Analysis about Stability of a Slope

2014 ◽  
Vol 580-583 ◽  
pp. 152-155
Author(s):  
Ya Jun Yin ◽  
Guang Han Xu ◽  
Yong Mei Qian
Keyword(s):  
Numerical Simulation ◽  
Slope Stability ◽  
Ratio Method ◽  
Stability Evaluation ◽  
Slope Ratio ◽  
Geological Conditions ◽  
Slope Ratio Method

Based on the engineering geological conditions of an artificial slope is analyzed using a combination of numerical simulation, the slope ratio method and other methods, the slope stability was evaluated, It has a certain reference to artificial slope stability evaluation that similar to a combination of soil and rock.

The Slope-Ratio Method of Rose and Cuttita

1972 ◽  
Vol 26 (2) ◽  
pp. 311-312 ◽  
Author(s):  
H. A. Liebhafsky ◽  
H. G. Pfeiffer ◽  
P. D. Zemany
Keyword(s):  
Ratio Method ◽  
Slope Ratio ◽  
Slope Ratio Method

Elastoplastic-damage-seepage coupling model and numerical algorithm for rock slope stability evaluation

2021 ◽  
pp. 105678952110116
Author(s):  
Mengfei Xu ◽  
Annan Jiang ◽  
Xiurong Yang ◽  
Tengfei Jiang
Keyword(s):  
Slope Stability ◽  
Numerical Algorithm ◽  
Coupling Model ◽  
Stability Evaluation ◽  
Backward Euler ◽  
Geological Conditions ◽  
Calculation Results ◽  
The Stability ◽  
Elastoplastic Damage ◽  
Slope Safety

The stability of slope under complex geological conditions is one of the essential issues in geotechnical engineering. The mechanical damage caused by external force load and the hydraulic property of rock have both significant influences on slope stability. However, the two factors and the coupling process between them are not considered in the traditional slope safety calculation method. Firstly, in this paper, an elastoplastic-damage-seepage coupling model is established based on the modified Mohr-Coulomb (M-C) criterion. This model takes into account the weakening effect of damage on the strength of rock mass. Further, according to the Biot's theory and the evolution equation of permeability coefficient, a complete hydraulic-mechanics (HM) coupling model is established. Secondly, the fully implicit backward Euler algorithm and "strict-cornered" algorithm are used to integrate the stress precisely. The complete coupling analysis of HM is implemented by the step-by-step iterative method. By combining the centrifugal loading method (CLM) with the FEM program, the factor of slope safety (FOS) under the coupling influence of damage-seepage can be solved. The calculation results showed that, compared with the traditional rounded M-C model, the results obtained by the "strict-cornered" algorithm method in this paper are closer to the theoretical solution. The solution process is robust with a global second-order convergence rate. After considering the effects of damage and seepage, the FOS is obviously reduced. Finally, the model is applied to the stability evaluation of an actual engineering. The variation rules of pore water pressure, displacement field, damage zone and FOS are calculated under different head heights. The model built in this paper considers the coupling characteristics of rock seepage-stress-damage well. The proposed numerical algorithm ensures the accuracy and rationality of the calculation results which provides a theoretical foundation for engineering application.

scholarly journals FORMULA ESTABLISHMENT OF COLORLESS Pb(II) COMPLEX WITH N-BENZOYL-N-PHENYL HYDROXYLAMINE (BPA) USING ATOMIC ABSORPTION SPECTROSCOPY

2012 ◽  
Vol 12 (1) ◽  
pp. 12-19 ◽  
Author(s):  
Dhananjay B Sarode ◽  
Sopan T Ingle ◽  
Sanjay B Attarde
Keyword(s):  
Atomic Absorption ◽  
Absorption Spectroscopy ◽  
Atomic Absorption Spectroscopy ◽  
Variation Method ◽  
Ratio Method ◽  
Slope Ratio ◽  
Mole Ratio Method ◽  
Continuous Variation Method ◽  
Slope Ratio Method

A new method for determination of stoichiometry of colorless complexes by using atomic absorption spectrophotometric technique in continuous variation method and slope ratio method was described here. This method can be used in same manner as that of mole ratio method and slope ratio method. In this method atomic absorption spectroscopy was used instead of UV-Vis spectrophotometry. Atomic absorption spectrophotometric technique is superior to UV-Vis spectrophotometry as it can be applied to colorless soluble complexes. Pb(II) and n-benzoyl-n-phenyl hydroxylamine react to form colorless complex at pH 6.5, which can be easily determined by this method. It was found that Pb(II) forms 1:2 complex with n-benzoyl-n-phenyl hydroxylamine and is quantitatively extracted back to aqueous solution for AAS analysis.

Study on Analysis of Deposits Highway Slope Stability and Treatment

2011 ◽  
Vol 105-107 ◽  
pp. 1245-1249
Author(s):  
Yi Fang Feng ◽  
Hua Zhi Zhang
Keyword(s):  
Numerical Simulation ◽  
Slope Stability ◽  
Reduction Method ◽  
Strength Reduction ◽  
Strength Reduction Method ◽  
Deformation Characteristics ◽  
High Line ◽  
Geological Conditions ◽  
Deformation Features ◽  
Simulation Results

Taking Yangjiawuchang Bridge 2 Slope Project on the national key high line of Hangzhou to Lanzhou in China as example, the deformation characteristics of typical profile 4-4’ of the deposits highway slope project was studied by means of numerical simulation (FLAC3D). Based on the deformation fields, the slope deformation features were analyzed. According to the slope coefficient that was solved by strength reduction method, the slope stability was evaluated. In consideration of numerical simulation results and field geological conditions, the combination engineering treatments of surface drainage, paring-earthwork and unloading and slope temporary protection were selected. Moreover, the paring-earthwork areas were calculated and optimized. The simulation results can be based on to guide the engineering treatment, meanwhile, the results can provide reference for the similar engineering.

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