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1

Determination of mechanical properties of soils based on CPTU data

Chmielewska Iwona

Architecture Civil Engineering Environment

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2023

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Vol. 16, no. 3

55--64

EN

The study aimed to interpret the results of cone penetration tests with pore pressure measurement (CPTU). Tests were performed on a section of the designed road about 200 m long. The subsoil under consideration was characterized by organic soils deposited to a depth of approximately 8 m. Due to the problematic soil and water conditions, improvement with geosynthetic encased columns (GEC) was performed. According to the Recommendations for Design and Analysis of Earth Structures using Geosynthetic Reinforcements – EBGEO, the constrained modulus Eoed and effective friction angle φ’ of soil below the GEC column base should be higher than 5 MPa (Eoed > 5 MPa) and 30° (φ’ > 30°), respectively. In this study, the Eoed and φ’ parameters were determined based on CPTU tests conducted in 12 locations. Analysis of the CPTU data showed that the constrained modulus and effective friction angle of the soil deposited below the GEC column base did not meet EBGEO requirements in most locations. It was also concluded that the minimum value of the constrained modulus required by EBGEO is too low compared with the requested value of the effective friction angle.

2

Testing of innovative foundations of 400 kV OHL transmission towers

Labocha Sławomir, Paluszyński Jarosław

Budownictwo o Zoptymalizowanym Potencjale Energetycznym

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2022

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Vol. 11

31--40

EN

The work describes structural solutions and tests of geotechnical capacity of innovative monolithic-prefabricated foundations. The investigated foundations were shaped as sloped footing pad foundations intended for the foundation of lattice steel 400 kV OHL transmis-sion towers. Full scale geotechnical field tests according to standard PN-EN 61773:2000 were conducted. The test results were compared with those obtained by the FEM method using advanced nonlinear analysis with Hardening Soil Small (HSS) models.

3

Taxonomy of non-destructive field tests of bridge materials and structures

Bien Jan, Kaminski Tomasz, Kuzawa Mieszko

Archives of Civil and Mechanical Engineering

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2019

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Vol. 19, no. 4

1353--1367

EN

Bridges generally are susceptible to deterioration, thus in such a situation precise informa-tion on characteristics and condition of their materials and structural systems based on results of diagnostic procedures is crucial for safety of the structures and users of the transportation infrastructure and also for efficient management of bridge asset. The main purpose of this work is to propose an approach to integrated classification of contemporary non-destructive field tests as a part of general strategy of diagnostic investigations of bridge materials and structures. Analysis of the most frequent degradation stimulators and mechanisms as well as main classes of bridge defects form a background for presented classification of diagnostic tests. The classification includes load-independent and load-dependent testing strategies and takes into account type of tested material and diagnostic goals: geometry identification, assessment of materials characteristics and quality, detec- tion of defects and degradation processes as well as monitoring of bridge structure response to loads and environmental influences.

4

Badania eksploatacyjne systemów podwieszeń sieci jezdnej ze stopów aluminium

Rojek A., Stolarski M., Bartoszek-Majewska D., Błędowski L.

TTS Technika Transportu Szynowego

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2018

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R. 25, nr 10

31--34

PL

Od początku elektryfikacji linii kolejowych w Polsce stosowany był stalowy osprzęt do podwieszenia sieci jezdnej. W ostatnich latach producenci tego typu elementów zaoferowali osprzęt wykonany na bazie stopów aluminium. W celu potwierdzenia jego przydatności do zastosowania na liniach kolejowych zarządzanych przez PKP PLK S.A. przeprowadzono proces dopuszczenia tego osprzętu do stosowania. Jednym z etapów tego procesu są badania eksploatacyjne, którym poświęcony jest niniejszy artykuł.

EN

From the beginning of the electrification of railway lines in Poland, steel accessories were used to suspend the overhead contact line. In recent years, producers of this type of elements have offered equipment made on the basis of aluminum alloys. In order to confirm its suitability for use on railway lines managed by PKP PLK S.A. the process of allowing this equipment to be used has been carried out. One of the stages of this process are field tests, which this article is devoted to.

