Sensitivity analysis of stability of anti-dip rock slope under fluctuating water level in the Three Gorges Reservoir Area

The fluctuation of water levels in large reservoirs has long been recognized as a critical external factor that affects the stability of bank slopes. However, there have been limited studies investigating the influence of reservoir water level (RWL) fluctuation on anti-dip layered rock slopes. In this study, we constructed a conceptual model by selecting the sandstone in the Three Gorges Reservoir Area (TRGA) as the strata and considering variations in strata thickness, strata dip angle, permeability coefficient, RWL fluctuation rate, and slope height. Through seepage-stress field coupled analysis, we obtained the seepage field and groundwater lines, and determined the factor of safety (FoS) using the improved cantilever beam limit equilibrium method. We then investigated the variations of the groundwater line and FoS throughout the entire process of RWL rising and drawdown. Our results indicate that the changes in groundwater levels in the slope clearly lag behind RWL fluctuations, with stability improving during the rising stage but deteriorating during the drawdown stage. Range analysis, using the maximum curvature (MaxCurve) of the groundwater level line as the reference, reveals that the permeability coefficient has the most significant impact on the lagging effect, followed by the fluctuation rate, thickness, and dip angle. Similarly, when considering the amplitude of variation in FoS during the entire process of RWL rising and drawdown as the reference, range analysis shows that the permeability coefficient has the greatest impact on stability variation, followed by the fluctuation rate, thickness, dip angle, and slope height

ORGANIZATION OF THE SYSTEM OF MACROECONOMIC ANALYSIS AND FORECASTING IN THE REPUBLIC OF UZBEKISTAN

The relevance of the topic is related to the need to organize systems of macroeconomic analysis, as well as to improve the accuracy of forecasting in the Republic of Uzbekistan. In this regard, the development of a socio-economic development forecast for various scenarios that take into account risks and opportunities seems to be the most important task for the economy of the Republic of Uzbekistan. The purpose of the study is to identify mechanisms and develop proposals for improving economic growth and investment attractiveness in the Republic of Uzbekistan. The subject of the study is the system of macroeconomic analysis and forecasting in the Republic of Uzbekistan in the medium term. The method or methodology of the study is based on the study of key current and retrospective data on the state of the sectors of the economy of the Republic of Uzbekistan, highlighting the most important risks for building a medium-term forecast. As a result of the work carried out, the key components of the public sector, financial and credit markets were analyzed, and an assessment was made of the impact of the worsening external environment. Thus, the paper presents estimates of the prerequisites for the forecast and develops possible scenarios for the development of sectors of the economy of the Republic of Uzbekistan. The scientific novelty of the study lies in the development of unique forecasts for the development of sectors of the economy of the Republic of Uzbekistan. The recommendations received as a result of the study indicate the need to develop mechanisms for responding to certain risks for the economy of the Republic of Uzbekistan, taking into account the possible consequences of such an impact presented in the forecast.&nbsp

Hygrothermal Behaviour of Non-traditional Mortars and ConcretesEva Barreira1, Ricardo M.S.F. Almeida1,2 and Margarida Pais

In 2015, the European Commission adopted a Circular Economy Action Plan to stimulate the transition of European countries towards the circular economy. In the 2030 Agenda, which includes the 17 Sustainable Development Goals, the United Nations has also defined targets to be implemented by the construction sector based on circular economy concepts. In this context, the importance of directing the development of the construction sector towards sustainable solutions to address the challenges of energy consumption, climate change, resource reduction and waste production is undeniable. Waste incorporation in thermal mortars is already under study by several authors. Among the possibilities of producing sustainable mortars, the reduction of natural aggregates in their preparation, such as sand, or of binders, such as cement, stands out. The incorporation of residual materials in mortars is, therefore, a possible alternative to guarantee more sustainable solutions. The objective of this work was to evaluate the hygrothermal behaviour of non-traditional mortars and concretes, such as fibre-reinforced mortar (P1); sprayable thermal insulation mortar (P2); mortar with granulated cork (P3); concrete with expanded clay (P4); concrete with metallic fibres (P5); cement mortar with construction and demolition waste (P6). The thermal conductivity of these materials, with different moisture contents, from totally dry to saturated after 24 hours of total immersion was determined. The results showed that the thermal conductivity values of the dry materials were similar to those found in the literature. After the 24 hours of humidification, there was, as expected, an increase in mass, with a minimum of 2% for specimen P3 and a maximum of 51% for specimen P2. Regarding the thermal conductivity, there was also an increase in its value for higher moisture contents, being that increase more relevant in specimen P2, with a variation of 294%, and less relevant in specimen P5, with a variation of 18%

