Safety factor analysis of a tunnel face with an unsupported span in cohesive-frictional soils

2020 ◽  
Vol 117 ◽  
pp. 103221 ◽  
Author(s):  
Xiao Zhang ◽  
Mingnian Wang ◽  
Jiawang Li ◽  
Zhilong Wang ◽  
Jianjun Tong ◽  
...  
Keyword(s):  
Factor Analysis ◽  
Safety Factor ◽  
Tunnel Face ◽  
Frictional Soils

scholarly journals Face Stability Analysis of Shield Tunnels in Homogeneous Soil Overlaid by Multilayered Cohesive-Frictional Soils

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Kaihang Han ◽  
Chengping Zhang ◽  
Wei Li ◽  
Caixia Guo
Keyword(s):  
Failure Mechanism ◽  
Shear Failure ◽  
Three Dimensional ◽  
Earth Pressure ◽  
Support Pressure ◽  
Tunnel Face ◽  
Arch Effect ◽  
Theory Approximation ◽  
Homogeneous Soil ◽  
Frictional Soils

In order to better interpret failure features of the failure of soil in front of tunnel face, a new three-dimensional failure mechanism is proposed to analyze the limit support pressure of the tunnel face in multilayered cohesive-frictional soils. The new failure mechanism is composed of two truncated cones that represent the shear failure band and a distributed force acting on the truncated cones that represents the pressure arch effect. By introducing the concept of Terzaghi earth pressure theory, approximation of limit support pressures is calculated using the limit analysis methods. Then the limit support pressures obtained from the new failure mechanism and the existing approaches are compared, which show that the results obtained from the new mechanism in this paper provide relatively satisfactory results.

scholarly journals Factors impacting Purchase Behaviour of Automobiles Post Covid-19

2021 ◽  
Vol 57 (9) ◽  
pp. 6154-6161
Author(s):  
Sachin Shetty
Keyword(s):  
Factor Analysis ◽  
Literature Review ◽  
Safety Factor ◽  
Economic Factor ◽  
Statistical Technique ◽  
Brand Trust ◽  
Single Factor ◽  
Key Factor ◽  
Changing Trend ◽  
Vehicle Purchase

Vehicle Purchase has been rapidly increasing and since last decade the automobile sector has been growing in double digits in India. There are several factors considered by an individual during the purchase of automobile. With the changing trend and with the pandemic situation safety has also been a key factor that adds into it. This paper tries to examine the factors impacting the purchase behaviour. Initially the literature review aims at finding out the significant variables that act as components in purchase of a vehicle. Subsequently, the paper uses statistical technique of Exploratory factor analysis ( EFA ) to club the different variables into single factor. It was found that 21 variables fall into 6 factors namely Brand trust, Socio-demographic factor, Economic factor, Product and tech factor, Psychographic & safety factor and Govt infra & policies factor

Stability analysis model for a tunnel face reinforced with bolts and an umbrella arch in cohesive-frictional soils

2020 ◽  
Vol 124 ◽  
pp. 103635 ◽  
Author(s):  
Xiao Zhang ◽  
Mingnian Wang ◽  
Zhilong Wang ◽  
Jiawang Li ◽  
Siguang Zhao ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Analysis Model ◽  
Tunnel Face ◽  
Umbrella Arch ◽  
Frictional Soils

scholarly journals Upper Bound Solution of Safety Factor for Shallow Tunnels Face Using a Nonlinear Failure Criterion and Shear Strength Reduction Technique

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Fu Huang ◽  
Zai-lan Li ◽  
Tong-hua Ling
Keyword(s):  
Safety Factor ◽  
Upper Bound ◽  
Reduction Technique ◽  
Nonlinear Failure Criterion ◽  
Upper Bound Theorem ◽  
Tunnel Face ◽  
Bound Solution ◽  
Strength Reduction Technique ◽  
Bound Theorem ◽  
The Stability

A method to evaluate the stability of tunnel face is proposed in the framework of upper bound theorem. The safety factor which is widely applied in slope stability analysis is introduced to estimate the stability of tunnel face using the upper bound theorem of limit analysis in conjunction with a strength reduction technique. Considering almost all geomaterials following a nonlinear failure criterion, a generalized tangential technique is used to calculate the external work and internal energy dissipation in the kinematically admissible velocity field. The upper bound solution of safety factor is obtained by optimization calculation. To evaluate the validity of the method proposed in this paper, the safety factor is compared with those calculated by limit equilibrium method. The comparison shows the solutions derived from these two methods match each other well, which shows the method proposed in this paper can be considered as effective.

scholarly journals Perancangan dan Analisis Tegangan pada Desain Footrest Sepeda Motor Menggunakan Autodesk Inventor

2021 ◽  
Vol 14 (1) ◽  
pp. 1-5
Author(s):  
Dhea Nuni Ananda ◽  
Rizal Hanifi ◽  
Aa Santosa
Keyword(s):  
Factor Analysis ◽  
Safety Factor ◽  
Static Load ◽  
The Public ◽  
Modern Times ◽  
Mode Of Transportation ◽  
Minimum Safety Factor

Motorbikes are widely chosen by the public as a mode of transportation in modern times, one of which is the automatic scooter type motorcycle. Visually, the matic scooter type motorcycle components have a nice and attractive shape, but this shape does not necessarily guarantee its safety. Not a few of these components have failed (broken) as happened to the footrest. Footrest is a component of a motorcycle vehicle that functions as a footrest for motorcycle passengers. Every different type of motorbike, the footrest shape is also different. The purpose of this study is to design a footrest design and analyze it with the help of software to obtain a footrest design that has a high safety factor value. The design of the motorcycle footrest design produces 3 different designs. The three designs were analyzed using the Autodesk Inventor 2017 software stress by providing a static load of 20 Kg and 90 Kg. From the analysis, the minimum safety factor value obtained from each footrest design against a load of 20 kg in design 1 is 13.42, design 2 is 5.7, and design 3 is 7.93. While the minimum safety factor value generated from each footrest design against a load of 90 kg in design 1 is 2.98, design 2 is 1.27, and design 3 is 1.76. Based on the results of the safety factor analysis carried out, the three designs are safe enough to withstand loads of 20 Kg and 90 Kg. But design 1 is safer because the resulting value of the safety factor is higher than the three designs, which is 2.98 to withstand a load of 90 Kg.

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