Design of reinforced fill systems over voids

1995 ◽  
Vol 32 (6) ◽  
pp. 939-945 ◽  
Author(s):  
Sherif W. Agaiby ◽  
Colin J.F.P. Jones
Keyword(s):  
Life Span ◽  
Key Words ◽  
Limit Equilibrium ◽  
Geosynthetic Reinforcement ◽  
Continuum Analysis ◽  
Limit Equilibrium Methods ◽  
Design Charts ◽  
Insight Into

Embankment fill structures are often laid on formations that may develop cavities during their life-span. The use of geosynthetic reinforcement to mitigate the consequences of the formation of such cavities provides an appealing solution to the problem. To properly analyse the problem of reinforced fill overlying cavities, the reinforcement–fill interaction has to be properly addressed and modelled for a realistic solution to be reached. Typically, this problem has been approached by researchers using limit-equilibrium methods. Limited continuum analyses results are available for the problem. This paper presents the results of a systematic parametric continuum analysis that was carried out to study this problem. The parameters that govern the behaviour of reinforced fill systems were identified and varied within their typical ranges. The objective of the study is to provide a comprehensive set of design charts that give insight into the behaviour of reinforced fill systems and highlight the effect of each of the parameters that govern this behaviour. The charts are presented in simple formats that aid the engineer to estimate the expected settlements, reinforcement tension, and width of affected zone for different conditions, as well as obtain a feel for the interaction taking place between the various elements of the system. Key words : reinforced fill, tension membranes, geosynthetics, coral formations, karstic formations, sinkholes.

ДЕЯТЕЛЬНОСТНЫЙ ПОДХОД В ОБРАЗОВАНИИ В СОВРЕМЕННЫХ УСЛОВИЯХ

2020 ◽  
pp. 122-124
Author(s):  
Зиля Ахмерова
Keyword(s):  
Key Words ◽  
Personality Development ◽  
Modern Education ◽  
Collective Activity ◽  
Training Technique ◽  
Individualized Training ◽  
Insight Into ◽  
Personality Studies ◽  
Activity Organization

Аннотация. Деятельностный подход к организации учебных занятий при профессиональной подготовке специалистов представляет технологию индивидуализированного обучения. В данной статье проведен экскурс по проблеме деятельности. Деятельность рассматривается как способ участия индивида в преобразовании существующей действительности, как метод познания, как условие проявления и развития личности, как условие конструирования отношений между людьми. Функции деятельности непосредственно связаны не только с проектной деятельностью, но и с развитием личности. Поэтому деятельностная организация процесса проектирования как метода развития личности является актуальной. Кроме этого отмечается, что роль преподавателя в ходе осуществления личностно-деятельностного подхода заключается в умелой организации образовательно- профессиональной среды. Ключевые слова: деятельность, личность, учебная деятельность, проектная деятельность, личностно-деятельностные технологии. Аннотация. Адистерди кесиптик даярдоо учурунда окуу сабактарын уюштуруунун ишмердик ыкмасы жеке инсанга багытталган окутуу технологиясы болуп эсептелет. Бул макалада ишмердик маселеси боюнча экскурс жүргүзүлгөн. Ишмердүүлүк учурдагы чындыкты кайра өзгөртүп түзүүдөгү индивиддин катышуу жолу катары, таануу методу катары, инсандын өзүн көрсөтүүсүнүн жана өнүгүүсүнүн шарты катары, адамдар ортосунда мамиле түзүү ыкмасы катары каралат. Ишмердүүлүктүн функциялары долбоордук иштер менен гана эмес, инсандын өнүгүүсү менен да түздөн-түз байланыштуу. Ошондуктан инсанды өнүктүрүүнүн ыкмасы катары долбоорлоо процессинин ишмердик уюштурулушу актуалдуу. Мындан тышкары, жеке инсанга багытталган – ишмердик ыкмасын ишке ашыруудагы окутуучунун ролу билим берүүчүлүк-кесиптик чөйрөнү эптүү уюштуруу экендиги белгиленет. Түйүндүү сөздөр: ишмердүүлүк, инсан, окуу иши, долбоордук иш, жеке инсанга багытталган – ишмердик технологиялар. Annotation. The activity approach to organization of study in the profession- al training of specialists represents the individualized training technique. This article makes the insight into the activity issue. The activity is considered as a way of person’s participation in transformation of existing reality, as a way of learning, as a condition for personality demonstration and development, as a condition for building relations be- tween people. The functions of the activity are immediately associated with not only de- signing activity but with development of the personality. That is why activity organization of the designing process as a way of personality development is relevant. However, in the modern education, the personal and activity approach is to be com- bined with other approaches of the collective activity based on self-government and competitiveness. Key words: activity, personality, studies, designing activity, personal and activity techniques

