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<p>The Xiyu conglomerate is widely distributed across the foreland basins of the northern and southern foothills of the Tianshan Mountains. As a soil-rock transitional material with unique geological properties, its engineering characteristics are governed by both particle grading and the degree of cementation. This study systematically investigates the relationship between structural characteristics and shear strength through macro-, micro- and mesoscale testing. The findings indicate that the conglomerate exhibits dual fractal properties, with self-similar structures forming in both the coarse- and fine-grained regions. The critical threshold is 1.0&#xa0;mm. Microscopic analysis reveals that undisturbed specimens have a highly integrated structure that is primarily held together by cementation bonds. In contrast, remodelled specimens exhibit only weak contact cementation due to disruption of the cementation system, resulting in cohesion values of merely 59.5% relative to undisturbed specimens. This confirms the dominant influence of structural integrity on mechanical properties. Direct shear tests show that the content of coarse grains governs shear swelling behaviour, with fractal dimension and particle content jointly regulating strength parameters. An optimal gradation exists where cohesion and the internal friction angle peak simultaneously.Accordingly, this study systematically elucidates the synergistic control mechanism of “gradation-fractal-cohesion” and demonstrates its validity. It shows that gradation fractals mainly control skeletal load-bearing capacity and shear swelling characteristics, while cementation mainly controls structural integrity and cohesive strength. The interaction between these two factors determines the optimal strength range, providing a theoretical framework for predicting the performance of similar geomaterials and optimising engineering applications.</p>

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Study on the mechanism by which the textural characteristics of mud cemented Xiyu conglomerate influence shear strength

  • 期刊论文

  • 发表日期：

    2026年3月25日

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  • Pingan Tang,
  • Jianxin He,
  • Liang Liu,
  • Yanwen Wang,
  • Bin Wang

摘要

The Xiyu conglomerate is widely distributed across the foreland basins of the northern and southern foothills of the Tianshan Mountains. As a soil-rock transitional material with unique geological properties, its engineering characteristics are governed by both particle grading and the degree of cementation. This study systematically investigates the relationship between structural characteristics and shear strength through macro-, micro- and mesoscale testing. The findings indicate that the conglomerate exhibits dual fractal properties, with self-similar structures forming in both the coarse- and fine-grained regions. The critical threshold is 1.0 mm. Microscopic analysis reveals that undisturbed specimens have a highly integrated structure that is primarily held together by cementation bonds. In contrast, remodelled specimens exhibit only weak contact cementation due to disruption of the cementation system, resulting in cohesion values of merely 59.5% relative to undisturbed specimens. This confirms the dominant influence of structural integrity on mechanical properties. Direct shear tests show that the content of coarse grains governs shear swelling behaviour, with fractal dimension and particle content jointly regulating strength parameters. An optimal gradation exists where cohesion and the internal friction angle peak simultaneously.Accordingly, this study systematically elucidates the synergistic control mechanism of “gradation-fractal-cohesion” and demonstrates its validity. It shows that gradation fractals mainly control skeletal load-bearing capacity and shear swelling characteristics, while cementation mainly controls structural integrity and cohesive strength. The interaction between these two factors determines the optimal strength range, providing a theoretical framework for predicting the performance of similar geomaterials and optimising engineering applications.