| 含充填节理软硬互层岩体的动态力学性质和破坏特征分析 |
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| 关键词:rock dynamics filled joint thickness soft-hard rock layer thickness ratio DIC failure mode |
| 基金项目:本文由国家自然科学基金项目(编号: 51878005)资助。 |
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| 摘要: |
| Study on the Dynamic Mechanical Properties and Failure Mechanism of Hard-soft Interbedded Rock Mass with Filled Joints |
| To ensure the safe construction and stable maintenance of tunnel projects in western mountainous regions, this study investigates the mechanical properties and failure modes of soft-hard interbedded rock structures containing filled joints, which are widely distributed in such rock masses. The Split Hopkinson Pressure Bar (SHPB) system combined with Digital Image Correlation (DIC) technology was employed to analyze the effects of filled joint thickness and the soft-hard rock thickness ratio on the dynamic mechanical properties and failure characteristics of the rock mass. The results indicate that as the soft-hard rock thickness ratio and filled joint thickness increase, the dynamic compressive strength of the rock mass decreases, while the peak strain shows an increasing trend. With an increasing soft-hard rock thickness ratio, the absorbed energy density initially increases and then decreases; conversely, the filled joint thickness is negatively correlated with the absorbed energy density. When the soft-hard rock thickness ratio is 1:1, the filled joint thickness controls the failure sequence: as the thickness increases, the failure sequence evolves from the initial failure of the soft rock layer (0 mm) to the simultaneous cracking of the soft-hard rock layers and the filled joint (2.5 mm and 5 mm), and finally to the prior failure of the filled joint (10 mm). The failure mode is jointly influenced by the filled joint thickness and the soft-hard rock thickness ratio. At a ratio of 1:1, specimens with joint thicknesses of 0–5 mm undergo tensile failure, while those with a thickness of 10 mm primarily exhibit compression of the filled joint accompanied by bulging. For specimens with ratios of 2:1, 3:1, and 4:1, the failure mode is a tensile-shear composite failure. Furthermore, with the increase in filled joint thickness, the failure mode of the filled joint transitions from compression to tension; whereas an increase in the proportion of soft rock significantly inhibits the lateral tensile deformation of the filled joint. |
| WANG Zhensen,RONG Chuanxin,SHI Xin,SU Qingqing,AN Gangjian.2026.Study on the Dynamic Mechanical Properties and Failure Mechanism of Hard-soft Interbedded Rock Mass with Filled Joints[J].Acta Geoscientica Sinica,47(4):911-925. |
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