Calculation Method of Vertical Deformation of Soil Caused by Ground Access Shield Tunnel Construction

Abstract

The invention provides a method for calculating soil vertical deformation caused by ground in-and-out type shield tunnel construction. Due to the fact that it is truly considered that a certain included angle beta is formed between a shield impelling direction / all forces and the horizontal plane computational formulas of the soil vertical deformation caused by cutting face additional thrust, shield shell friction force, additional grouting pressure, soil losses and other factors are provided. Under the construction conditions of simulating different parameters according to specific site construction parameters such as the front face additional thrust p1 on the cutting face unit area, the excavation face shield axis burial depth h, the shield tunneling machine outer diameter D, the Poisson's ratio mu of soil, the shearing elasticity modulus G of the soil and the compression modulus Es of the soil, the magnitude of the soil vertical deformation of any position in the soil can be generated. If ground surface settlement exceeds a corresponding allowable value, the related construction parameters need to be adjusted, trial is carried out till the soil vertical deformation is smaller than or equal to the corresponding allowable value, and therefore construction reaches safety standards.

Description

technical field [0001] The invention belongs to the technical field of underground engineering, and relates to a method for calculating the vertical deformation of soil caused by the construction of a ground access type shield tunnel. Background technique [0002] The construction method of the ground access shield tunneling method is quite different from the traditional shield tunneling method. In conventional shield tunneling construction, it is generally required that the soil covering depth at the top of the tunnel is not less than the diameter of the shield machine (generally 6.2m for subways). The disturbance of the soil is large, so it may cause damage to adjacent underground pipelines and buildings, and there is a serious potential safety hazard. [0003] Lin Cungang [1] Combined with the shield tunnel project across the river on Qingchun Road in Hangzhou, based on the Mindlin solution, the ground soil caused by the vertical and horizontal components of the additio...

AI Technical Summary

Problems solved by technology

However, the coordinate setting of the calculation formula only considers the angle β between the direction of q and f and the horizontal plane, and does not consider the angle between the shield axis and the horizontal plane (see figure 1 a), that is, assuming that the shield tunneling direction is horizontal and ignoring the variation of the buried depth of the shield tunneling, the calculation results obtained from this are inconsistent with the actual situation, which brings potential safety hazards to the project

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