Prediction of Ground Subsidence During Underground Construction of Metro Line 2, Section 1, Ben Thanh - Tham Luong

Urban metro line No. 2 from An Suong station to Thu Thiem is one of the six metro lines thatis planned to be built in Ho Chi Minh City (HCMC). The metro line goes through the area in which thestratigraphy consists of many units, distributed from 20-80 m. The hydrogeology mainly has 2 aquifers,namely Holocene, and Pleistocene which affecting the deep excavation. During construction, there willbe some problems that will affect the work on the surface such as settlement, cracking, and damage. Byfinite element method on Plaxis software, the article forecasts the surface settlement during this metroline No.2. The results show that the ground settlement is relatively large in areas with soft groundstructures. The settlement results depend on the geological structure characteristics, hydrogeologicalcharacteristics, and the shape and size of the tunnels.

SAMARA CITY UNDERGROUND URBANIZATION DEVELOPMENT AND ITS CONSEQUENCES

Nowadays the area of cities is almost everywhere increasing - the territory urbanization is developing. At the same time, due to lack of land resources, the underground space development intensifi es, and the underground construction volume increases, i.e., underground urbanization takes place. This process has undoubtedly positive results, as it can help solve territorial, transport, environmental and other problems of cities while preserving the unique appearance of buildings in the historical centers of cities. At the same time, some engineering and geological processes may be activated as a negative underground urbanization result. The article deals with underground urbanization history in Samara and defi nes its main stages. More than one million people live in Samara city, subway line was built, there are subway objects of industrial and defense importance (bunkers) reaching considerable depth. Active underground construction can lead to geological processes strengthening (weathering, karst formation, suff osia, etc.), change of strength properties of rocks, violation of natural hydrological regime of the territory. The territory of Samara has an inhomogeneous geological structure and complex engineering and geological construction conditions. Seven engineering-geological districts have been identifi ed and studied, on the territory where underground construction development can lead to diff erent, including negative, consequences.

Exploration and Thinking on the Information Construction and Management of the Military Key Laboratory

Informatization is the core of modern military development. It is necessary to pay attention to and strengthen the informatization construction of military key laboratory to win the information war. Based on the analysis of the traditional management mode of laboratory and its disadvantages, combined with the practice and exploration of information construction and management of military key laboratory of military underground construction engineering in recent years, this paper comprehensively analyzes and deeply discusses the achievements and experience of laboratory in information construction and management, as well as the existing problems and lessons. Practice shows that the laboratory has made significant progress and benefits in the information construction and management, but there are still some contradictions and problems to be solved.

Modeling of scenarios for the underground construction planning based on the foresight and cognitive modeling methodologies

The modeling of scenarios for the underground construction planning is based on the mathematical support of fore sight methodology aimed at the creation of alternative scenarios and the cognitive modeling to build scenarios for the development of a desired future and ways of their implementation. We propose to use these methodologies together: the results obtained at the stage of the foresight methodology should be used as initial data for the cognitive modeling. Using the foresight process at the first stage of modeling allows us, with the help of expert assessment procedures, to identify critical technologies and to construct the alternatives of scenarios with quantitative characteristics. For the justified implementation of a particular scenario, the cognitive modeling allows one to build causal relationships with the consideration of a large number of interconnections and interdependences. The developed strategy is applied to the study of underground construction objects in order to select reasonable scenarios for their future development.

Safety Management System Prototype/Framework of Deep Foundation Pit Based on BIM and IoT

With the huge demand for building underground spaces, deep foundation pits are becoming more and more common in underground construction. Due to the serious effects associated with accidents that occur in deep foundation pits, it is very important for underground construction safety management to be proactive, targeted, and effective. This research develops a conceptual framework adopting BIM and IoT to aid the identification and evaluation of hazards in deep foundation pit construction sites using an automated early warning system. Based on the accident analysis, the system framework of Safety Management System of Deep Foundation Pits (SMSoDFP) is proposed; it includes a function requirement, system modules, and information needs. Further, the implementation principles are studied; they cover hazardous areas, namely, visualization, personnel position monitoring, structural deformation monitoring, and automatic warning. Finally, a case study is used to demonstrate the effectiveness and feasibility of the system proposed. This research provides suggestions for on-site management and information integration of deep foundation pits, with a view to improving the safety management efficiency of construction sites and reducing accidents.