scholarly journals Study on the influence of slope height and angle on the factor of safety and shape of failure of slopes based on strength reduction method of analysis

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Henok Marie Shiferaw
Keyword(s):  
Sandy Soil ◽  
Efficient Method ◽  
Factor Of Safety ◽  
Slope Failure ◽  
Reduction Method ◽  
Clay Soil ◽  
Slope Angle ◽  
Strength Reduction Method ◽  
Slope Factor ◽  
The Relationship

Abstract Background Decreasing slope angle and slope height increases the slope factor of safety and can change the shape of likely slope failure. The increase in the factor of safety is at different rates, which can depend on soil type and slope geometry. Understanding the relationship between the slope height and angle decrease with the increase in factor of safety is vital to implement an efficient method of increasing factor of safety for slope stability problems. In addition, the shape of slope failure has to be observed thoroughly, not to increase the sliding mass of soil for a likely slope failure, even though the factor of safety has increased. Results Three homogeneous slopes of different soil characteristics were analyzed several times by changing the slope height and angle to determine the factor of safety. The shape of failure was also observed and recorded for each slope height and angle decrease. The analysis results indicated that decreasing slope angle increases the factor of safety nearly linearly while a decrease in height increases the factor of safety at a parabolic rate. Slope height decrease increased the factor of safety at a higher rate for the clay soil while slope angle decrease increased factor of safety at a higher rate for sandy soil compared to the other types of soils considered. The toe slide was observed in clayey and sandy clay soils at higher slopes while the base slide was observed at slopes whose height is less than 2 m. The slope slide was dominant on sandy soil at different slope heights and slope angles. Conclusions While the factor of safety of slopes had increased with slope height and angle decrease, the rate of increases and thus the efficiencies are different which depended on the type of soil and geometry of slope. The shape of failure also changed which might increase the sliding mass of soil. This can be risky if slope failure occurs due to unforeseen events. Using the slope height and angle decrease methods for slope stabilization should be thoroughly investigated to choose the most efficient method and also should be checked not to increase the sliding mass of soil for a possible slope failure.

Analysis of Slope Instability Based on Strength Reduction Method

2012 ◽  
Vol 170-173 ◽  
pp. 1238-1242
Author(s):  
Xue Wei Li ◽  
Xin Yuan ◽  
Xiao Wei Li
Keyword(s):  
Plastic Zone ◽  
Reduction Method ◽  
Limit Equilibrium ◽  
Strength Reduction ◽  
Slope Instability ◽  
Strength Reduction Method ◽  
Numerical Convergence ◽  
Safety Coefficient ◽  
Reduction Coefficient ◽  
Slope Factor

Abstract. Combined the strength reduction method with ABAQUS, the development of the slope plastic strain of different reduction coefficient is obtained by constantly adjusting reduction coefficient to change the strength index of the soil. The reduction coefficient is obtained from the criterion of numerical convergence and displacement mutation and plastic zone breakthrough. Through the analysis and comparison with the results, the reduction coefficient by the criterion of displacement mutation is consistent with the result of the criterion of plastic zone breakthrough. The reduction coefficient is the safety coefficient of the slope, and compared and analyzed with the slope factor of limit equilibrium method Bishop. The result shows that the displacement mutation and the plastic zone breakthrough as criterions to judge the slope instability are reasonable.

Study on Strength Reduction Method with Two Reduction-Factors

2012 ◽  
Vol 204-208 ◽  
pp. 429-433 ◽  
Author(s):  
Ping Yang ◽  
Zhan Yuan Zhu ◽  
Zu Yin Zou
Keyword(s):  
Slope Failure ◽  
Reduction Method ◽  
Reduction Factor ◽  
Strength Reduction ◽  
Slope Instability ◽  
Strength Reduction Method ◽  
Angle Of Internal Friction ◽  
Slice Method ◽  
Special Case ◽  
Reduction Factors

