<abstract xmlns="http://www.w3.org/1999/xhtml">

Across the globe, cold region areas experience frequent freeze and thaw cycles. Sometimes these natural cycles become so impacteous that the engineering properties of soil get affected adversely and supported structures like pavements damage or collapse by the time. In the present study chicken eggshell powder, sodium chloride and polypropylene fibres were used to stabilise the soil. Strength properties of 21-day cured virgin and treated soil samples were determined after keeping under 3, 5 and 10 freeze–thaw cycles. For durability assessment, mass loss was also determined after the same number of freeze–thaw cycles. Finally, optimal conditions were determined through analysis of variance. Results showed that the natural additives and synthetic fibres promise as better provision against harsh weather conditions. Design of experiments was made by the Taguchi technique using a statistical software Minitab® 17. Further analysis was done to find out the probability distribution of the responses. Probability distribution showed a large variation in the responses that implies that although the results were found satisfactorily as per the engineering purposes, yet not suitable to make any relationship between strength and durability properties.
</abstract>

Statistical analysis of fibre reinforced frozen soil

<abstract xmlns="http://www.w3.org/1999/xhtml">

The use of nonwoven geotextile filters is common in geoenvironmental and geotechnical engineering applications. The main requirements for successful performance of drainage and geotextile filters are soil retention, permeability and clogging resistance. In case of anti-clogging capabilities, the most popular method to evaluate the filtration behaviour of nonwoven geotextile in contact with soils is gradient ratio test. Also the number of constrictions of nonwoven geotextile should be determined on the basis of fibre diameter, thickness and porosity. The number of constrictions has been found to explain the different filtration behaviours of nonwoven geotextiles with similar or even the same opening sizes but different structures for various soil conditions. This paper presents the gradient ratio test program for internally unstable soil and nonwoven geotextiles with different structures. Test results show a significant impact of the number of constrictions on the filtration characteristics of geotextile. What is more some modifications to the filter design criteria are proposed based on interpretation of the experimental results.
</abstract>

Impact of the Constrictions Number on Filtration Characteristics of Nonwoven Geotextiles

<abstract xmlns="http://www.w3.org/1999/xhtml">

This article shows the results obtained during the implementation of a portable diagnosis system to the maintenance the complex technical objects. As an example, the procedures for testing the behaviour of passenger vehicles and the fixed track of an underground train were proposed, which allowed for the assessment of such aspects as: safety, comfort and technical condition of the track-vehicle junction. The reports given in this evaluation allowed the identification and the arrangement of the track sections according to its technical condition, relating thus the track and vehicle condition parameters to the estimators connected with the passenger vehicles dynamics.
</abstract>

Warsaw University of Life Sciences – SGGW

UTH University of Technology and Commerce

Research Condition of Complex Technical Objects

<abstract xmlns="http://www.w3.org/1999/xhtml">

The research work examined the evaluation of the damage and reinforcement of the foundation in a ten-storey building in Rivers State. The following tests: deep boring test, standard penetration test, boreholes sampling, and crack monitoring by Demec gauge have been carried out to check all kinds of damages related to a strong connection with the ground since the behaviour of the ground determines the stability of the building foundation and the long-term performance of the building. Foundation failures have a major impact on the performance of the building structure. If the base is not stable and moves easily, distortion and deflection will occur. It causes damage to the structure, such as cracks in walls, beams, and floors, and becomes a problem for residents. This problem needs to be fixed and corrective work is the option to fix the error. The following recommendations were considered as follows; maintenance of the building and subsoil to avoid deformation and damage to the building structure at least every six months. Periodic on-site inspection is very important to determine if there is any damage to the building structure. The inspection can be carried out at least once every six months or once a year.
</abstract>

Evaluation of the damage and reinforcement of the foundation in a ten-storey multi-purpose building in Port Harcourt, Rivers State, Nigeria

<abstract xmlns="http://www.w3.org/1999/xhtml">

The object of analysis is a heat conduction problem within the framework of tolerance modelling in fourth-component biperiodic composite. Two materials are isotropic and two are orthotropic, and additionally symmetry axes of orthotropic ones are rotated with respect to each other by an angle equal 90°. The results of some special boundary conditions for stationary problem of heat conduction were obtained from the local homogenization model (LHM). The model equations were derived by simplifying the equations of the standard tolerance model (STM), which were obtained based on two model assumptions: micro-macro decomposition of the temperature field and residual function averaging, after introducing the concept of “weakly slowly varying function” (WSV) and “slowly varying function” (SV) into the modelling process. The presented examples show the influence of the given boundary conditions on the macro-temperature distribution and on the distribution of the approximate temperature field <italic>θ</italic>(·). The effect of thermal conductivity of the component materials and the number of periodicity cells on temperature distribution was also shown.
</abstract>

