Russian Federation
Russian Federation
UDC 69.04
Objective: to substantiate the possibility of using a new method of constructing underwater urban tunnels in unrelated muddy soils. The proposed technology is the construction of the subsurface of underwater urban tunnels (for various purposes) by pressing sections from a pre-prepared launch pit under the bottom of a watercourse (at an insignificant depth) without excavation, which has no analogues in the domestic tunneling industry. It is necessary to calculate and analyze the stress-strain state using numerical modeling methods of the “soil massive-pressed sections” system and develop measures to reduce the friction resistance of the outer surface of the section on the ground and the frontal resistance of the soil in the face during the production of punching operations Methods: to achieve this goal, a numerical model was built in the specialized geotechnical software complex MIDAS GTS NX a soil massive containing the entire structure of the subsurface section of the underwater tunnel: pressed tunnel sections, a screen of pipes in the base, foundations. Results: according to geotechnical calculations, to ensure the reliability of the structure, it is necessary to use a grillage device for a pile foundation for pipes D1020 mm, which reduces tunnel precipitation and ensures stability during operation. Measures have been developed to reduce the friction resistance of the outer surface of the pressed sections and the frontal resistance of the soil in the face. The design of a wedge-shaped knife section in combination with a metal formwork is proposed, which performs the function of external metal waterproofing at the construction stage. Practical significance: the conducted research confirms the possibility of using the proposed method for the construction of urban underwater tunnels of short length in unrelated muddy soils with a minimum depth of tunnel laying, which significantly reduces its length and can be recommended for practical use after conducting a series of studies based on a testing (analytical) laboratory and a number of field tests.
underwater urban tunnel, weak silty soils, penetration without excavation, wedge-shaped structure, frontal resistance, pipe foundation, pile foundation
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