scholarly journals Methods to Analyze Flexural Buckling of the Consequent Slabbed Rock Slope under Top Loading

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Hongyan Liu ◽  
Guihe Wang ◽  
Feng Huang
Keyword(s):  
Calculation Method ◽  
Rock Slope ◽  
Superposition Principle ◽  
Damage Model ◽  
Friction Angle ◽  
Euler’S Method ◽  
Flexural Buckling ◽  
Linear Elastic Body ◽  
Buckling Failure ◽  
Dip Angle

The consequent slabbed rock slope is prone to flexural buckling failure under its self-weight and top loading. However, nearly none of the existing studies consider the effect of the top loading on the slope flexural critical buckling height (CBH). Therefore, on the basis of Euler’s Method and the flexural buckling failure mode of the consequent slabbed rock slope, the calculation method of the CBH of the vertical slabbed rock slope under the self-weight is firstly proposed, and then it is extended to that of the consequent slabbed rock slope. The effect of slope dip angle, friction angle, and cohesion between the neighboring rock slabs and rock elastic modulus on the slope CBH is discussed. Secondly, the calculation method of the CBH of the consequent slabbed rock slope under its self-weight and top loading is proposed according to the superposition principle. Finally, on the basis of the hypothesis that the rock mechanical behavior obeys the statistical damage model, the effect of the rock mechanical parametersnandε0on the slope CBH is studied. The results show that the rock strength has much effect on the slope CBH. If the rock is supposed to be a linear elastic body without failure in Euler’s Method, the result from it is the maximum of the slope CBH.

Limits to common toppling

1989 ◽  
Vol 26 (4) ◽  
pp. 737-742 ◽  
Author(s):  
D. M. Cruden
Keyword(s):  
Key Words ◽  
Rock Slope ◽  
Kinematic Model ◽  
Friction Angle ◽  
Angle Of Friction ◽  
Maximum Angle ◽  
Flexural Toppling

Goodman and Bray's kinematic model of common toppling can be extended to show that the maximum angle between the slope and the dip direction of the penetrative discontinuity that allows toppling depends on the friction angle of the discontinuities and the angle of the slope when the discontinuities dip into the slope. Flexural toppling can occur when the discontinuities dip in the same direction as the slope but more steeply than the slope and the angle of friction on the discontinuities. Natural examples of toppling in these extended ranges of orientations occur. Key words: toppling, discontinuity, rock slope, anaclinal, cataclinal, plagoclinal, orthoclinal, underdip.

Analysis of Rock Slope Stability Using Anti-Slide Pile

2012 ◽  
Vol 446-449 ◽  
pp. 2470-2473 ◽  
Author(s):  
Rui Gao ◽  
Ling Qiang Yang
Keyword(s):  
Rock Slope ◽  
Failure Modes ◽  
Back Analysis ◽  
Friction Angle ◽  
Lateral Force ◽  
Rock Slope Stability ◽  
Analysis Method ◽  
Transmission Method ◽  
Statistical Parameters ◽  
Determine Function

Using the measured experimental field data of two faults of a rock slope engineering, based on the large number of measured data analysis results of similar projects and rock style to determine the internal friction angle of the fault.the method of how to choose the good date was given. Back analysis method and number fitting method was used to determine the cohesion of fault; anti-slide pile is the lateral force column, the relation of the four failure modes of anti-slide pile was considered. The statistical parameters of resistance of anti-slide pile was calculated by structure mechnics. The norm recommended coefficient transmission method was used to determine function of random variables of slope sliding. The results show that using back analysis method and structure mechnics method to modify the parameter can decrease the uncertainty and improve the reliability of engineering design .

Study on Creep and Fracturing of High Antidip Sandwich Rock Slope in High In Situ Stress

2013 ◽  
Vol 405-408 ◽  
pp. 527-534
Author(s):  
Qi Wu ◽  
Xu Biao Deng
Keyword(s):  
Rock Slope ◽  
Stereographic Projection ◽  
Friction Angle ◽  
Depression Angle ◽  
In Situ Stresses ◽  
Slope Excavation ◽  
Before And After ◽  
Projection Analysis ◽  
Intersection Line

The paper set an example of high antidip sandwich rock slope to study its creep and fracturing deformation in high in-situ stresses at Jinping First Stage Hydropower Station in China. The slope creep deformation before and after excavation could be found on slope face and in exploration adits. Displacements at 4 monitoring points on the slope were abnormal for influences of fault f42-9, zone SL44-1 and lamprophyre dike, which indicate creep and fracturing of the big block separated by them. Through stereographic projection analysis, intersection of controlling structural planes of the big block direct outside the slope. Its bottom slide face, fault f42-9, has internal friction angle smaller than depression angle of the intersection line. Barricade in front of the big block removed by slope excavation decreased resistance to slope slide. It is concluded that creep and fracturing deformation of the big block is controlling stability of the slope.

scholarly journals Deformation and Stability Characteristics of Layered Rock Slope Affected by Rainfall Based on Anisotropy of Strength and Hydraulic Conductivity

