle, clay content, and dry density was established, and the research findings were found to have certain theoretical reference value for the prevention and control of water and mud inrush disasters in tunnel fault fracture zones.
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Published: 29 December 2025
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