A Calculation Method for Excavation Surface Deformation of Soft Rock Tunnel

Abstract

The invention discloses a method for calculating the deformation of the excavation surface of a soft rock tunnel, which comprises the following steps: (1) limiting the basic assumptions of the tunnel; (2) establishing a constitutive equation; (3) establishing a basic equation for the deformation problem of the tunnel; (4) ) Establish the analysis model of the surrounding rock in front of the tunnel excavation face and the pre-reinforced bolt under different stress states; (5) Deduce the calculation expressions of the deformation of the tunnel excavation face under different analysis models. The present invention establishes the analysis models of the surrounding rock in front of the tunnel excavation face and the pre-reinforced bolt under different stress states, and deduces the calculation expressions of the deformation of the tunnel excavation face under different analysis models, which facilitates the analysis of the buried depth and cohesion of the tunnel , The influence of the length, stiffness and strength of the pre-reinforced bolt on the stress and displacement of the surrounding rock of the excavation face, so as to provide theoretical and technical guidance for the excavation construction of soft rock tunnels, and can effectively solve the safety problems of soft rock tunnel construction.

Description

technical field [0001] The invention relates to the field of tunnel engineering, in particular to a calculation method for deformation of an excavation surface of a soft rock tunnel. Background technique [0002] Soft rock is a complex rock mechanical medium with significant plastic deformation in a specific environment. It has low strength, large porosity, and poor cementation, and is prone to deformation during construction, causing tunnel collapse. According to the Accident Inquiry System of the State Administration of Work Safety and public reports from the media, statistical analysis of 49 cases of tunnel construction collapse accidents between 2006 and 2016 resulted in 208 deaths and 47 injuries, with an average annual death toll of 20. It can be seen that the collapse of soft rock tunnels has always been one of the important core problems that plague the safe construction of tunnels in my country. [0003] As the main excavation surface of tunnel construction, the e...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for calculating the deformation of the excavation surface of soft rock tunnels, aiming at the lack of systematic research on the deformation of the excavation surface of soft rock tunnels in the relevant research on soft rock tunnels. Close 3D numerical model of the tunnel, on the basis of the existing research results, establish the tunnel analysis model, establish the calculation method of horizontal extrusion displacement and deformation response characteristics of the excavation surface of soft rock tunnel, and provide a theory for the excavation construction technology of deep buried soft rock tunnel and practical basis

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