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Analiza powtarzalności wydzieleń geologiczno-inżynierskich w dolinie rzecznej

Wierzbicki J., Smaga A.

Przegląd Geologiczny

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2014

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Vol. 62, nr 10/2

721--726

EN

The paper presents results of geotechnical and geological investigation on flood plain of the Warta River, below the Jeziorsko reservoir. It is the section of the river, where the intensive erosion process of the river bed occurs. To stop this process thresholds are built. Their efficiency depends of ground conditions, especially spatial variability of geotechnical parameters. To describe the subsoil cone penetration tests were carried out. Subsequently Authors used statistical techniques to analyze variations of geotechnical parameters. Most of all, k-means method was applied. This well known cluster analysis is one of analysis which makes dividing subsoil into relatively homogeneous layers in different part of the river valley possible. However, Authors observed that in case of river alluvial 20% of variation of parameters values in layer is necessary to accept.

2

Piezocone in silty tailing materials.

Schnaid F., Bedin J., Costa Filho L.M.

Studia Geotechnica et Mechanica

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2007

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Vol. 29, nr 1-2

151-162

EN

Countries with large mining industry operations face serious environmental risks resulting from large-scale mining activities. Although there has been a significant improvement in the design and management of tailings storage facilities, there are still major economic and technical constraints that cause important environmental impact in discharge areas. From a technical perspective, investigations of water table configuration, aquifer boundaries, site characterization and determination of short- and long-term properties of tailings materials are important requirements for engineering of tailings. These aspects are evaluated in this paper from the results of piezocone tests, with focus on aspects regarding segregation, shear strength and consolidation properties of gold and alumina mining tailings. Attention is given to identification of essential features that link the rate of cone penetration to drainage effects, which is achieved by expressing the results in a space that correlates a di-mensionless velocity V with the degree of drainage U. In this space, partial drainage is identified and the risk of overestimating properties assessed from field tests is avoided.

3

Experience with CPTU, T-bar and ball penetrometers in two soft clays.

Lunne T.

Studia Geotechnica et Mechanica

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2007

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Vol. 29, nr 1-2

87-101

EN

Field developments in deep waters with very soft soils have led to increased reliance on the use of in situ tests to evaluate soil design parameters. Recently the T-bar and ball penetrometers have been introduced due to their potential for increasing the reliability of interpreted undrained shear strength relative to the CPTU for soft clays. Empirical correlations based on field tests and laboratory tests on samples at two onshore soft clay sites indicate that T-bar correlation factors are in a somewhat narrower range compared to cone factors. Recommendations are given in terms of cone and T-bar factors to use.

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Efficiency of selected statistical criteria in determination of geotechnical parameters from CPTU.

Młynarek Z., Wierzbicki J., Wołyński W.

Studia Geotechnica et Mechanica

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2007

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Vol. 29, nr 1-2

137-149

EN

Determination of homogeneous geotechnical layers is one of the most important tasks in geotechnical designing. To achieve this a number of different statistical methods can be used. In the paper, the results of using a few of these methods have been presented and discussed. The differences between final geotechnical models of subsoil have been highlighted. As the result of analysis carried out, a two-step procedure was proposed for obtaining geotechnical layers, using statistical criteria.

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Determination of the bearing capacity of pile foundations based on CPT test results

Gwizdała K., Stęczniewski M.

Studia Geotechnica et Mechanica

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2007

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Vol. 29, nr 1-2

55-67

EN

The method implementing CPT results in order to determine pile's bearing capacity is presented. In this method, the shaft and base bearing capacities contribute to the determination of whole load-settlement curve making use of respectively chosen load-transfer function. The method has been developed on the basis of filed measurement of piles being applied to loading tests as well as CPT testing in the area of piling. Totally, tests for 94 Vibro and large bored piles installed under differentiated soil conditions were analyzed. The test results have been interpretated statistically by estimating the method parameters and by verification of various statistical hypotheses.