Independence of geostatic stress from overconsolidation in some Beaufort Sea clays

1987 ◽  
Vol 24 (3) ◽  
pp. 342-356 ◽  
Author(s):  
M. G. Jefferies ◽  
J. H. A. Crooks ◽  
D. E. Becker ◽  
P. R. Hill
Keyword(s):  
Key Words ◽  
Stress Ratio ◽  
Beaufort Sea ◽  
The Self ◽  
Geologic History ◽  
Overconsolidation Ratio ◽  
Site Investigations

Since 1982, extensive use has been made of the self-bored pressuremeter in Arctic offshore site investigations. One finding of this work is that the in situ geostatic stress ratio K0 of Beaufort Sea clays is apparently unrelated to the overconsolidation ratio (OCR). The procedures and data to support this finding are documented and the finding is discussed in light of the present geological understanding for the area. It is concluded that the independence of K0 from OCR may be quite widespread, a finding that contradicts the widely held tenet regarding the existence of a single-valued function relating K0, [Formula: see text], and OCR. If K0 is regarded as important, then it should be measured in situ. Key words: self-bored pressuremeter, geostatic stress ratio (K0), Beaufort Shelf, geologic history, overconsolidation ratio.

Determination of horizontal geostatic stress in clay with self-bored pressuremeter

1988 ◽  
Vol 25 (3) ◽  
pp. 559-573 ◽  
Author(s):  
M. G. Jefferies
Keyword(s):  
Key Words ◽  
Image Matching ◽  
The Self ◽  
In Situ Tests ◽  
Extended Theory ◽  
Computer Aided ◽  
Modelling Procedure

The Gibson–Anderson theory for interpretation of pressuremeter data in clay is extended to include the unloading part of the test for the particular circumstances that prevail with a self-bored pressuremeter (SBP). Incorporation of the extended theory in a computer-aided modelling procedure allows horizontal geostatic stress to be unambiguously determined from SBP data by image matching irrespective of imperfections in the self-boring process. The procedure is illustrated by example on a previously reported test carried out in Beaufort Shelf clay. Key words: clay, in situ tests, self-bored pressuremeter, K0.

scholarly journals Analysis of yield stress ratio and overconsolidation ratio as parameter determination preconsolidation in eemian gyttja

2018 ◽  
Vol 50 (2) ◽  
pp. 109-118
Author(s):  
Edyta E. Malinowska ◽  
Marek Bajda
Keyword(s):  
Yield Stress ◽  
Laboratory Tests ◽  
Stress Ratio ◽  
Geotechnical Engineering ◽  
Parameter Determination ◽  
Stress History ◽  
Overconsolidation Ratio ◽  
Depositional Processes ◽  
Soil Behaviour

Abstract The preconsolidation stress is an important phenomenon that determines the value of stress history exerted in the past on the subsoil in the geotechnical engineering. Overconsolidation ratio (OCR) is one of the main criteria conditioning soil behaviour and its characteristics. Here thought, the yield stress ratio (YSR) is used to determine the value of preconsolidation stress resulting from mechanical overburden than can be changed by many post depositional processes like secondary and tertiary compressibility, cementation, aging, temperature change and others. The yield stress ratio (YSR) is defined as the relationship between vertical yield stress (σ’vy) to the effective vertical stress (σ’v0). The eemian gyttja was used as a foundation in the engineering construction. In practical geotechnical engineering, evaluation of stress history is usually based on the overconsolidation ratio (OCR). The yield stress ratio (YSR) was used in the laboratory as one of the basic parameters for the geotechnical design of the structure. To know the relation between geological background, history and mechanical behaviour in long-time process of the soil aims a knowledge that can help engineers who often have to predict soil behaviour based upon the soil geological history and a few geotechnical data. In order to evaluate the yield stress ratio of eemian gyttja it is necessary to restore this soft, organic soil as much as possible to the in situ conditions. The laboratory tests were used to determinate the vertical yield stress and then the yield stress ratio. The laboratory tests were made in the automatic oedometer and the in situ tests were carried out on the dilatometer test (DMT). The comparison between the determination the yield stress ratio of eemian gyttja from the laboratory and the overconsolidation ratio from in situ test has been done. The studies have shown that the values of the overconsolidation ratio determinate from the laboratory tests are a little higher than determinate from the in situ tests.

