Wyniki wyszukiwania - BazTech

1

Identyfikacja parametrów geotechnicznych lessów lubelskich na podstawie sondowań statycznych CPT

Nepelski K., Rudko M.

Przegląd Naukowy Inżynieria i Kształtowanie Środowiska

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2018

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Vol. 27, No. 2

186--198

PL

W pracy przedstawiono analizę wyników badań wykonanych na gruntach lessowych Lubelszczyzny, klasyfikowanych geotechnicznie według norm PN-86/B-02480:1986 oraz PN-EN ISO 14688-1:2006 jako pyły i pyły piaszczyste oraz piaski pylaste. W terenie wykonano ponad 300 sondowań CPT/CPTU z elektrycznym i mechanicznym stożkiem, badając łącznie około 2700 mb profilu lessowego. W kilkunastu miejscach przeprowadzono testy porównawcze oporów sondowania uzyskanych różnymi stożkami. W wybranych miejscach bezpośrednio przy sondowaniach wykonywano odwierty i pobierano próbki do badań laboratoryjnych. W laboratorium określano wilgotność naturalną i granice konsystencji. Dodatkowo przeanalizowano parametry wytrzymałościowe (kąt tarcia wewnętrznego i spójność) oraz odkształceniowe (moduły ściśliwości). Otrzymane wyniki porównano z danymi literaturowymi oraz rezultatami badań wykonywanych dla celów projektowych.

EN

The paper presents an analysis of the results of tests carried out on loess subsoil in the Lublin region, classifi ed geotechnically according to PN-86/B-02480:1986 and PN-EN ISO 14688-1:2006 as silt, sandy silt and silty sands. In the field, over 300 CPT/CPTU with electric and mechanical cones tests were performed, testing a total of about 2,700 lm of the loess profile. In several places, comparative tests of the probing resistances obtained with different cones were carried out. In selected places, holes were drilled directly at the penetrometer tests and samples were taken for the laboratory tests. Moisture, consistency limits were determined in the laboratory. In addition, the strength parameters (angle of internal friction and cohesion) and deformation parameters (oedometer modules) were analyzed. The obtained results were also compared with the literature data and the results of tests carried out commercially for design purposes.

2

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.

3

A Study on the Pull-out Resistance of Dynamically Driven Nails and the Cavity Expansion Method

Sawicki A.

Archives of Hydro-Engineering and Environmental Mechanics

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2010

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Vol. 57, nr 3-4

243-260

EN

The problem is how to assess normal stresses around dynamically driven nails. Pull-out tests show that these stresses are much higher than it would follow from classical analyses. Therefore, an analysis of the cavity expansion method was applied to study this problem. It was shown that the cavity expansion method, widely applied in soil mechanics, suffers from many shortcomings. It was also shown that this method is not closely related to cone penetration tests, nor to the technology of dynamic soil nailing.