Method for distinguishing position of rockburst risk on deep buried tunnel section

Abstract

The invention discloses a method for distinguishing the position of a rockburst risk on a deep buried tunnel section. The method comprises the following steps: A, performing numerical simulation analysis according to the shape of a section, engineering geology, conditions of initial ground stress and an excavation method before tunnel excavation, to be specific, a, performing indoor rock mechanics experiments and parametric inversion; b, confirming a three-dimensional initial ground stress field; c, constructing a geometrical model for three-dimensional numerical calculation according to stratigraphic distribution, geologic construction and the size of the tunnel section; d, implementing numerical calculation and analysis of a tunnel excavation process for the geometrical model; e, analyzing the distributed situation of the local energy release rate on the tunnel section; B, monitoring slight shock in a real-time mode in the tunnel excavation process, to be specific, 1, mounting a sensor at the rear part of a tunnel face; 2, collecting slight shock signals in the process of the micro fracture of rock mass to invert the occurrence position of the micro fracture of surrounding rocks; 3, analyzing the projection distribution of micro fracture events on the tunnel section; C, performing comprehensive evaluation on the distinguished occurrence positions of the rockburst risk. Through the adoption of the method, the occurrence of rockburst disasters is reduced or avoided, and the construction safety and the construction progress are ensured.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to a method for discriminating rockburst risk positions on deep-buried tunnel sections, and is applicable to deep-buried hard rock tunnel projects such as mines, transportation, water conservancy and hydropower. Background technique [0002] Rockburst disasters often occur under high stress conditions or during the excavation of deep hard rock tunnels. Some deep-buried tunnel projects (such as Erlangshan Highway Tunnel, Jinping II Hydropower Station Traffic Auxiliary Tunnel, Qinling Railway Tunnel II, Cangling Highway Tunnel, and Taipingyi, Tianshengqiao, Ertan, Jinping II, Norway Sima and other large The results of statistical analysis of rockburst records in the diversion tunnel of the hydropower station) show that rockbursts do not all occur on the entire section of the tunnel, but mainly occur at a certain local position on the tunnel section, such as the vault, spandrel, arch...

AI Technical Summary

Problems solved by technology

[0006] In summary, in order to improve the pertinence of rockburst prevention measures and the effect of rockburst treatment, a method for identifying the rockburst risk location on the deep tunnel section based on the local energy release rate and the accumulation of micro-fracture events is needed. In this regard, There are no related literature reports so far

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