A method and related equipment for analyzing stress data of surrounding rock during full-section tunnel excavation

Abstract

The application discloses a method and related equipment for analyzing the stress data of the surrounding rock in full-section excavation of a tunnel. The vertical distance of the tunnel bottom plane; normalize the vertical distance between all thickness centers and the tunnel bottom plane to be excavated to obtain the gravity coefficient; multiply the gravity value by the corresponding gravity coefficient to obtain the bulk density; according to the bulk density, cohesion and content Friction angle, establish the initial stress 3D grid model of the rock mass within the set range around the tunnel to be excavated; in the initial stress 3D grid model, remove the initial stress 3D grid data of the tunnel to be excavated, and obtain the retained stress 3D grid model; formulate the construction plan for excavation; measure the excavation stress data of the surrounding rock of the tunnel after actual excavation; and correct the three-dimensional mesh model of the retained stress according to the excavation stress data. It can analyze the surrounding rock stress data of complex geological types and structures.

Description

technical field [0001] The present application relates to the technical field of surveying, in particular to a method for analyzing stress data of surrounding rock in full-section tunnel excavation and related equipment. Background technique [0002] Tunnel construction breaks the balance of the natural stress of the rock mass. This unbalanced stress will be adjusted through the unloading rebound stress and gravity distribution stress of the surrounding rock of the tunnel. When the combined effect of the two exceeds the strength of the surrounding rock When the range is limited, the surrounding rock will be destabilized and damaged, which will bring danger to the tunnel construction and maintenance. Therefore, the study of surrounding rock stress is of great significance to the safety of tunnel construction. [0003] At present, there are mainly two ways of qualitative analysis and quantitative analysis in the data analysis methods of surrounding rock stress in tunnel excav...

AI Technical Summary

Problems solved by technology

Qualitative analysis mainly includes empirical analogy method and rock mass structure analysis method, etc. These methods qualitatively analyze the stability of surrounding rock and classify surrounding rock types based on the strength of surrounding rock itself and the combination relationship of structural planes, but cannot provide the specific stress required for design. value

Quantitative analysis mainly includes technical means such as analytical method and limit analysis method. For simple surrounding rocks, the analytical method and limit analysis method can be used to obtain ideal results through model generalization. However, when the total number of geological types of surrounding rocks is large , when the inter-combination relationship is more complex, neither of these two methods can fit well with the actual situation.

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