- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
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| Citation: | ZHENG Da, TANG Jingsong. Slope Toppling Deformation and Development Characteristics of Bending Belts by Centrifugal Model Test[J]. Journal of Southwest Jiaotong University, 2021, 56(6): 1232-1240. doi: 10.3969/j.issn.0258-2724.20200319
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Development characteristics and evolution law of the rock bending belts during the slope toppling deformation process is the key tostudying the geological development and mechanical behaviour of counter-tilt layered rock slopes in the process of deformation and failure. In order to reveal the influence of the slope angle change on the development law of the bending belts, the toppling deformation body in front of the dam of Gushui Hydropower Station of Lancang River is used as a prototype to generalize three sets of slope centrifugal test models with different slope angles. The centrifugal simulation tests were conducted in an effort to reproduce the evolution process of the toppling deformation of the counter-tilt layered rock slope and analyze the development characteristics of the rock bending belts inside the slope. The results indicate that the slope toppling deformation mainly occurs above the dumping and breaking datum plane, the angle between the datum plane and the normal of the rock bedding planes lies between 12° and 16°, and the value does not change with slope angle. In the process of slope deformation, the bending belts extends from the foot of the slope to the top of the slope in a stepped manner until it penetrates. A new secondary bending belts in the dumped rock mass generate above the primary bending belts in steep slope, and the slope failure mode gradually changes from single-level break to multi-level breaks. The evolution process of the bending belts can be generalized into three stages: rock layer toppling deformation, slope foot rupture-bending belts extending to the slope top, bending belts penetration to critical instability of slope. The slope anglechange has great influence on the development characteristics of slope toppling deformation. As the slope angle increases, slope toppling deformation expands and aggravates.
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