scholarly journals A new slip surface in noncohesive slopes

2022 ◽  
Vol 1212 (1) ◽  
pp. 012033
Author(s):  
J A Repadi ◽  
F Bari ◽  
F A Ismail ◽  
A Andriani ◽  
A Hakam
Keyword(s):  
Experimental Method ◽  
Slip Surface ◽  
Experimental Testing ◽  
Testing Methods ◽  
Sand Material ◽  
Slope Safety

Abstract Determining the slope slip surface is difficult, prominent and uncertain. Slip-surface are utilized to estimate slope safety. This study aimed at investigating the slip surface caused by statistical loads by using experimental testing methods. The experimental method was conducted by providing a statistical load on the sand slope The load was used until the slope collapsed. Sand slopes were modeled in a glass box measuring 110 cm x 40 cm x 10 cm. The sand material used was sand that passed through sieve no.10 and was held by sieve no. 200. At a distance of 2.5 cm horizontally and at a distance of 5 cm vertically, colored marks were used to see the pattern of grain movement. Observations were conducted until the slope collapsed. The collapse pattern revealed in the experimental method is non-circular.

Novel Experimental Method to Determine the Performance of Vacuum Insulated Tubing VIT for Deepwater Applications

2021 ◽  
Author(s):  
I.. Ceyhan ◽  
S.. Vasantharajan ◽  
P. V. Suryanarayana ◽  
U. B. Sathuvalli ◽  
A.. Helou ◽  
...  
Keyword(s):  
Experimental Method ◽  
Experimental Testing ◽  
Element Analysis ◽  
Sample Test ◽  
Geothermal Wells ◽  
Different Temperatures ◽  
Measured Flow ◽  
Annular Pressure Buildup ◽  
Data Reduction Method ◽  
Analytical Tools

Abstract Vacuum insulated tubing (VIT) is a specialized tubular designed to minimize heat loss from production or injection fluids to the environment in oil, gas and geothermal wells. VIT strings are used in deepwater wells for flow assurance or to mitigate annular pressure buildup. VIT use requires accurate knowledge of its insulating performance. Although VIT performance can be estimated from analytical tools, such as finite element analysis (FEA), an experimental approach provides a more direct measurement and can be used to validate analytical tools. We have developed a new experimental method to address this need. In this method, one or two VIT joints are placed in an ice-water bath. A precisely measured flow of heated air flows inside the VIT. The temperature change of the flowing air is measured between the inlet and outlet of the VIT test specimen. The insulating performance of the VIT is then calculated from this temperature difference using heat exchanger theory with effectiveness-number of transfer units (&#ξ03B5;-NTU) approach. A proportional-integral-derivative (PID) controller is used to control the air temperature at the VIT inlet by regulating power to the heater. This paper illustrates the data reduction method and uncertainty analysis using sample test data. The method allows for rapid measurement of VIT performance at many different temperatures, with the air flow rate being used to optimize the test sensitivity and to reduce experimental uncertainty. As currently designed, the apparatus is able to test single- and double-joint VITs with effective body conductivities between 0.002-0.1 W/m/°C (0.001-0.06 Btu/hr/ft/°F) and temperatures up to 400°C (750°F); however, the design allows the apparatus to be modified easily for higher or lower conductivities. Although designed for VIT, this method may be applied to other types of tubulars. Currently, there is no widely accepted standard method for experimental testing of VIT performance, and it is hoped that this new method may evolve to an industry standard.

scholarly journals Selected Problems of Experimental Testing Marine Stern Tube Bearings

2019 ◽  
Vol 26 (2) ◽  
pp. 142-154
Author(s):  
Agnieszka Barszczewska ◽  
Ewa Piątkowska ◽  
Wojciech Litwin
Keyword(s):  
Experimental Testing ◽  
Experimental Tests ◽  
Main Shaft ◽  
Testing Methods ◽  
Wide Range

Abstract This paper presents typical methods for conducting experimental tests on main shaft slide bearings. There are described their possible testing capabilities, advantages, drawbacks and limitations. Various testing methods were analyzed to find a solution able of providing a wide range of possible investigations at possibly acceptable limitations.