Water Centre, Warsaw University of Life Sciences – SGGW

Tolerance modelling of heat conduction in biperiodic fourth-component composite

<abstract xmlns="http://www.w3.org/1999/xhtml">

The paper concerns lowering water level in excavations for residential buildings in a dense urban development. The construction and protection of excavation walls as well as the methods of lowering the water level and its impact on the surroundings were discussed. An excavation dewatering system is presented on the example of a multi-family residential building with one underground floor, built in dense urban development. The excavation executed in the sandy subsoil below the groundwater level and encased with walls made of steel sheet piles was analysed. Two concepts of lowering the water level in the excavation were considered: the first with use of a wellpoint system, the second with use of a well with pumps. The conducted calculations showed that when using a wellpoint system to lower the water level in the excavation for analysed multi-family residential building, a system consisting of 260 wellpoints with a spacing of 1.0 m should be made. The efficiency of a single wellpoint is 12.25 m3•d–1, and the efficiency of the entire installation is 3,185.69 m3•d–1. When draining the wells, a system consisting of 9 wells should be made, with a unit capacity of 375.58 m3•d–1 and efficiency of the total installation 3,380.22 m3•d−1.
</abstract>

Lowering water level in an excavation for a multi-family residential building in urban development

<abstract xmlns="http://www.w3.org/1999/xhtml">

Digitisation of spatial planning can be considered multi-dimensionally. The more comprehensive the approach, the better the solutions will be. The idea of a step-by-step approach should bring the best end result. The obligation to create spatial data, which was introduced in Poland, in a way, forced municipalities or urban planners to acquire knowledge and skills in geoinformation and GIS software. The main objective of this article is to present the assumptions and propose a framework and further stages of digitisation of spatial planning in Poland. The specific objective is to present the legislation in the process of digitisation of spatial planning, which has been initiated or significantly modified by the author, and the procedure of which has started or was ongoing in the Department of Spatial Planning within the Ministry of Economic Development and Technology in June 2021. Thus, in addition to the implemented measures, the author also indicates the potential and benefits for urban planners, resulting from the creation of the graphic part of acts in vector form, but also outlines the importance of such studies for various groups of recipients and public administration. At the same time, the people for whom any solution is created – the general public – should not be forgotten.
</abstract>

Selected aspects of the digitisation of spatial planning in the context of legislative changes in Poland

<abstract xmlns="http://www.w3.org/1999/xhtml">

Geodetic monitoring of deformation has an important role in ensuring the safety of geotechnical objects by monitoring of not exceeding the critical states defined for slope stability and monitoring the uniformity of the object settlement process. A special case of such objects are landfills built of various anthropogenic materials. Heterogeneous building material causes increased values of displacements in relation to other geotechnical objects and requires that measurement works be carried out throughout the entire life cycle of the landfill: both in the exploitation phase, during the reclamation period and in the post-exploitation phase. This study presents the methodology of geodetic measurements of deformation of geotechnical objects on the example of the Radiowo landfill and the results of this type of measurements carried out for 30 years on this object. The analysis of the literature has also shown that, in addition to the commonly used geodetic methods, it is possible to use modern measurement methods such as laser scanning and photogrammetry, which are more and more often successfully used in the measurement of this type of structures. These methods can be an interesting alternative in measuring the displacement of landfills or constitute their perfect supplement.
</abstract>

Geodetic monitoring of geotechnical structures displacements: a case study of Radiowo landfill site in warsaw

AHEAD OF PRINT

Volume 21 (2022): Issue 2 (June 2022)

Volume 21 (2022): Issue 1 (March 2022)

Volume 20 (2021): Issue 4 (December 2021)

Volume 20 (2021): Issue 3 (September 2021)

Volume 20 (2021): Issue 2 (June 2021)

Volume 20 (2021): Issue 1 (March 2021)

Volume 19 (2020): Issue 4 (December 2020)

Volume 19 (2020): Issue 3 (September 2020)

Volume 19 (2020): Issue 2 (June 2020)

Volume 19 (2020): Issue 1 (March 2020)

Acta Scientiarum Polonorum Architectura

 Acta Scientiarum Polonorum Architectura aims to provide a multidisciplinary forum for researchers, designers, engineers and administration staff, involved in different fields of architecture and civil engineering. The topics include but are not limited to:    sustainable architecture  construction materials and products  mathematical modelling  soil mechanics and geotechnical engineering  environmental aspects of civil engineering  technology &amp; management of construction processes  spatial development and land use planning   Archiving  Sciendo archives the contents of this journal in Portico - digital long-term preservation service of scholarly books, journals and collections.  Plagiarism Policy  The editorial board is participating in a growing community of Similarity Check System's users in order to ensure that the content published is original and trustworthy. Similarity Check is a medium that allows for comprehensive manuscripts screening, aimed to eliminate plagiarism and provide a high standard and quality peer-review process. 