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Numerical and theoretical study of bi-planar failure in footwall slopes
Sun, Chaoyi; Chen, Congxin; Zheng, Yun; Zhang, Wei; Liu, Feng
AbstractBi-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.
KeywordFootwall slope Bi-planar failure UDEC trigon approach Slope stability analysis Limit equilibrium method
Indexed BySCI
WOS Research AreaEngineering ; Geology
WOS SubjectEngineering, Geological ; Geosciences, Multidisciplinary
WOS IDWOS:000495469800021
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Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China;
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China;
3.Tianjin Univ, Sch Civil Engn, Tianjin 300072, Peoples R China
Recommended Citation
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):-.
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