Efficiency of diagnosis and treatment non-invasive and microinvasive sgamous cell cervical cancer

2020 ◽  
pp. 71-74
Author(s):  
M.M. Melnyk ◽  
◽  
S.V. Nespradko ◽  
I.V. Goncharuk ◽  
M.V. Marchenko ◽  
...  
Keyword(s):  
Cervical Cancer ◽  
Key Words ◽  
National Cancer Institute ◽  
Reproductive Function ◽  
Diagnosis And Treatment ◽  
Non Invasive ◽  
Corpus Uteri ◽  
Complex Program ◽  
Early Cervical Cancer

The objective: analyse the effectiveness of diagnosis and treatment for early cervical cancer. Materials and methods. Analysed 107 cases of women’s disease on CIN ІІІ, cancer in situ, they were on treatment in National cancer institute and Kyiv dictrict cancer dispensary from 2010 till 2015 years. Results. Diagnosed percent relapse CIN ІІІ, cancer in situ contain 4.57% uninvasive and invasive form – 0.94%. Conclusion. According diagnostic CIN ІІ and CIN ІІІ is recommended to do treatment conization and dynamic dispensary observation. Are making complex program of infection HPV16, 18. In appering of margins resection some elements of tumor after wider conization by forms of cancer in situ. Many of expansive burns in cervical glands, in making of reproductive function, going disease (nodel leiomyoma of corpus uteri etc). In perspective is accept the notion of looking after and screening research of considering infection HPV16, 18 on CIN І, CIN ІІ. Key words: cervical cancer, сancer in situ, CIN І–ІІІ, diagnostic, treatment, conization.

In situ estimation of the coefficient of consolidation in clays

1990 ◽  
Vol 27 (1) ◽  
pp. 58-67 ◽  
Author(s):  
Mohammed G. Kabir ◽  
Alan J. Lutenegger
Keyword(s):  
Key Words ◽  
Pore Pressure ◽  
Reference Values ◽  
Time Factors ◽  
In Situ Tests ◽  
Coefficient Of Consolidation ◽  
Oedometer Test ◽  
Undisturbed Samples ◽  
Oedometer Tests

An investigation was conducted to demonstrate the applicability of cylindrical piezocone and flat piezoblade tests for providing reliable estimates of the coefficient of consolidation in clays. Coefficients of consolidation were calculated from piezocone dissipation tests for different degrees of consolidation using theoretical time factors to provide a comparison with laboratory oedometer tests. Three techniques were developed to calculate the coefficient of consolidation from piezoblade dissipation tests. Results from in situ pore pressure dissipation tests were compared with laboratory oedometer tests performed on undisturbed samples oriented in both the vertical and horizontal directions, to provide reference values of cv and ch. The results of investigations conducted at several clay sites are presented. Key words: in situ tests, piezocone, piezoblade, coefficient of consolidation, oedometer test, clays.

An SiOx anode strengthened by the self-catalytic growth of carbon nanotubes

Nanoscale ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 3808-3816
Author(s):  
Hongjin Xue ◽  
Yong Cheng ◽  
Qianqian Gu ◽  
Zhaomin Wang ◽  
Yabin Shen ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Volume Change ◽  
Large Volume ◽  
The Self ◽  
Catalytic Growth ◽  
Large Volume Change

A close-knit CNTs coating that in-situ grown on the SiOx particles realizes the “soft-combination” between SiOx and CNTs, thus conquering the long-lasting issues of poor conductivity and large volume change of SiOx faced.

