An analytical method for quantifying the correlation among slope failure modes in spatially variable soils

2016 ◽  
Vol 76 (4) ◽  
pp. 1343-1352 ◽  
Author(s):  
Dong Zheng ◽  
Dian-Qing Li ◽  
Zi-Jun Cao ◽  
Xiao-Song Tang ◽  
Kok-Kwang Phoon
Keyword(s):  
Analytical Method ◽  
Slope Failure ◽  
Failure Modes

scholarly journals The Hydromechanical Interplay in the Simplified Three-Dimensional Limit Equilibrium Analyses of Unsaturated Slope Stability

Geosciences ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 73
Author(s):  
Panagiotis Sitarenios ◽  
Francesca Casini
Keyword(s):  
Analytical Solution ◽  
Slope Stability ◽  
Slope Failure ◽  
Failure Modes ◽  
Pore Water Pressure ◽  
Limit Equilibrium ◽  
Water Pressure ◽  
Three Dimensional ◽  
Stability Limit ◽  
Smooth Transition

This paper presents a three-dimensional slope stability limit equilibrium solution for translational planar failure modes. The proposed solution uses Bishop’s average skeleton stress combined with the Mohr–Coulomb failure criterion to describe soil strength evolution under unsaturated conditions while its formulation ensures a natural and smooth transition from the unsaturated to the saturated regime and vice versa. The proposed analytical solution is evaluated by comparing its predictions with the results of the Ruedlingen slope failure experiment. The comparison suggests that, despite its relative simplicity, the analytical solution can capture the experimentally observed behaviour well and highlights the importance of considering lateral resistance together with a realistic interplay between mechanical parameters (cohesion) and hydraulic (pore water pressure) conditions.

scholarly journals Comprehensive Method to Test the Stability of High Bedding Rock Slop Subjected to Atomized Rain

2020 ◽  
Vol 10 (5) ◽  
pp. 1577
Author(s):  
Zheng-jun Hou ◽  
Bao-quan Yang ◽  
Lin Zhang ◽  
Yuan Chen ◽  
Geng-xin Yang
Keyword(s):  
Slope Failure ◽  
Rock Slope ◽  
Evaluation Method ◽  
Failure Modes ◽  
Similarity Theory ◽  
Fem Simulation ◽  
Strength Reduction ◽  
Comprehensive Method ◽  
The Stability ◽  
Bedding Rock Slope

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.

Failure Mode Analysis of Bedding Rock Slope Affected by Rock Mass Structural Plane

2014 ◽  
Vol 602-605 ◽  
pp. 594-597 ◽  
Author(s):  
En An Chi ◽  
Tie Jun Tao ◽  
Ming Sheng Zhao ◽  
Qiang Kang
Keyword(s):  
Rock Mass ◽  
Slope Failure ◽  
Failure Modes ◽  
Shear Stiffness ◽  
Mode Analysis ◽  
Structural Plane ◽  
Plane Failure ◽  
Failure Mode Analysis ◽  
Dip Angle ◽  
The Impact

Based on the discrete element numerical simulation, the change of failure modes of slope influenced by parameters of rock mass structural plane is studied. It is shown the failure modes shift gradually from the bedding sliding failure modes to the sliding-bending failure modes with the increase of the strength of the rock mass structural plane; The slope failure modes are mainly sliding failure modes with the increasing of the normal and shear stiffness and spacing of rock structural plane. Failure modes shift from shearing slip failure modes to shearing slip and buckling failure modes and finally to the tilting failure modes with the increase of the rock structural plane dip angle. The impact of the rock structural plane cohesion to the slope stability is the greatest, and the stiffness is the least.

scholarly journals Classification of Red-Bed Rock Mass Structures and Slope Failure Modes in South China

Geosciences ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 273 ◽  
Author(s):  
Cuiying Zhou ◽  
Xu Yang ◽  
Yanhao Liang ◽  
Zichun Du ◽  
Zhen Liu ◽  
...  
Keyword(s):  
Rock Mass ◽  
South China ◽  
Slope Failure ◽  
Failure Modes ◽  
Hard Rock ◽  
Soft Rock ◽  
Red Beds ◽  
Rock Falls ◽  
Geological Formation ◽  
Red Bed

Red beds are Meso–Cenozoic continental sedimentary strata that are mainly composed of gravel stone, sandstone, siltstone, mudstone, and shale and occasionally have interlayers of limestone, halite, and gypsum. As a typical rock mass, red beds are widely distributed throughout South China. In a typical tropical and subtropical continental environment, red beds are the product of multiple sedimentary cycles, which have resulted in complicated rock mass structures that play an important role in rock mass stability. It is thus of great significance to investigate the influence of different rock mass structures on the stability of red-bed slopes. In this paper, the geological formation history of red beds in South China is described. The main features of red-bed rock mass slopes in South China are discussed. The main combinations of inner geomechanical structures comprise: (1) mega-thick soft rock structures; (2) mega-thick hard rock structures; (3) thick hard rock structures with weak intercalation; and (4) soft–hard interbedded structures. In addition, the features of slope failure are analyzed, and four common failure modes are identified from the statistical data: (a) weathering spalling and scouring; (b) rock falls; (c) landslides; and (d) tensile dumping.

scholarly journals The influence of clay content on submarine slope failure: insights from laboratory experiments and numerical models

2020 ◽  
Vol 500 (1) ◽  
pp. 301-309 ◽  
Author(s):  
M. M. W. Silver ◽  
B. Dugan
Keyword(s):  
Pore Pressure ◽  
Slope Failure ◽  
Failure Modes ◽  
Initial Conditions ◽  
Numerical Models ◽  
Clay Content ◽  
Passive Margin ◽  
Slope Failures ◽  
Submarine Slope ◽  
Failure Evolution

