Safety factors for the stability of structures

1968 ◽  
Vol 2 (6) ◽  
pp. 500-503 ◽  
Author(s):  
R. R. Chugaev
Keyword(s):  
Safety Factors ◽  
The Stability ◽  
Stability Of Structures

Analyse expérimentale de l'effet d'un couvert de glace sur la propagation de l'onde de rupture de barrage

2000 ◽  
Vol 27 (5) ◽  
pp. 1082-1087 ◽  
Author(s):  
Musandji Fuamba ◽  
Claude Marche ◽  
Tung Quach
Keyword(s):  
Pressure Wave ◽  
Ice Cover ◽  
Force Balance ◽  
Dam Safety ◽  
Safety Factors ◽  
Ice Load ◽  
Winter Conditions ◽  
The Stability ◽  
Stability Of Structures

Lengthy winter conditions such as those known in the province of Quebec require that one takes the presence of an ice cover into account in the determination of instantaneous safety factors for dams established in cascade and under the effect of a break wave. Not only should the ice load on the structure be considered but also the effects of the pressure wave that is propagated under the ice cover. This study shows that the method currently used to determine the stability of structures subject to a break wave is incomplete. The results obtained in laboratory indeed indicate that the presence of the ice cover increases the sur-elevation and sur-pressure values of both components of the break wave. This might perturb the stabilizing force balance of the downstream dam and increases its risk of failure.Key words: dam safety, break wave, ice cover, sur-pressure, dynamic load.[Journal translation]

Overburden Rock Stability Analysis of Shallow Tunnel

2011 ◽  
Vol 105-107 ◽  
pp. 1304-1307
Author(s):  
Yun Long Wang ◽  
Zhong Sheng Tan
Keyword(s):  
Jiaozhou Bay ◽  
Decisive Role ◽  
Overburden Rock ◽  
Safety Factors ◽  
Tunnel Stability ◽  
Rock Stability ◽  
Subsea Tunnel ◽  
The Stability ◽  
The Moment ◽  
Elastic Foundation Beam

As for shallow tunnels through the rock layers, the stability of the overburden rock has a decisive role on the tunnel stability; furthermore, analyzing the stability of the overburden rock is very important to the supporting design and the choice of excavation method. Method of elastic foundation beam is used to research the moment of overburden rock, and the formula of overburden rock stable thickness is finished. Seven sections of JIAOZHOU Bay Subsea Tunnel are took for example to analyze the safety factor of different span and overburden rock thickness, then the stability of overburden rock is analyzed. The results show that the overburden rock safety factors of these seven sections of JIAOZHOU Bay Subsea Tunnel are range from 0.65 to 0.85. Compared with the experimental results, theoretical analysis of the results are more consistent The actual example verifies that the overburden rock stability in this paper is feasible.

On Numerical Results of Reticulated Shell Buckling

1992 ◽  
Vol 7 (4) ◽  
pp. 299-319 ◽  
Author(s):  
Heinrich Rothert ◽  
Norbert Gebbeken
Keyword(s):  
Path Following ◽  
Shell Structures ◽  
Element Analysis ◽  
Economical Analysis ◽  
Shell Buckling ◽  
Stiffness Matrices ◽  
Load Carrying ◽  
The Stability ◽  
Stability Of Structures ◽  
Path Following Algorithms

This paper is mainly focused on the numerical methods which are used to calculate realistically the load-carrying behaviour of reticulated shell structures. It is generally assumed that for an economical analysis, aimed at the saving of material, the material non-linearity has to be taken into consideration if dead loads prevail. For this in the context of finite element analysis the stiffness matrices of elastic and elastic-plastic rod elements are presented. In order to ensure the stability of structures it is indispensable to detect limit loads such as snap-through loads and bifurcation loads. Assuming that snap-through phenomena are quasi static, path-following algorithms can be implemented to trace the load-deflection curves in the postbuckling domain. The testing of the reliability and stability of the algorithms requires a sufficient number of numerical examples. Few will be presented.