5

Some experiments in-situ and in laboratory to determine the physico-mechanical properties of coal

Shahriar K., Bakhtavar E., Moeinizadeh A.

Gospodarka Surowcami Mineralnymi

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2009

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T. 25, z. 3

79-96

EN

A number of simple field and laboratory studies and tests were carried out to visualize the nature and variation extent of mechanical properties with emphasis on cuttability across C1 coal seam in Parvade1 mine of Tabas located in east of Iran. Selection of the suitable coal winning machines and of the most effective and fitness bits for it and their arrangement on cutter head have a special relation to reach maximum productivity with minimum energy consumption. The effect of physico-mechanical properties on cuttability were studied in the laboratory and field for the C1 coal seam to identify the relevant parameters affecting the specific energy of coal cuttability. Field studies were also in-situ cuttability along with conducted over a number of active mechanized coal faces to study the geo-mining conditions of the site. The field and the laboratory data of coal cuttability was estimated due to the achieved results of uni-axial, shear, and tensile strength tests, as well as, Impact strength index, expanding bolt, and M.R.E. penetration tests on C1 coal seam.

PL

Przeprowadzono szereg prostych badań i prób polowych oraz laboratoryjnych testów dla określenia mechanicznych właściwości, a w szczególności urabialności pokładu C1 węgla w kopalni Parvade1 w miejscowości Tabas w południowym Iranie. Wybór odpowiednich maszyn urabiających oraz najbardziej efektywnych noży na głowicy urabiającej ma szczególne znaczenie dla uzyskania maksymalnej wydajności przy minimalizacji zużycia energii. Wpływ właściwości fizykomechanicznych na urabialność został zbadany w laboratorium i testach polowych w pokładzie C1 węgla, dla określenia jakie parametry wpływają na jednostkowe zużycie energii w trakcie urabiania. Badania polowe obejmowały testy urabialności in-situ prowadzone w szeregu działających przodkach zmechanizowanych i dotyczyły badania warunków geologiczno-górniczych w kopalni. Dane dotyczące urabialności otrzymano dzięki wykorzystaniu wyników testów wytrzymałościowych jednoosiowego ściskania, ścinania i rozciągania, jak również wykonanych bezpośrednio na pokładzie węgla C1: testu wytrzymałościowego (ISI), kotwii rozprężnej oraz testu penetracyjnego (MRE).

6

Comparison of rollers after sowing of buckwheat

Mursec B., Janzekovic M., Cus F., Zuperl U.

Journal of Achievements in Materials and Manufacturing Engineering

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2006

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Vol. 17, nr 1-2

269--272

EN

Purpose: This paper compares the effect of three types of rollers (rubber, edged and smooth) upon sprouting of three sorts of buckwheat seed (‘Darja’, ‘Bamby’ and ‘Gorenjka’). Rolling is a very important soil cultivation measure after sowing of small seed such as the buckwheat seed, particularly, during the time of drought when the test was performed. Design/methodology/approach: A field test was carried out on divided lots of land in a random block. Sowing and rolling were performed on 6 June 2003. During that period there was an extreme drought causing lack of humidity in the ground. The plants were counted on the 10 and 12 July, i.e., on the fourth and sixth day after sowing. There were most sprouting plants in case of rubber rollers, followed by smooth and edged rollers. Findings: The least plants sprouted on the non-rolled lots of land. The sort had a statistically characteristic effect on the share of plants sprouting during the fourth and sixth day after sowing. Research limitations/implications: The research was carried out only with three types of rollers and three sorts of buckwheat seed. Practical implications: The sort ‘Gorenjka’ had most sprouting plants, followed by the sort ‘Bamby’ and the sort ‘Darja’ with least sprouting plants. Originality/value: In our researches it was proved that the most favourable combination is the rubber roller and the sort ‘Gorenjka’.