Transforming low-quality sand into construction materials under 110℃ and Recycling of the Waste Solution

A strong and eco-friendly material was transformed from low-quality sand via sol-gel method with ethanol as the solvent. 110oC was chosen as a target temperature because it is the average day temperature of the moon, which may be the first place for extraterrestrial development. The appropriate KOH content and ethanol concentration can improve the reaction degree and limit the side reaction. The main results indicated that the highest compressive strength (38 MPa) of the produced material could be obtained by using 20 mass% KOH and 90 V/V% ethanol. According to XRD and FTIR analysis, the formation of sanidine, zeolite, and tetraethoxysilane is the main reason for strength enhancement. Sanidine and zeolite could fill the gap between sand particles and tetraethoxysilane is a good consolidate. Excess ethanol in the waste solution can be reused with recycle rate above 65%. The total carbon emission is 197 kg CO2 eq/m2 after recycling waste solution, which is 35.82% of that produced by normal concrete. Therefore, a tough construction material can be synthesized from lowquality sand, which can partially substitute concrete. This material can address the shortage of raw materials for concrete and can be utilised for extra-terrestrial construction

CONSUMPTION, LEISURE, SOCIAL INTERACTIONS: THE WAY OF LIFE OF RUSSIANS IN CONDITIONS OF INSTABILITY

The aim of the study is to identify the features of lifestyle and social practices in the spheres of consumption, leisure and social interactions, implemented by various groups of the population in conditions of instability. Informational base of the study is questionnaire surveys, held in 2021-2022, each of which was conducted based on all over Russia representative sample. The review of theoretical and conceptual developments allowed to classify main approaches to understanding of lifestyle in social sciences. The analysis of empirical data produced the opportunity to examine online consumption practices settled in the post pandemic period and specifics of consumption in conditions of new 2022 risks. Models and limitations of implementing leisure practices were studied. There were studied the specifics of social interactions system including in the context of its resource significance from the point of view of adaptational tasks

VET STAFFING MODELS DEPENDING ON THE SOCIO-ECONOMIC DEVELOPMENT OF THE RUSSIAN FEDERATION’S REGIONS

Professional and teaching personnel training and the staffing of the secondary vocational education (SVE) system is one of the most important tasks both in the Russian education state policy and in scientific research. The problem of the SVE digital transformation and building the corresponding teachers’ competencies, the legislative requirements for educational activities, the new requirements for SVE teachers in the framework of the federal project "Professionality" are tasks that require balanced decisions at the federal and regional levels. Significant events of the last three years (the COVID-19 pandemic, global economic crisis, challenging foreign policy situation) result in the need to focus on updating the SVE teaching staff competencies. Equally pressing are the “eternal” problems, including the aging of teaching staff and the predominance of female teachers in the secondary vocational education system, ways to rejuvenate teaching staff in the SVE institutions and ways to obtain pedagogical qualifications in secondary vocational education, ensuring targeting and personalization of the teachers’ educational trajectories through additional professional education. The purpose of the preprint is to present the analysis of staffing models for the secondary vocational education system, taking into account domestic and foreign approaches, and to develop proposals for building a perspective model for staffing the secondary vocational education system. The study is based on the methodology of system analysis, uses the methods of comparative analysis, systematization and generalization of scientific literature and educational practice, the modeling method. As a result of the study, the characteristics of the staffing models of the vocational education system were presented based on the analysis of foreign and domestic experience in building and developing staffing requirements for the vocational education and training system. The novelty is connected to the development of proposals for building a future-oriented model of secondary vocational education system staffing. The results of the study can be applied in making decisions on the formation and development of staffing system for secondary vocational education at the federal and regional levels.&nbsp