Water ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 3056
Author(s):  
Chengzhi Xia ◽  
Guangyin Lu ◽  
Ziqiang Zhu ◽  
Lianrong Wu ◽  
Liang Zhang ◽  
...  
Keyword(s):  
Hydraulic Conductivity ◽  
Factor Of Safety ◽  
Rock Slope ◽  
Horizontal Displacement ◽  
Field Monitoring ◽  
Monitoring Data ◽  
Anisotropy Ratio ◽  
Conductivity Anisotropy ◽  
Layered Rock ◽  
Dip Angle

The strength and hydraulic conductivity anisotropy of rock slopes have a great impact on the slope stability. This study took a layered rock slope in Pulang, Southwestern China as a case study. The strength conversion equations of the seriously weathered rock mass were proposed. Then, considering the anisotropy ratio and anisotropy angle (dip angle of bedding plane) of strength and hydraulic conductivity, the deformation and stability characteristics of rock slope were calculated and compared with field monitoring data. The results showed that the sensitivity analysis of strength and hydraulic conductivity anisotropy could successfully predict the occurrence time, horizontal displacement (HD), and the scope of the rock landslide. When the anisotropy ratio was 0.01 and the dip angle was 30°, the calculated HD and scope of the landslide were consistent with the field monitoring data, which verified the feasibility of the strength conversion equations. The maximum horizontal displacement (MHD) reached the maximum value at the dip angle of 30°, and the MHD reached the minimum value at the dip angle of 60°. When the dip angle was 30°, the overall factor of safety (FS) and the minimum factor of safety (MFS) of the rock slope were the smallest. By assuming that the layered rock slope was homogeneous, the HD and MHD would be underestimated and FS and MFS would be overestimated. The obtained results are likely to provide a theoretical basis for the prediction and monitoring of layered rock landslides.

Modelling the flexural buckling failure of stratified rock slopes based on the multilayer beam model

2019 ◽  
Vol 16 (5) ◽  
pp. 1170-1183 ◽  
Author(s):  
Yan-jun Zhang ◽  
Ting-kai Nian ◽  
Xing-sen Guo ◽  
Guang-qi Chen ◽  
Lu Zheng
Keyword(s):  
Beam Model ◽  
Rock Slopes ◽  
Flexural Buckling ◽  
Multilayer Beam ◽  
Buckling Failure ◽  
Stratified Rock

Mechanism of Abnormal Surface Subsidence Induced by Fault Instability

2020 ◽  
Author(s):  
Gangyan Zhang
Keyword(s):  
Rock Mass ◽  
Fault Zone ◽  
Hanging Wall ◽  
Friction Angle ◽  
Soil Mass ◽  
Surface Subsidence ◽  
Surface Movement ◽  
Fault Stability ◽  
Movement And Deformation ◽  
Dip Angle

Abstract Surface movement and deformation with faults differ significantly from that without faults, which the surface movement and deformation at the fault outcrop generally abnormally increase when a fault occurs in the overlying strata and loses stability as a result of mining. To explore the mechanism of abnormal surface subsidence induced by fault instability due to mining in the hanging wall and footwall, mechanical models for the fault slip and soil cantilevers were separately established. Moreover, based on numerical and similarity simulation experiment, the difficulty degrees of fault instability were compared and analysed during mining in hanging wall and footwall. The research results show that: (1) the abnormal surface subsidence at fault outcrop is caused by fracture of soil mass at the fault outcrop due to the cantilever effect. (2) The fault zone that can be stabilised during mining in the hanging wall is broader than that during mining in the footwall, and a fault remains stable when mining in hanging wall and the surface at fault outcrop is more likely to experience stepped subsidence when mining in the footwall. (3) Fault stability worsens with the growth of the fault dip angle when mining in hanging wall, the fault is certainly subjected to slip and instability when fault dip angle is lower than the internal friction angle of the rock mass within the fault zone and fault stability strengthens with increasing fault dip angle during mining in the footwall. (4) When mining in the footwall, the ratio of shear stress to normal stress at the fault outcrop is about five times that when mining in the hanging wall and the fault is more likely to undergo slip and instability during mining in the footwall. (5) As a natural weak plane in the rock mass, a fault exerts a blocking effect on the transfer of mining-induced stress and overburden movements.

The Affecting Factors of Slope Stability Based on Orthogonal Design

2013 ◽  
Vol 690-693 ◽  
pp. 756-759 ◽  
Author(s):  
Zhao Rong Jiang ◽  
Le Hua Wang
Keyword(s):  
Slope Stability ◽  
Safety Factor ◽  
Rock Slope ◽  
Orthogonal Experiment ◽  
Orthogonal Design ◽  
Limit Equilibrium ◽  
Friction Angle ◽  
Affecting Factors ◽  
Good Test ◽  
Test Range

The orthogonal design can make sites in the test range uniformly distributed, which is introduced to slope sensitivity analysis, and can greatly reduce the test times and gets a good test effect.The paper takes the flood discharging tunnel import slope of Jinchuan hydropower station for example, which is a rock slope. This article selects the bulk density, internal friction angle, cohesion, earthquake acceleration four factors to design the orthogonal experiment, and the safety factor of the slope as a test indicators, using the simplified Bishop method of limit equilibrium theory to calculate the safety factor and analyses the slope sensitivity. The results show that the cohesion and earthquake acceleration are the most sensitive factors, and have a very significant impact on the slope stability.

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