Analysing the Self-Efficacy Levels of Coaches of Different Branches

2021 ◽  
Vol 15 (7) ◽  
pp. 2206-2209
Author(s):  
Nahit Özdayi
Keyword(s):  
Normal Distribution ◽  
Key Words ◽  
Self Efficacy ◽  
The Self ◽  
The Other ◽  
Professional Experience ◽  
Age Group ◽  
Other Hand

Aim: This paper aims to analyse the self-efficacies of coaches of different branches. Methods: This study, which was conducted by using coach self-efficacy scale, reached totally 192 volunteering coaches who lived in Çanakkale and Balıkesir. The data collected were then analysed on the SPSS programme. The kurtosis and skewness values were examined so as to check the distribution of the data, and consequently, the data were found to have normal distribution. Results: As a result, statistically significant differences were found between the coaches aged 28-32 and coaches aged 33-37 in their levels of self-efficacy in general and in the sub-factor of efficacy in impersonating. Accordingly, the coaches who were in 28-32 age group had higher self-efficacy and efficacy in impersonating than the ones who were in 33-37 age group. On the other hand, there were no statistically significant differences between the participants’ levels of self-efficacy according to gender, branch and professional experience. Conclusion: The coaches in the 28-32 age group were found to have higher self-efficacy and efficacy in impersonating than the coaches in the 33-37 age group on examining the results obtained. No differences were found between the participants in the other factors. Key Words: Self-efficacy, coaches, sport

scholarly journals VERIFICAÇÃO DO DESEMPENHO DAS ESTACAS INJETADAS AUTOPERFURANTES EXECUTADAS EM SOLOS ARENOSOS PARA CONSTRUÇÃO DE USINA EÓLICA

2017 ◽  
Vol 13 (2) ◽  
Author(s):  
Rodrigo Cerqueira Rogerio
Keyword(s):  
Structural Characteristics ◽  
Load Capacity ◽  
The Self ◽  
Executive Processes ◽  
Empirical Methods ◽  
Deep Drilling ◽  
Load Tests ◽  
Different Diameters ◽  
Semi Empirical

RESUMO: Apresenta-se neste trabalho a solução adotada para execução das fundações do Parque de Usina Eólica localizado no Ceará, com a utilização das estacas injetadas autoperfurantes, executadas em presença de solos arenosos. No qual consiste em perfurar o solo com altíssima velocidade por rotação e “pull down”, através da injeção simultânea de nata de cimento com medias pressões. Ocasionando na estaca um diâmetro final que pode obter o dobro do bit de perfuração, de acordo com o tipo de solo, gerado pelo efeito do jato da nata de cimento. Detalhando os processos executivos, verificando os aspectos técnicos e operacionais, para melhor compreender as características estruturais deste elemento. De forma a verificar “in situ” o desempenho deste novo tipo de fundação profunda, foram realizadas provas de carga, em estacas com diferentes diâmetros e comprimentos, realizadas em perfis estratigráficos de solos arenosos, para melhor avaliação de sua capacidade de carga. Analisando-se os ensaios das provas de carga interpretados a base da extrapolação da curva carga versus recalque e das previsões da capacidade de carga, obtidas por meio dos métodos semi-empíricos de correlação com ensaios de penetração (SPT), avaliando os padrões de execução desta tipologia de estaca injetada para comunidade geotécnica. ABSTRACT: This paper aims to establish the selected solution to except the foundations of the Wind Energy Park in Ceará (Brazil), with an executive methodology of the self-drilling injection piles framed in loco in Sandy soil. In which the soil drilling is done with the highest speed by rotation and pull down, through the simultaneous injection of grouting with medium pressures. This kind of drilling causes in the pile a final diameter that can get the double bore bit, according to the type of soil, done by the grouting blast. The executive processes are detailed as a whole, and also presenting the pile materials composition, in order to understand the structural characteristics of this element. To verify the performance of this new kind of deep drilling, instrumentations were done: settlement control and load tests in constructions with different structural characteristics, in self-drilling injected piles with different diameters and length, done in stratigraphical sandy, for a better evaluation of its load capacity. Analyzing the essays of load tests interpreted in the basis of curve extrapolation load versus settlement and the previsions of the load capacity, obtained by semi-empirical methods correlating with the penetrations methods (SPT), offering information to the geotechnical community.

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