Study on deformation and failure law of soft-hard rock interbedding toppling slope base on similar test
- PDF / 4,064,515 Bytes
- 13 Pages / 595.276 x 790.866 pts Page_size
- 72 Downloads / 173 Views
ORIGINAL PAPER
Study on deformation and failure law of soft-hard rock interbedding toppling slope base on similar test Menglong Dong 1
&
Faming Zhang 1 & Jingqing Lv 2 & Mengjiao Hu 3 & Zinan Li 1
Received: 10 May 2019 / Accepted: 7 May 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The phenomenon of toppling deformation and failure is ubiquitous in layered anti-dip rock slope. In this paper, the development process of toppling deformation and failure is simulated by similar tests. In the test, the rock test model of soft-hard interbedding is established by the law of similarity. Based on the test results, the process of soft-hard interbedded rock toppling deformation is simulated, and six stages (five stages in actual) of the toppling process are summarized. The characteristics in each stage are described, respectively. The relationship between displacement-time and stress-strain in the process of deformation is systematically analyzed and studied. Besides, numerical simulation tests are carried out by using the three-dimensional discrete element software 3DEC to consider the effects of different lithologic ratios on the toppling deformation and failure modes. The influence of joints on the toppling deformation is also considered, which corresponds to the characteristics of the toppling deformation before and after the occurrence of cracks. Keywords Toppling deformation . Similarity test . Numerical simulation . 3DEC
Introduction Toppling deformation is one of the most common failures in rock layered slope. It is widely existing in the fields of hydropower station, mining, transportation, and urban construction, which may cause many catastrophic accidents, such as the instability accident of the Brilliant artificial excavating slope in the USA, the rock mass collapse accident of the Ghurgar anti-dip toppling slope in Peru, the instability failure of the sandy conglomerate slope in the Jinchuan open-pit mine in China, and the phosphorus mine failure of Yanchi River in China (284 deaths) (Tan et al. 2009). These geological disasters caused by toppling deformation have brought casualties and property losses.
* Menglong Dong [email protected] 1
School of Earth Science and Engineering, Hohai University, Nanjing, China
2
Fujian Huadong Geotechnical Engineering Corporation Limited, Fuzhou, China
3
Zhongnan Engineering Corporation Limited, Changsha, China
In some large-scale hydropower projects in China, there are a large number of slope toppling deformation and failure phenomena in rock slope. These toppled and deformed rock masses have brought difficulties and additional treatment costs to the construction of hydropower stations. The formation mechanism and deformation law of the toppling rock slope, as well as the stability problem, affect the safe operation of hydropower stations. It is necessary to systematically analyze this kind of deformation, including summarizing its genetic mechanism and development characteristics. Toppling failure is a typical instability form of
Data Loading...