Indicative assessment of the financial and economic security of the area: Practical approval of the method

2021 ◽  
Vol 19 (11) ◽  
pp. 2141-2157
Author(s):  
Tat'yana N. ROGOVA
Keyword(s):  
Economic Security ◽  
Regional Security ◽  
Threshold Values ◽  
Safety Factors ◽  
Security Metrics ◽  
Socioeconomic System ◽  
Ulyanovsk Oblast ◽  
The Stability ◽  
Negative Factors ◽  
Over Time

Subject. This article considers the financial and economic security of an area as a complex system. Objectives. The article aims to develop and test a methodology for assessing regional financial and economic security based on a system of indicators divided into metrics. Methods. For the study, I used a statistical analysis and the indicative approach. Results. The article defines the integral safety factors of the Ulyanovsk Oblast, as well as a set of indicators and their threshold values for financial and economic security metrics. Conclusions. The article notes that the number of negative factors that can adversely affect the overall level of regional security and reduce the stability of the regional socioeconomic system has increased over time.

Stability Analysis of Dump Slope Based on FEM Strength Reduction Method

2014 ◽  
Vol 501-504 ◽  
pp. 51-55 ◽  
Author(s):  
Chao Peng ◽  
Dong Ji ◽  
Liang Zhao ◽  
Zhen Yu Qian ◽  
Fen Hua Ren
Keyword(s):  
Safety Factor ◽  
Reduction Method ◽  
Strength Reduction ◽  
Production Costs ◽  
Open Pit ◽  
Strength Reduction Method ◽  
Reduction Algorithm ◽  
Safety Factors ◽  
Dump Slope ◽  
The Stability

An analysis on safety factor of slope through c - φ reduction algorithm by finite elements method is presented. When the system reaches instability, the numerical non-convergence occurs simultaneously. The safety factor is then obtained by c φ reduction algorithm. This paper, which combines with the actual situation of Jinduicheng open pit mine, analysis the stability of the limit height of the dump based on strength reduction of finite element method. And the value of slope safety factor is 1.25 to 1.30. The results show that calculating safety factors of the slope by ANSYS is in full conformity with the basic requirement of safety. That means, the dump is stable, which can reduce the production costs and benefit the enterprise.

scholarly journals Failure Process and Stability Analysis of Rock Blocks in a Large Underground Excavation Based on a Numerical Method

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Shijie Chen ◽  
Ming Xiao ◽  
Juntao Chen
Keyword(s):  
Stability Analysis ◽  
Numerical Analysis ◽  
Numerical Method ◽  
Failure Process ◽  
Surrounding Rock ◽  
Underground Excavation ◽  
Analysis Method ◽  
Safety Factors ◽  
Geological Conditions ◽  
The Stability

A numerical analysis method for block failure is proposed that is based on continuum mechanics. First, a mesh model that includes marked blocks was established based on the grid-based block identification method. Then, expressions of the contact force under various contact states were derived based on the explicit contact force algorithm, and a contact simulation method between blocks and the surrounding rock was proposed. The safety factors of the blocks were calculated based on the strength reduction method. This numerical analysis method can simulate both the continuous deformation of the surrounding rock and the discontinuous failure processes of the blocks. A simple example of a sliding block was used to evaluate the accuracy and rationality of the numerical method. Finally, combined with a deep underground excavation project under complex geological conditions, the stability of the blocks and rock were analyzed. The results indicate that the key blocks are damaged after excavation, the potentially dangerous blocks loosen and undergo large deformations, and the cracks between the blocks and the rock gradually increase as the excavation proceeds. The safety factors of the blocks change during the excavation. The numerical results demonstrate the influence of the surrounding rock on the failure process and on the stability of the blocks, and an effective analysis method is provided for the stability analysis of blocks under complex geological conditions.

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