Dynamic failure mode and energy-based identification method for a counter-bedding rock slope with weak intercalated layers

In the construction of high dams, many high rock slope failures occur due to flood discharge atomized rain. Based on the steel frame lifting technique and strength reduction materials, a comprehensive method is proposed in this paper to study the stability of high bedding rock slope subjected to atomized rain. The safety factor expression of the comprehensive method and the evaluation method for deformation instability were established according to the similarity theory of geomechanical model, failure criterion, and mutation theory. Strength reduction materials were developed to simulate the strength reduction of structural planes caused by rainfall infiltration. A typical test was carried out on the high bedding rock slope in the Baihetan Hydropower Station. The results showed that the failure modes of the bedding rock slope were of two types: sliding–fracturing and fracturing–sliding. The first slip block at the exposed place of the structural plane was sliding–fracturing. Other succeeding slip blocks were mainly of the fracturing–sliding type due to the blocking effect of the first slip block. The failure sequence of the slip blocks along the structural planes was graded into multiple levels. The slip blocks along the upper structural planes were formed first. Concrete plugs had effective reinforcement to improve the shear resistance of the structural planes and inhibit rock dislocation. Finite element method (FEM) simulation was also performed to simulate the whole process of slope failure. The FEM simulation results agreed well with the test results. This research provides an improved understanding of the physical behavior and the failure modes of high bedding rock slopes subjected to atomized rain.

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Geological Characteristics' Structural Indication of Weak Intercalated Layer in Consequent Bedding Rock Slope

Geological Engineering: Proceedings of the 1 ◽

10.1115/1.802922.paper83 ◽

2010 ◽

pp. 1-7

Author(s):

Yongjun Xiao ◽

Kunlong Yin

Keyword(s):

Rock Slope ◽

Geological Characteristics ◽

Weak Intercalated Layer ◽

Structural Indication ◽

Bedding Rock Slope

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The Influence of Mode-Mixity on Dynamic Failure Mode Transitions in Polycarbonate

Journal de Physique IV (Proceedings) ◽

10.1051/jp4:19973145 ◽

1997 ◽

Vol 07 (C3) ◽

pp. C3-861-C3-866 ◽

Cited By ~ 1

Author(s):

D. Rittel ◽

R. Levin ◽

H. Maigre

Keyword(s):

Failure Mode ◽

Dynamic Failure ◽

Mode Mixity ◽

Mode Transitions

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Numerical Simulation Study on the Failure Mechanism of Bedding Rock Slope Based on the Lagrangian Multiplier Method

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.513-517.2603 ◽

2014 ◽

Vol 513-517 ◽

pp. 2603-2606

Author(s):

Fei Yu ◽

Yu Zhang ◽

Shan Xiong Chen ◽

Jian Li

Keyword(s):

Rock Slope ◽

Mechanical Response ◽

Contact Friction ◽

Lagrangian Multiplier ◽

Weak Formulation ◽

Discrete Equations ◽

Contact Constraint ◽

The Status ◽

Lagrangian Multiplier Method ◽

Bedding Rock Slope

The weak formulation of the Lagrangian control equations considering the contact constraint conditions and the FEM discrete equations have been derived. The non-linear and non-smooth problems of the mechanical response are solved perfectly by adopting the suggestion method for which tolerance large tangential slipping of the contact surface. One excavation bedding rock slope of the Hu-Rong-Xi expressway is analyzed applying the method mentioned above. The distribution rules of the displacement, stress, strain, contact state, contact friction force and sliding distance under the status of critical sliding are obtained. The analysis results indicate that the failure of the bedding slope is a progressive course. The interlayer stagger firstly, then the deformation evaluates to creep bedding slip and the bottom rock occurs buckling slip at last. The destruction model changes form the bedding slide to rock buckling slip.

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