Rational burying depth calculation method for constructing subsea tunnel by shield method

Abstract

The invention discloses a rational burying depth calculation method for constructing a subsea tunnel by a shield method. The method comprises the steps of determining meteorological, hydrological andgeological environment conditions of a to-be-constructed subsea tunnel region, and obtaining hydraulics parameter values and physical mechanics parameters of a rock-soil body; obtaining previous subsea tunnel cases, performing arrangement on construction information of single-hole / multi-hole tunnels with different geological conditions and diameters, and analyzing existent factors, influencing theburying depth, of the to-be-constructed subsea tunnel region; by an engineering analogy method and a numerical calculation method, determining different burying depth values under the influence of the factors; and by a weight analysis method, calculating out weight values of judgment factors to obtain a final burying depth value.

Description

technical field [0001] The invention relates to a method for calculating a reasonable buried depth of a subsea tunnel constructed by a shield method. Background technique [0002] Economic development and cultural exchanges have put forward higher requirements for transportation. Straits and estuaries are like natural moats, separating the mainland from the mainland, the mainland from the islands, and the islands from the islands, bringing a lot of inconvenience to travel. Underwater tunnels can solve this problem well. Underwater tunnels mainly include mine method, shield method, immersed tube method, cofferdam open cut method, etc. The shield tunneling method is a fully mechanical construction method that uses a shield machine to excavate underground and build a tunnel. Since Britain first used the shield method to build a tunnel under the River Thames in London, England, shield technology has a history of more than 150 years. With the development of science and techno...

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Problems solved by technology

[0008] In short, in terms of design and calculation of the reasonable buried depth of shield tunnels, there is a lack of systematic calculation methods that can take into account the water and soil pressure on the segment, the topographic features of the seabed, geological conditions, internal force values ​​of the structure, structural deformation, excavation Surface stability, foundation settlement, surface settlement, anti-floating stability, tidal strength, seabed scour strength, water erosion capacity, tunnel section size, tunnel length, grouting support pressure, tunneling parameter settings (thrust, cutterhead rotation speed, cutter head torque, tunneling speed), structural response of accidental load and dynamic response of rock and soil layer (wreck, explosion, earthquake load), shaft and muck treatment technology, engineering experience, engineering cost, environmental protection requirements, engineering safety and Occupational health management these factors as a comprehensive consideration

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