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Monitoring and mathematical modelling of the pit construction impact on the subway tunnels during reconstruction of the Postal Square
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 15th International Conference Monitoring of Geological Processes and Ecological Condition of the Environment, Nov 2021, Volume 2021, p.1 - 5
Abstract
The largest infrastructure projects in Kyiv during the recent years is the Postal Square reconstruction. The following problems were addressed: ensuring the reliable subway line operation; strength and reliability of structures under construction; preservation of the territory original hydrogeological regime; other issues. The site of the designed underground structure construction is adjacent to the subway tunnels location area. The distance from the pit enclosure wall axis is about 16–18 m to the nearest tunnel boundary and 28 m to a more remote tunnel. To determine the degree of influence of the pit enclosure arrangement for the new multifunctional facility on the subway tunnels structures, including the impact of soil excavation from the pit, two tasks are solved. The first task is to determine the pit enclosure structures deformations during excavation. The second problem envisages the determination of the nature of the deformations distribution in the soil mass outside the pit enclosure with an allowance for the subway tunnels inclusion in this mass. The problem is solved using a plane calculation model. In the plane design scheme, the displacements obtained in the result of the first problem solving are used as a load caused by the pit enclosure structures deformations influence on the soil mass.