Numerical Simulation Method Ascertaining Slope Stabilization Anti-Slippery Pile's Basic Parameters

2012 ◽  
Vol 594-597 ◽  
pp. 222-225
Author(s):  
Wen Juan Feng ◽  
Xiao Dong Ju ◽  
Zheng Sheng Zou
Keyword(s):  
Numerical Simulation ◽  
Safety Factor ◽  
Limit Equilibrium ◽  
Simulation Method ◽  
Simulation Software ◽  
Strength Reduction ◽  
Slope Stabilization ◽  
Limit Equilibrium Methods ◽  
Basic Parameters ◽  
Shear Strength Reduction

Although anti-slide pile take a key position in slope-treating measures, the method of designing is far from perfect. The methods used in actual projects are based on the rigid body limit equilibrium methods. There is a tendency to using numerical methods in the progress of pile-designing. The safety factor of landslide is calculated according to shear strength reduction theory in the numerical simulation software. Using the shearing forces on pile and the safety factor can ascertain the position of anti-slide piles, the area and distance of piles. For numerical simulation can well perform the simulation slope moving and the load on piles and can give a more reasonable designing.

Some difficulties associated with the limit equilibrium method of slices

1983 ◽  
Vol 20 (4) ◽  
pp. 661-672 ◽  
Author(s):  
R. K. H. Ching ◽  
D. G. Fredlund
Keyword(s):  
Slope Stability ◽  
Factor Of Safety ◽  
Limit Equilibrium ◽  
Stability Limit ◽  
Limit Equilibrium Method ◽  
Soil Conditions ◽  
Side Force ◽  
Limit Equilibrium Methods ◽  
Equilibrium Method ◽  
The Stability

Several commonly encountered problems associated with the limit equilibrium methods of slices are discussed. These problems are primarily related to the assumptions used to render the inherently indeterminate analysis determinate. When these problems occur in the stability computations, unreasonable solutions are often obtained. It appears that problems occur mainly in situations where the assumption to render the analysis determinate seriously departs from realistic soil conditions. These problems should not, in general, discourage the use of the method of slices. Example problems are presented to illustrate these difficulties and suggestions are proposed to resolve these problems. Keywords: slope stability, limit equilibrium, method of slices, factor of safety, side force function.

scholarly journals Experimental and Numerical Investigation on the Stability of Loess Embankment Treated by Chemical Solution under Freezing-Thawing Conditions

2021 ◽  
Author(s):  
Hua Liu ◽  
Zelin Niu ◽  
Yuanhong Dong ◽  
Naifei Liu ◽  
Shuocheng Zhang
Keyword(s):  
Shear Strength ◽  
Safety Factor ◽  
Limit Equilibrium ◽  
Solution Concentration ◽  
Chemical Solution ◽  
Compression Index ◽  
Limit Equilibrium Methods ◽  
Novel Method ◽  
The Stability ◽  
Embankment Stability

Abstract In order to study the influence of chemical solution on the stability of loess embankment in seasonally frozen regions, the compression index, shear strength index and embankment safety factor of compacted loess fillings that were treated by different concentrations of chemical solution were analyzed through laboratory test and slope stability analysis program. The experimental results showed that the collapsible coefficients of remolded loess treated by different chemical solution will all increase which comparing the distilled water, and then will change again after freezing-thawing cycles (FTCs). The compression index of undisturbed loess will show regularity with the increase of chemical solution concentration. The shear strength of remolded loess also changed under the chemical solution and FTCs. Besides, simulation of the strength parameters by limit equilibrium methods showed that the safety factor of loess embankment with treatment of solution was significantly higher than that of untreated one, and the FTC would cause a further deterioration. The embankment stability improved after treated by chemical solution without considering seepage of rainwater. These results would provide a novel method to the problem of embankment stability related to environmental condition changes.

scholarly journals Fathers on Leave: Experiences of Middle-Class Fathers on Parental Leave in the City of Zagreb

2021 ◽  
Vol 28 (3) ◽  
pp. 391-413
Author(s):  
Mirna Varga
Keyword(s):  
Middle Class ◽  
Key Words ◽  
Parental Leave ◽  
Work And Family ◽  
Sudden Increase ◽  
Initial Decision ◽  
Leave Policy ◽  
The City ◽  
Insight Into

