Method for calculating bending moment and strain of underground pipeline caused by ground access type shield construction

Abstract

The invention provides a method for calculating a bending moment and strain of an underground pipeline caused by ground access type shield construction. A computational formula of vertical soil deformation caused by soil loss is proposed in the ground access type shield tunnel construction based on a three-dimensional solution of a uniform soil movement model of a shield tunnel; and based on a Winkler model of beam on elastic foundation, in combination with the computational formula of vertical soil deformation, a computational formula of the bending moment and the strain of the underground pipeline caused by the ground access type shield construction is deduced. According to the method provided by the invention, the bending moment and the strain of the nearby underground pipeline in actual ground access type shield construction are predicted by theoretical formulas to provide prevention and guidance for the engineering and provide research basis for future researches on the influence of the ground access type shield construction to nearby pipelines.

Description

technical field [0001] The invention belongs to the technical field of underground engineering, and in particular relates to a method for calculating bending moments and strains of underground pipelines caused by the construction of ground access shield tunnels. Background technique [0002] The existing research objects only focus on the construction of pipe jacking, horizontal shield tunneling and double-circle shield tunneling, and there is no derivation of the calculation formulas for the bending moment and strain of adjacent underground pipelines caused by the construction of ground access shield tunneling at a certain angle. [0003] The construction method of the ground access shield tunneling method is quite different from the traditional shield tunneling method. The conventional shield tunneling method generally requires that the soil covering depth at the top of the tunnel is not less than the diameter of the shield (generally 6.2m for subways), while the ground ac...

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Problems solved by technology

[0004] In order to solve the problem of the size of the force deformation of adjacent underground pipelines caused by special working conditions in the above technical problems, and to provide a formula basis for future on-site construction and theoretical research, this patent considers the angle β between the tunnel axis and the horizontal plane (that is, the tunnel axis buried depth change), provide a calculation method for the bending moment and strain of underground pipelines caused by ground access shield construction, and deduce the calculation formula of bending moment and strain of underground pipelines caused by ground access shield construction

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