Because development degree and order as well as decay rate and degree of shear strength indexes, cohesion C and angle of internal friction , are not equal as slope failure, both should have their own security reserve. For this reason, it was proposed that C and  should have different reduction-factors, rather than same about strength reduction method (SRM). And to take a slope as an example, by FLAC SRM and strength reduction slice method (SRSM), reduction-factors of the two indexes and dangerous slide surfaces of the slope were computed and comparatively analyzed under 9 different reduction conditions. The results obtained by FLAC SRM and SRSM accorded with each other well. Therefore conclusions can be drawn that different reduction conditions correspond to different two reduction-factors and dangerous slide surfaces, so that all these dangerous slide surfaces form a dangerous slide region; single reduction-factor method that reduction-factors of C and  are same is only a special case of two reduction-factors method; two reduction-factors method can just reasonably reflect respective roles of C and  as slope instability. The conclusions in turn confirm the above-mentioned viewpoint again.

Modeling Large Deformation Slope Failure Using The Smoothed Particle Hydrodynamics (SPH) Method

2021 ◽  
Author(s):  
Bunyamin Andreatama ◽  
Widjojo Adi Prakoso ◽  
Erly Bahsan ◽  
R.R. Dwinanti Rika Marthanty ◽  
Jessica Sjah
Keyword(s):  
Slope Stability ◽  
Smoothed Particle Hydrodynamics ◽  
Slope Failure ◽  
Reduction Method ◽  
Fluid Model ◽  
Bingham Fluid ◽  
Strength Reduction Method ◽  
Sph Method ◽  
Particle Hydrodynamics ◽  
Smoothed Particle

<p>The slope stability analyses using limit equilibrium method (LEM) and finite element method (FEM) are mostly concerned about the factor of safety (FS) value of the slope. LEM cannot predict the soil behaviour after failure, while FEM can only be used to measure the material deformation before failure. Currently the Smoothed Particle Hydrodynamics (SPH) method has begun to be used as an alternative to overcome excess distortion of the mesh in FEM analysis due to post-failure large deformations in slope stability analysis. In this study, the behaviour of soil materials will be modelled as particles using the SPH method with reference to the previous research. The Bingham fluid model is used as a viscoplastic model of the soil material, and the Drucker-Prager soil constitutive model is used to describe the elastic-plastic behaviour of the soil. This modelling algorithm uses the equivalent viscosity of the Bingham fluid model as the initial stress between particles, and it uses the Drucker-Prager criterion with the associated flow rule to describe particle displacement due to slope failure. The soil particles are modelled as cohesive soil with a slope angle to the horizontal axis so that they can be compared with previous studies. The failure pattern is expected to be able to show areas of particles that are not deformed and particles that have collapsed. The FS value of the slope is obtained by the strength reduction method which seeks a non-convergent solution of each reduction in soil strength parameters.</p><p>Keywords: Smoothed Particle Hydrodynamics (SPH); Slope Stability; Bingham Fluid Model; Drucker-Prager Model; Strength Reduction Method</p>

The Bearing Capacity of Footings near Slope Considering the Footing-Soil Interaction

2013 ◽  
Vol 405-408 ◽  
pp. 290-293
Author(s):  
Yang Jiang ◽  
Yun Dong ◽  
Wen Bin Sun ◽  
Bao Hai Chen
Keyword(s):  
Bearing Capacity ◽  
Slope Failure ◽  
Slope Angle ◽  
Ultimate Bearing Capacity ◽  
Linear Section ◽  
The Face ◽  
The Relationship

In some cases, structures are built on or near aslope. The ultimate bearing capacity of the foundations for these structures issignificantly affected by the presence of the slope. In this paper, the ultimate bearing capacity of footings near slopes is investigated by the finiteelement method. Consideration is given to the effect of slope angle, height ofslope, the distance from the edge of the slope to the footing, soil propertiesand the interaction between the soil and footing. Conclusions are drawn: Ingeneral, the dimensionless bearing capacity qu/γB increases with theincrease of the ratio cu/γB, the increase of L/B, and decrease ofthe slope angle β. Thecurves describing the relationship between cu/γB and qu/γBcan be characterized using three main properties, namely a linear section, anon-linear section, and zero bearing capacity point. Within the linear section,local bearing capacity failure contained to within the face of the slope; theheight of the slope does not influence the bearing capacity. In the non-linearsection, the curves of the relation (cu/γB, qu/γB) isgoverned by overall slope failure.