scholarly journals IMPROVEMENT OF THEORETICAL COMPETENCE OF BEGINNER ATHLETES IN CYCLIC SPORTS

2020 ◽  
Author(s):  
Viktoriia Bohuslavska ◽  
Іvan Hlukhov ◽  
Maryn Pityn
Keyword(s):  
Theoretical Analysis ◽  
Experimental Testing ◽  
Training System ◽  
General Level ◽  
Initial Training ◽  
Testing Methods ◽  
Interactive Tools ◽  
Literary Sources ◽  
Legislative Framework ◽  
Effectiveness Of Training

Introduction. Despite the constant modernization of the athletes’ training system, as well as the existing legislative framework aimed at innovative transformations in the field of physical education and sports, currently, there is no information on the use of interactive tools in the theoretical training of athletes in cyclic sports, and it does not meet modern requirements for training athletes. The study aimed to compare the effectiveness of training with the use of traditional and author’s interactive tools of theoretical training of beginner athletes in cyclic sports. Material and methods. In this work, the following research methods were used: theoretical analysis and generalization of literary sources, pedagogical observation, pedagogical experiment, pedagogical testing, methods of mathematical statistics. The study included 36 people involved in kayaking and canoeing at the stage of initial training. The sports experience of the subjects was 1-2 years, qualification at the level of III sports categories. Classes on the developed programs were conducted in the preparatory period of the macrocycle. Results. Training, in which only the theoretical training tools recommended by the curriculum were used, proved to be ineffective in most sections of knowledge at the stage of initial training of athletes. Training sessions with the use of interactive tools proved to be more effective than classes that used only the theoretical training tools recommended by the curriculum. Conclusions. Classes with the use of interactive theoretical training tools contributed more to the increase of the general level of theoretical training of young rowers at the stage of initial training - up to 57,4 % (p < 0.05) than classes using only theoretical training tools recommended by the curriculum. - up to 40,8 % (p < 0.05). Prospects for further research in this direction include the development and experimental testing of the author’s interactive tools for theoretical training, which will increase the level of theoretical training of athletes at different stages of training in cyclical sports.

Evaluation of experimental testing methods for the design of permeable friction course mixtures

2019 ◽  
Vol 206 ◽  
pp. 385-396 ◽  
Author(s):  
Yongchang Wu ◽  
Huaxin Chen ◽  
Qinwu Xu ◽  
Zhen Zhang ◽  
Fangfang Jiao
Keyword(s):  
Experimental Testing ◽  
Testing Methods

Application de la méthode de Bishop simplifiée aux remblais renforcés par les géosynthétiques

1993 ◽  
Vol 30 (5) ◽  
pp. 812-820 ◽  
Author(s):  
Abdelkader Houam ◽  
Jean Nuyens
Keyword(s):  
Tensile Strength ◽  
Stability Analysis ◽  
Key Words ◽  
Safety Factor ◽  
Slip Surface ◽  
New Approach ◽  
Analysis And Design ◽  
Reinforced Slopes ◽  
Bishop’S Method ◽  
Slope Safety

A new approach to stability analysis and design of geosynthetic reinforced slopes based on Bishop's method is presented. The effect of sheet inclination across the slip surface on the safety factor or on tensile strength of the sheet is materialized by the introduction, in the computation, of a factor varying from 0 to 1. The reason for this move is to take the flexibility of the sheet into account. Two tables of procedure were made up in case of analysis and design. Some examples are presented by way of illustrations. Key words : slope, safety, slip surface, slice, geosynthetics.

