Numerical and theoretical study of bi-planar failure in footwall slopes
文献类型：期刊论文
| 作者 | Sun, Chaoyi; Chen, Congxin; Zheng, Yun; Zhang, Wei; Liu, Feng |
| 刊名 | ENGINEERING GEOLOGY
 |
| 出版日期 | 2019 |
| 卷号 | 260页码:- |
| 关键词 | Footwall slope Bi-planar failure UDEC trigon approach Slope stability analysis Limit equilibrium method |
| ISSN号 | 0013-7952 |
| DOI | 10.1016/j.enggeo.2019.105234 |
| 英文摘要 | Bi-planar failure is the commonest type of failure in steep and high footwall slopes. This paper presents an investigation of the bi-planar failure mechanism and a stability analysis model for footwall slopes based on the study of eleven diabase mines in Hunyuan County, Shanxi Province, China. First, a detailed investigation of the site and tests were carried out to obtain a geological model and calculation parameters for the slope. Then, the failure process in footwall slopes was investigated by a trigon approach performed using the Universal Distinct Element Code (UDEC) software package. A mechanism was then obtained for bi-planar compression-shear failure by combining the results obtained for the stress, displacement, and crack development. Subsequently, based on the limit equilibrium and frictional plasticity theories, a new columnar mechanical model was proposed for bi-planar footwall slope failure. The results demonstrate that the UDEC trigon approach was well suited to simulating bi-planar failure in steep and high footwall slopes. Employing this approach, a sliding failure surface that initiates, develops, and propagates in the discontinuity and intact rock could be correctly captured and the evolution of the damage in the toe of the slope could be quantitatively investigated. The results also indicate that shear failure first occurs at persistent discontinuities and then compression-shear failure occurs in the intact rocks. In addition, the failure surface of the rock emanates from the toe of the slope, is oriented upwards at an angle to the persistent discontinuity thus forming the through sliding surface (this angle can be determined using frictional plasticity theory). The critical heights and safety factors of footwall slopes could be readily obtained by employing this new columnar mechanical model giving results that are consistent with the results of numerical simulations. Furthermore, the results of a parameter-sensitivity analysis show that the dip angle of the toe breakout surface increases as the slope angle increases. However, the angle between the toe breakout and internal shear surfaces remains unchanged as the slope angle increases. Moreover, the critical height of the footwall slope decreases linearly as the slope angle increases. The method proposed provides theoretical guidance for the stability analysis of steep and high footwall slopes. The results produced should also help engineers to gain a better understanding of the mechanisms of bi-planar failure in such rock slopes. |
| WOS研究方向 | Engineering ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000495469800021 |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/14858]  |
| 专题 | 岩土力学所知识全产出_期刊论文 国家重点实验室知识产出_期刊论文 |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China; 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China; 3.Tianjin Univ, Sch Civil Engn, Tianjin 300072, Peoples R China |
| 推荐引用方式 GB/T 7714 | Sun, Chaoyi,Chen, Congxin,Zheng, Yun,et al. Numerical and theoretical study of bi-planar failure in footwall slopes[J]. ENGINEERING GEOLOGY,2019,260:-. |
| APA | Sun, Chaoyi,Chen, Congxin,Zheng, Yun,Zhang, Wei,&Liu, Feng.(2019).Numerical and theoretical study of bi-planar failure in footwall slopes.ENGINEERING GEOLOGY,260,-. |
| MLA | Sun, Chaoyi,et al."Numerical and theoretical study of bi-planar failure in footwall slopes".ENGINEERING GEOLOGY 260(2019):-. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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