Parental leave reforms that aimed at higher father’s involvement in childcare began in the 1970s. However, the number of fathers who took parental leave increased only in the 1990s when Scandinavian countries began introducing father’s quotas or paternity leaves, that is, earmarked leave periods to be used by fathers or otherwise lost. Croatia introduced the two-month father’s quota as late as in 2013. Although the reform did not contribute to a sudden increase in the number of fathers on parental leave, there is always a steady, albeit small, number of fathers taking up leave. This article aims to provide an insight into fathers’ experiences on parental leave in Croatia. Relying on interviews with 11 middle-class fathers in the City of Zagreb, the article explores father’s motives for taking leave, their experience regarding the initial decision and the procedure of exercising their right to leave and their experience of being on leave. Results suggest that the fathers were very eager to use their right to leave and spend time with their children. They mostly used longer leaves (more than 3 months) and the experience of being home alone with the child made the fathers learn new skills in relation to childcare and housework, but also rethink their relation to work and family. Key words: parental leave policy, parental leave, father’s quotas, fathers’ experiences, Croatia

scholarly journals SARS-CoV-2: An Ophthalmological Insight into the Pandemic; Challenges and Management Strategies

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Jaya Kaushik ◽  
◽  
Sandeep Shankar ◽  
Anargh V ◽  
Renu M ◽  
...  
Keyword(s):  
Key Words ◽  
Management Strategy ◽  
Management Strategies ◽  
Evidence Based ◽  
Effective Management ◽  
Protective Measures ◽  
Insight Into

Objective: To formulate a protocol for safe and effective management of an ophthalmologic practice in a hospital or a clinic during the Covid - 19 pandemic. Methods and analysis: Literature was reviewed regarding Covid-19 pandemic and ophthalmology. The following key words were used. Covid-19, telemedicine, challenges, management strategy. Result: An efficient protocol for ophthalmology practice during the Covid-19 pandemic was established which covered various protective measures that are essential and vital in the Covid-19 pandemic. Conclusion: An evidence-based protocol was formulated which may be modified in future as per the latest developments and trends in the ongoing pandemic.

Factor of safety of slope stability from deformation energy

2018 ◽  
Vol 55 (2) ◽  
pp. 296-302 ◽  
Author(s):  
Shiguo Xiao ◽  
Wei Dong Guo ◽  
Jinxiu Zeng
Keyword(s):  
Shear Strength ◽  
Factor Of Safety ◽  
Plastic Material ◽  
Limit Equilibrium ◽  
Deformation Energy ◽  
Simple Expression ◽  
Shear Stresses ◽  
Limit Equilibrium Methods ◽  
Coulomb Failure Criterion ◽  
Elastic Plastic Material

The factor of safety of a slope (Fs) is invariably assessed using methods underpinned by moment, force, and (or) shear strength equilibrium concerning slip surfaces. Each method inherently embeds some form of limitations, despite being popularly adopted in practice. In this paper, a new Fs is devised using the ratio of ultimate energy (eu, upon sliding) over accumulated “elastic” energy. The Fs is then reduced to a simple expression of the power to shear stress and shear strength, by taking soil as an elastic–plastic material obeying the Mohr–Coulomb failure criterion. This expression empowers significant efficacy in gaining the factor of safety (without involving energy or directions of shear stresses). The Fs values were calculated for three typical slopes concerning various mechanical properties (dilation, Poisson’s ratio, and shear modulus) and effective computational strategies. All of the Fs values (to a congruous accuracy of available methods) were obtained in less than 1% the time of conventional numerical analyses. The proposed Fs, equally applicable to limit equilibrium methods, may be utilized in practice to expedite slope design.

scholarly journals Factor of Safety Reduction Factors for Accounting for Progressive Failure for Earthen Levees with Underlying Thin Layers of Sensitive Soils

2013 ◽  
Vol 2013 ◽  
pp. 1-13 ◽  
Author(s):  
Adam J. Lobbestael ◽  
Adda Athanasopoulos-Zekkos ◽  
Josh Colley
Keyword(s):  
Finite Element ◽  
Strain Softening ◽  
Progressive Failure ◽  
Limit Equilibrium ◽  
Thin Layers ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Limit Equilibrium Methods ◽  
The Stability ◽  
Reduction Factors

The effects of progressive failure on flood embankments with underlying thin layers of soft, sensitive soils are investigated. Finite element analysis allows for investigation of strain-softening effects and progressive failure in soft and sensitive soils. However, limit equilibrium methods for slope stability analysis, widely used in industry, cannot capture these effects and may result in unconservative factors of safety. A parametric analysis was conducted to investigate the effect of thin layers of soft sensitive soils on the stability of flood embankments. A flood embankment was modeled using both the limit equilibrium method and the finite element method. The foundation profile was altered to determine the extent to which varying soft and sensitive soils affected the stability of the embankment, with respect to progressive failure. The results from the two methods were compared to determine reduction factors that can be applied towards factors of safety computed using limit equilibrium methods, in order to capture progressive failure.

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