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| Interaction mechanisms of landslide body-dangerous rock mass based on discontinuous deformation analysis |
| LIU Guoyang1, 2, LUO Shouyi1, YE Tangjin3, LIU Defang4, LI Yexin1, LIU Junjie1 |
(1. School of Architecture and Civil Engineering, Shenyang University of Technology, Shenyang, Liaoning 110870, China; 2. Plateau Major Infrastructure Smart Construction and Resilience Safety Technology Innovation Center, Lhasa, Xizang 850000, China;
3. Department of Railway Engineering, Sichuan College of Architectural Technology, Chengdu, Sichuan 610399, China;
4. PowerChina Huadong Engineering Corporation Limited, Hangzhou, Zhejiang 311100, China) |
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Abstract Landslides are among the most prevalent geological hazards along transportation routes. During deformation, failure, and movement, they may interact with large, hazardous rock masses, significantly altering the extent and severity of the hazard. This study focuses on the Luoma slope at mileage marker K4529＋600 of the G318 National Highway in the Xizang Autonomous Region as its engineering context. Employing the Discontinuous Deformation Analysis (DDA) method, this research investigates the interaction mechanisms between landslide bodies and hazardous rock masses, along with the kinematic processes and disaster characteristics involved. Basic models of oblique and face-to-face collisions were constructed and compared with results from existing experiments, numerical simulations, and theoretical formulas to validate the accuracy of the DDA method in simulating block collisions. Considering both the intact and undamaged state of the hazardous rock mass and its unstable condition after being intersected by joints, corresponding DDA numerical models of the Luoma slope were established. By analyzing the displacement-time curves of monitoring points on the landslide body, the reliability of the DDA method in simulating landslide deformation was confirmed. Building upon this, the effects of a reduced internal friction angle of the rock mass were examined, along with the obstructive role of hazardous rock masses on the landslide body, and the impact and destructive effects of the landslide body on the hazardous rock masses were separately investigated. This allowed for a comprehensive analysis of the landslide deformation and failure processes, as well as the kinematic disaster processes resulting from the interaction between the landslide body and the hazardous rock masses. The results demonstrate that the DDA method exhibits high accuracy in simulating block collisions and landslide deformations, making it particularly suitable for analyzing interactions between landslide bodies and hazardous rock masses. Landslide deformation is primarily characterized by surface subsidence, and during this process, blocks may tilt backward or rebound. When the landslide body encounters an intact, undamaged hazardous rock mass, the rock mass serves as a barrier, limiting the extent of the disaster and illustrating its obstructive and protective role against landslide hazards. Conversely, when the landslide body encounters a dangerous rock mass that is intersected by joints, the impact accelerates the propagation of internal cracks within the rock mass, leading to its collapse and failure. This indicates that the impact of the landslide mass serves as a trigger for the destabilization and failure of the hazardous rock mass, thereby exacerbating the scope and severity of the slope disaster. This study comprehensively reflects the temporal and spatial interaction and evolution characteristics between landslide bodies and hazardous rock masses. It demonstrates that the DDA method can effectively replicate and quantitatively analyze the deformation and failure of landslide bodies, the obstructive effects of hazardous rock masses on landslides, and the impact and collision processes between landslide bodies and hazardous rock masses. By revealing the movement characteristics and deposition features of blocks, this study provides a theoretical foundation for disaster prevention and mitigation in similar slope engineering projects.
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2025, Vol. 44 
