Identification and zonation of deep-seated toppling deformation in a metamorphic rock slope

2020 ◽  
Author(s):  
Weihua Zhao ◽  
Chengqiang Zhang ◽  
Nengpan Ju
Keyword(s):  
Metamorphic Rock ◽  
Rock Slope ◽  
Toppling Deformation

Centrifuge-model test study of key hazard factors of deep toppling deformation and disaster pattern of anti-dip layered-rock slope under gravity

2020 ◽  
Author(s):  
Da Zheng ◽  
Hua Zhao
Keyword(s):  
Model Test ◽  
Rock Slope ◽  
Shear Failure ◽  
Similarity Theory ◽  
Distinct Element ◽  
Centrifuge Model Test ◽  
Centrifuge Model ◽  
Layered Rock ◽  
External Conditions ◽  
Toppling Deformation

<p>To study the toppling deformed body before construction of the dam at the Gushui hydropower station, we developed here a physical model of the slope on the basis of known local geology and of similarity theory. We simulated valley trenching by a method using prior produced block modules and three levels of excavation, and we studied key hazard factors of deep toppling deformation and the disaster pattern related to anti-dip, layered-rock slope under gravity by a five-stage centrifuge-model test and Universal Distinct Element Code numerical-simulation analysis. The results show the following: (1) The occurrence, development and destruction of deep toppling deformation of anti-dip layered rock slopes must have gone through a long geological history; the accumulation of energy and deformation is a very long process, and accelerated-deformation is closely related to changes in external conditions (such as excavation, earthquake, etc.); (2) lithologic conditions (relatively weak rock mass), structural conditions (appropriate layer thickness and dip angle), and external conditions (valley trenching or excavation of slopes) are key factors for deep toppling deformation, while the free-surface condition is the key hazard factor; (3) deep toppling deformation can lead to multilevel bending zones at different depths inside the slope after the several stages of valley trenching (multilevel excavation); the bending zone is gradually connected from the foot of the slope all the way to the top, which eventually becomes the failure boundary; and the development and connection of the bending zone may result in the overall shear failure of the slope along the bending zone; (4) for deep toppling deformation, we propose a qualitative-judgment index and quantitative-judgment indicators of the degree of toppling deformation. We derived quantitative-judgment formulas for the degree of toppling deformation and the calculation formulas were used for the maximum depth of toppling deformation, and we established a system for discrimination of destruction patterns for deep toppling deformation of anti-dip slope.</p>

scholarly journals Study on Deformation Evolution Characteristics of Reverse-Dip Rock Slope under the Influence of Rainfall

2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
Jiabing Zhang ◽  
Liangfu Xie ◽  
Xuejun Liu ◽  
Yongjun Qin ◽  
Liming Wu
Keyword(s):  
Rock Slope ◽  
Horizontal Displacement ◽  
Buffer Zone ◽  
Vertical Displacement ◽  
Displacement Monitoring ◽  
Bank Slope ◽  
Evolution Characteristics ◽  
Strong Deformation ◽  
Toppling Deformation ◽  
Dip Slope

In Southwestern China, there exists deep river valleys and abundant rainfall, which leads to a large number of reverse-dip rock slopes. In order to investigate the evolution characteristics of toppling deformation of reverse-dip slope under the influence of rainfall, and a typical reverse-dip slope was taken as an engineering case. Firstly, the temporal and spatial evolution nephogram of toppling displacement under different rainfall was obtained based on the discrete surface displacement monitoring data of bank slope. Then, taking bank slope, gully buffer zone, and development degree of bank slope as development characteristics based on geological field survey, afterward, the evolution characteristics in different strong deformation zones were analyzed by superimposing the development characteristic partition and the spatial and temporal displacement nephogram. The results showed that the horizontal displacement mainly occurred on the right front and middle rear of the bank slope while large vertical displacement occurred on the middle of the bank slope under the influence of rainfall. As the rainfall increased to the maximum, the toppling deformation reached the peak, and vertical displacement was more sensitive to the rainfall than horizontal displacement. After the superposition, the largest strong deformation zone was located in the middle and rear part of the bank slope, which is characterized by medium and high slope and mature stage and 50 m gully buffer zone. This paper explores the deformation and failure process of reverse-dip rock slope considering the change of rainfall through real displacement monitoring data and focuses on the real deformation evolution law of each characteristic zone combined with different development characteristics partition.

scholarly journals Correction to: GAMAH‑R: a new mining rock slope classification system

2021 ◽  
Author(s):  
Flávio Affonso Ferreira Filho ◽  
Romero César Gomes ◽  
Teófilo Aquino Vieira da Costa
Keyword(s):  
Classification System ◽  
Rock Slope

scholarly journals Study on rapid ecological protection of rock slope

2020 ◽  
Vol 525 ◽  
pp. 012051
Author(s):  
Yunming Aocun ◽  
Yapin Lv ◽  
Qingan Wang ◽  
Tianwei Xia
Keyword(s):  
Rock Slope ◽  
Ecological Protection
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