In order to study the deformation of high fill in the Dalin Railway Station, a typical cross-section was selected. Four rows of settlement plates and slope observation piles were buried in the high fill, and flexible displacement meters were installed on the geogrid at the foot of the slope. After more than two years of observation, it was found that after more than half a year of construction and filling, as well as more than 12 months of standing after completion, the settlement of the high fill tended to stabilize. The maximum percentage of settlement during the filling period to the total settlement is 69.05%. The test results of the observation piles on the left and right slopes show that the high fill slope is also stable, and the maximum proportion of settlement during the filling period is 99.77% of the total settlement. After the filling is completed, the deformation of the geogrid is basically stable, indicating that the slope is also stable. It is recommended to carry out subsequent construction 12 months after the completion of filling.

Combined with the construction case of the large-span circular steel box girder structure at the visitor reception center of Cuiping Mountain Scenic Area in Yibin City, the principle of high-precision assembly technology and key technical points of large-span circular steel box girders were introduced.3D modeling was used to assist in the factory processing of circular steel box girders, the design and installation of temporary support frames, the precise control of steel box girder hoisting and positioning through BIM(building information modeling) technology in conjunction with total station instruments, and the information-based monitoring of the welding process. These key technological processes have been implemented in the project, which not only shortened the construction period and saved costs but also greatly improved the installation accuracy. This has made the overall assembly of the steel box girder structure smoother and the visual effect of the shape better.

Born in the context of digitalization, digital trade is an emerging trade model, which is based on digital technology and transformed through the digitization of trade methods or trade objects.Digital trade in solving the time and space limitations at the same time also led to the emergence of digital trade barriers, which has become a major obstacle in the process of economic globalization. Reducing digital trade barriers and promoting the synergistic development of the global digital economy are of great significance to optimizing the global value chain and enhancing the efficiency of international trade. Focusing on the relationship between digital trade barriers and global value chains, relevant theoretical models were built based on previous research, the development trend of China’s digital trade under the background of “anti-globalization” was discussed, and corresponding countermeasures are put forward to address these issues.

How leaders reduce employees’ sense of work alienation in uncertain environments is a hot topic of academic concern. Taking 494 employees as a sample and using a two-stage questionnaire, from the perspective of social exchange theory, the effect of leader perfectionism on employees’ work alienation, as well as the intermediary mechanism and boundary conditions between superior-subordinate relationship and emotional exhaustion in the relationship between the two were explored. The results show that leader perfectionism has a significant positive effect on employees’ sense of job detachment. Supervisory and subordinate relationships play a partial mediating role between leader perfectionism and job detachment. Emotional exhaustion positively moderates the effect of leader perfectionism on superior-subordinate relationships.

Based on the complex network method to build the 2001—2021 global copper trade network to describe its evolution characteristics, QAP(quadratic assignment problem) analysis was used to explore the impact of factors.It is found that the global copper trade network has a small-world character, and in part, Germany, China, the United States and Italy are the core nodes, in terms of influencing factors, the proximity of countries and the gap of economic development level will promote the copper trade significantly, and the larger the geographical and institutional distance will restrain the copper trade, the index of economic freedom, population and use of the same language will not have a significant impact. In view of this, it is suggested to strengthen cooperation with neighboring regions, increase R&D investment in technological innovation, and ensure the security and stability of China’s copper supply chain.

In order to unify the standard system of smart airport construction and evaluate the development level of smart airport,the evaluation model of smart airport development level based on game combination empowerment-cloud object element is proposed, which will avoid the bias in the process of empowerment and is used to solve the problem of ambiguity and randomness in the evaluation indexes. The model was applied to an airport in Guangdong Province to evaluate the development level of smart airports, and the results show that the evaluation results of the indicators of the development level of smart airports derived from the model are basically consistent with the results of the field visit research and the actual situation, and the evaluation model has the practicability and validity, and it can provide a new way of thinking for the evaluation of the development level of smart airports.

As a kind of self-supporting supporting structure, lattice diaphragm wall is used in soft soil areas such as ports, wharfs and shipyards in the past, but it is rarely used in complex hard rock strata. Taking Laiwushan slope support project in Longhua District of Shenzhen as an example, the construction site preparation, solitary stone treatment, rock entry process, steel cage hoisting, cross steel plate joint treatment and other key processes were discussed, which provide a reference for the construction of similar projects.

In order to further analyze the current research status of Chinese academic circles on community governance in the new era, CiteSpace software was used to analyze the number of publications, institutional cooperation, scholars, keywords and other aspects of the research literature on “community governance” collected by China National Knowledge Network (CNKI) from 2012 to 2023. It is found that the number of papers published in the field of “community governance” has generally shown an upward trend, but there are deficiencies. For example, the cooperation between research institutions and scholars is not close, showing an isolated state. Therefore, it is suggested to strengthen the research cooperation and exchange between research institutions and scholars, and use knowledge of various disciplines to study problems from different perspectives.

In order to effectively activate the dormant assets of oil fields, the abandoned oil and gas wells are transformed into coaxial cased heat exchangers to extract geothermal energy and realise the successive development of energy, taking a shut-down oil well in Dingbian County, Shaanbei as the study example, the borehole heat exchanger module of the open-source software OpenGeoSys was used to study its heat exchange performance. Effects of different circulation flow rates, inner tube diameters of heat exchanger, power of heat exchanger, and seasonal heat extraction cycles on the performance of the transformed well are analyzed. Results show that when the heat exchange power is fixed, a flow rate of 15 m³/h can both obtain a higher outlet water temperature and ensure a long-term stable operation of the heat exchanger, using different diameters, variation of water temperature at the outlet end of the inner tube is only 0.17 ℃. For every additional 50 W of heat exchange power per meter, the outlet water temperature at the end of the heating season decreases by about 17.55 ℃, with an average decrease of 0.35 ℃/W. When the heat exchange power is constant, for every one additional month of a heating season, the annual minimum outlet temperature decreases by about 1 ℃, when the heating season is 4, 5, 6, 7, 8 months, the time required for the outlet temperature to reach a quasi-steady state during the heating season is 15, 18, 21, 24, 27 years, respectively. In order to improve the heat exchange performance of the geothermal well, it is recommended that a seasonal cycle of 5 months of heat extraction and 7 months of well shutdown in Ordos Basin Area should be used, with a circulation flow rate of 15 m³/h and a heat exchange power of 100 W.

As an important area of ecological protection and economic development, Dongting Lake Ecological Economic Zone plays a key role in the sustainable development of the Yangtze River Economic Belt. Based on the data of land use and energy consumption, the carbon income and expenditure of county land use in the economic zone from 2005 to 2020 were calculated. Based on the carbon balance analysis and evaluation system, the counties in the economic zone were divided into four types of carbon balance functional zones. The results show that the carbon emission of land use in Dongting Lake Ecological Economic Zone showed a significant growth trend.The carbon emission of land use in the economic zone shows the distribution characteristics of high in the east and low in the west, and the carbon absorption is high in the west and low in the east. Its distribution pattern is closely related to the land use level and energy consumption structure.