AbstractSubmarine slope failures pose risks to coastlines because they can damage infrastructure and generate tsunamis. Passive margin slope failures represent the largest mass failures on Earth, yet we know little about their dynamics. While numerous studies characterize the lithology, structure, seismic attributes and geometry of failure deposits, we lack direct observations of failure evolution. Thus, we lack insight into the relationships between initial conditions, slope failure initiation and evolution, and final deposits. To investigate submarine slope failure dynamics in relation to initial conditions and to observe failure processes we performed physical experiments in a benchtop flume and produced numerical models. Submarine slope failures were induced under controlled pore pressure within sand–clay mixtures (0–5 wt% clay). Increased clay content corresponded to increased cohesion and pore pressure required for failure. Subsurface fractures and tensile cracks were only generated in experiments containing clay. Falling head tests showed a log-linear relation between hydraulic conductivity and clay content, which we used in our numerical models. Models of our experiments effectively simulate overpressure (pressure in excess of hydrostatic) and failure potential for (non)cohesive sediment mixtures. Overall our work shows the importance of clay in reducing permeability and increasing cohesion to create different failure modes due to overpressure.

Bolted Joints Modeling Techniques, Analytical, Stochastic and FEA Comparison

2012 ◽  
Author(s):  
Yosef Amir ◽  
S. Govindarajan ◽  
Saravanakumar Iyyanar
Keyword(s):  
Analytical Method ◽  
Failure Modes ◽  
Extreme Values ◽  
Bolted Joints ◽  
Critical Parameters ◽  
Stochastic Methods ◽  
Bolted Joint ◽  
Advantages And Disadvantages ◽  
Parameter Variations ◽  
Modeling Techniques

Bolted joints Design analyses are in general, very complex and it is very difficult to find a single technique to study the complete behavior of the bolted joints. The most popular analytical method is the well-known VDI 2230 which addresses most of the cases very well. This analytical method uses extreme values for critical parameter variations and is considered to be conservative, but the quickest method. Stochastic analysis is a more advanced method where variations in critical parameters are modeled as statistical distributions and Monte Carlo simulations allow predicting the behaviors of bolted joints through selective parameter variations. Finite element analysis of bolted joints is another methodology to analyze complex bolted joint designs. Though advances in FE modeling techniques help to model bolted joints more accurately, different failure modes require different modeling techniques. For practical complex bolted joints design analysis, a hybrid of analytical and different FEA models is needed for a full analysis; but a combination of FEA techniques can be used to study any bolted joint in detail for all the failure modes. Hence, it is important to study and understand the limitations of each of the modeling techniques. This paper looks at analytical and stochastic methods of bolted joints as well as three different FEA methods — 3D, Axisymmetric and Beam & Rigid Spider — to study different failure modes. Parametric (DOE) FEA simulation technique for variation parameters bolted joint behavior prediction was investigated; this paper examined the DOE parameter of coefficient of friction. A general case study is used as benchmark for comparison between the techniques and to quantify the advantages and disadvantages of each method.

scholarly journals Model Tests on the Retaining Walls Constructed from Geobags Filled with Construction Waste

2016 ◽  
Vol 2016 ◽  
pp. 1-13 ◽  
Author(s):  
Hua Wen ◽  
Jiu-jiang Wu ◽  
Jiao-li Zou ◽  
Xin Luo ◽  
Min Zhang ◽  
...  
Keyword(s):  
Slope Failure ◽  
Failure Modes ◽  
Retaining Wall ◽  
Retaining Walls ◽  
Model Tests ◽  
Construction Waste ◽  
Weak Part ◽  
Earth Pressures ◽  
Horizontal Wall ◽  
Horizontal Displacements

Geobag retaining wall using construction waste is a new flexible supporting structure, and the usage of construction waste to fill geobags can facilitate the construction recycling. In this paper, model tests were performed on geobag retaining wall using construction waste. The investigation was concentrated on the slope top settlement, the distribution characteristics of the earth pressures on retaining walls and horizontal wall displacements, and slope failure modes. The results indicated that the ultimate loads that the slope tops with retaining walls could bear were 87.5%~125% higher than that of the slope top without retaining walls. The ultimate loading of strengthened slopes with different slope ratios from 1 : 0.75 to 1 : 0.25 could be reduced by 11.8% to 29.4%. The horizontal displacements of the retaining walls constructed from geobags were distributed in a drum shape, with the greatest horizontal displacements occurring about 1/3~1/2 of the wall height away from the bottom of the wall. As the slope ratio increased, the failure of the slope soil supported by geobag retaining wall using construction waste changed from sliding to sliding-toppling (dominated by sliding) and then to toppling-sliding (dominated by toppling). The range of 1/3~1/2 of wall height is the weak part of the retaining walls, which should be strengthened with certain measures during the process of design and construction.

The Failure Mode Analysis of Open Pit Slope Base on Finite Element Method

2013 ◽  
Vol 405-408 ◽  
pp. 35-39 ◽  
Author(s):  
Hai Dong Meng ◽  
Yan Xu ◽  
Dong Yuan Zang
Keyword(s):  
Finite Element Method ◽  
Slope Failure ◽  
Failure Modes ◽  
Open Pit ◽  
Mode Analysis ◽  
Geological Model ◽  
Failure Model ◽  
Safe Production ◽  
Failure Mode Analysis ◽  
South Slope

This paper is aimed at analysing the slope failure model for an open pit slope. Firstly, The method of engineering geological survey is carried out for the open pit south slope. Then, the appropriate geological model is established. And the slope model of the open pits was established and solved by finite elemen program. The analysis reveals the internal sliding of the open-cut and the failure modes of bottom sliding along the base weak level. It will be an important guiding significance for the safe production of open pit coal mine.

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