Application of Slope Safety Automatic Monitoring Technology in the Project of Road No.1 in Republic of Congo

2012 ◽  
Vol 256-259 ◽  
pp. 1429-1433
Author(s):  
Pan Yang ◽  
Shu Dong Zhang ◽  
Jun Mei Guo ◽  
Cheng Xuan Ma ◽  
You Cheng Shen ◽  
...  
Keyword(s):  
Real Time ◽  
Slip Surface ◽  
Automatic Monitoring ◽  
Displacement Monitoring ◽  
Republic Of Congo ◽  
Local Climate ◽  
Wireless Data Transmission ◽  
Surface Prediction ◽  
Slope Displacement ◽  
Slope Safety

Slope safety has been well concerned by the society in recent years. Slope displacement monitoring is an important subject of slope safety and its research has been developing rapidly. In this article, we draw up a pilot slope safety automatic monitoring scheme for the project of Road No.1 in Republic of Congo, which depends on real-time displacement monitoring. This scheme uses fixed inclinometer as its main appliance and achieves wireless data transmission. During this process, we considered both local climate and the characteristics of high slopes along the road, and finished a series of work including monitoring position selection, critical slip surface prediction and finally monitoring system establishment. Our ultimate objective is to achieve real-time monitoring of slope situation, and furthermore set up the relationship among slope displacement, rainfall and time. With the derived relationship we would be able to forecast the development of slope deformation and possible danger caused by the slopes.

scholarly journals Drying Stress and Strain of Wood: A Review

2021 ◽  
Vol 11 (11) ◽  
pp. 5023
Author(s):  
Qin Yin ◽  
Hong-Hai Liu
Keyword(s):  
Near Infrared ◽  
Experimental Testing ◽  
Stress And Strain ◽  
Strain Development ◽  
Testing Methods ◽  
Wood Drying ◽  
Stress Changes ◽  
Reasonable Prediction ◽  
Analysis System ◽  
Cell Wall Mechanics

Wood drying stress causes various drying defects, which result from the wood microstructure and the transfer of heat and mass during the drying. It is the fundamental way to solve the problem of defects to clarify the law and mechanism of wood stress and strain development during drying. In this paper, based on the defects of wood drying, the theory and experimental testing methods of drying stress and strain were summarized. Meanwhile, artificial neural networks (ANN) and their application in the wood drying field were also investigated. The traditional prong and slicing methods were used practically in the research and industry of wood drying, but the stress changes in-process cannot be trapped. The technologies of image analysis and near-infrared spectroscopy provide a new opportunity for the detection of drying stress and strain. Hence, future interest should be attached to the combination of the theory of heat and mass transfer and their coupling during drying with the theory of microscopic cell wall mechanics and macroscopic drying. A more complete image acquisition and analysis system should be developed to realize the real-time monitoring of drying strain and cracking, practically. A more feasible and reasonable prediction model of wood drying stress and strain should be established to achieve the accuracy of the prediction.

Limit equilibrium slope stability analysis using the nonlinear strength failure criterion

2015 ◽  
Vol 52 (5) ◽  
pp. 563-576 ◽  
Author(s):  
Dong-ping Deng ◽  
Lian-heng Zhao ◽  
Liang Li
Keyword(s):  
Stability Analysis ◽  
Slope Stability ◽  
Safety Factor ◽  
Failure Criterion ◽  
Slip Surface ◽  
Limit Equilibrium ◽  
Current Method ◽  
Slope Stability Analysis ◽  
Strength Failure ◽  
Slope Safety

The limit equilibrium stability analysis of two- and three-dimensional slopes with the nonlinear failure strength criterion uses a number of variables to determine the normal and shear stress on the slip surface. The equation for the nonlinear strength failure criterion is expressed using a Taylor series after analyzing the stress of an elemental slice or column. Multivariate linear equations are then derived to determine these variables based on the force and moment equilibrium conditions the sliding body is subject to. The stress on the slip surface can also be obtained to calculate the slope safety factor. The validity of the current method was verified by comparing it with established examples. Charts were produced for slope stability analysis with the nonlinear strength failure criterion under general conditions using the current method. The results of this study show that the slope safety factor decreases with an increase in the geotechnical material parameter m in the nonlinear strength failure criterion. The results of the current method are in close correspondence with other traditional limit equilibrium methods and are more reliable than the Swedish method. The charts can be used to determine slope design parameters that meet specific requirements.

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