Study on Strength Reduction Method Based on Hinge Joint Concrete Block Slope Stability

2011 ◽  
Vol 117-119 ◽  
pp. 1391-1396
Author(s):  
Yu Qing Zhang ◽  
Yong Ning Mi ◽  
Lin Zhao ◽  
Rong Hua Sun ◽  
Ying Zhang
Keyword(s):  
Slope Stability ◽  
Reduction Method ◽  
Slope Angle ◽  
Concrete Block ◽  
Strength Reduction ◽  
Strength Reduction Method ◽  
Analysis Software ◽  
Hinge Joint ◽  
River Embankment

Slope protection is to ensure the safety of River embankment important infrastructure projects.the actual project--the Bird Island Park in Shenyang, an example of hinge joint concrete block revetment,Using the FLAC analysis software, and the finite difference method percolation theory to calculate the 29° slope angle the role of a 45kg block under the action of Slope stability safety factor,Further discussed in detail the different blocks of different slope and slope stability on the role of the quality factor of safety effects, and draw the best slope and block quality portfolio, which is the slope of reference designs and applications.

Deformation and Stability Analysis of Large Slope Based on ADINA Software

2013 ◽  
Vol 353-356 ◽  
pp. 1047-1050
Author(s):  
Bao Yuan Yuan ◽  
Wei Fan Pan ◽  
Qi Wang
Keyword(s):  
Finite Element ◽  
Slope Failure ◽  
Stress Condition ◽  
Reduction Method ◽  
Strength Reduction Method ◽  
Element Calculation ◽  
Safety Coefficient ◽  
Finite Element Software ◽  
Soft Interlayer ◽  
Mechanic Calculation

Slope failure is a kind of serious geologic disaster. This paper based on the detailed geology survey and analysis, judged the failure mode of the Pipayuan slope; Using ADINA which is professional finite element software, made mechanic calculation of slope, analyzed the stress condition and discussed the change of stress. According to the Strength Reduction Method, the slope stability safety coefficient was calculated. Results show that: the whole slope, may be slide along the soft interlayer, especially in the case in the event of heavy rainThe effectiveness is verified by the finite element calculation of slope with anti-slide pile reinforcement.

New criteria for defining slope failure using the strength reduction method

2016 ◽  
Vol 212 ◽  
pp. 63-71 ◽  
Author(s):  
Yiliang Tu ◽  
Xinrong Liu ◽  
Zuliang Zhong ◽  
Yayong Li
Keyword(s):  
Slope Failure ◽  
Reduction Method ◽  
Strength Reduction ◽  
Strength Reduction Method ◽  
New Criteria

Stability Analysis of Steep Bedding Rock Slope with Strength Reduction Method

2014 ◽  
Vol 501-504 ◽  
pp. 399-402
Author(s):  
Lin Bu ◽  
Tao Xu ◽  
Yun Jie Zhang ◽  
Qiang Xu
Keyword(s):  
Stability Analysis ◽  
Slope Failure ◽  
Failure Modes ◽  
Reduction Method ◽  
Failure Surface ◽  
Strength Reduction ◽  
Strength Reduction Method ◽  
Weak Plane ◽  
Weak Structure ◽  
Bedding Slope

Stability analysis of steep rock bedding slope with weak structure planes using strength reduction method was simulated in this paper. The post processing function can display the development condition of the plastic zone, which is the criterion for instability of the slope. Analysis with working conditions of natural circumstance, after excavation, and the slope reinforced by anchor shank after excavation were put forward. Failure modes and safety coefficients of the slope proved that weak plane is the main factor controlling slope failure. Simulation results shown that strength reduction method is appropriate in predict the shape and position of the potential failure surface of steep rock bedding slope.

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