Quantitative prediction method for high side wall displacement of cavern group in steeply inclined layered rock mass

Abstract

The invention provides a method for quantitatively predicting the displacement of high side walls of cavern groups in steeply inclined layered rock mass, comprising the following steps: installing an ESG microseismic monitoring system, capturing microseismic events occurring in the side wall area, and establishing microseismic databases I and II; Numerical calculation model, using FLAC3D software to simulate and calculate the excavation process according to the site excavation plan of the underground cavern; determine the influence range of each microseismic event in the microseismic database I and calculate the seismic efficiency; calculate the mechanical strength parameters after the degradation of the grid unit , after each microseismic event is captured by the ESG microseismic monitoring system, the degraded mechanical strength parameters of the grid units are substituted into the calculation model and simulated to obtain the displacement values ​​of all grid units after the microseismic event occurs. The centroid coordinates of the grid cells can be used to calculate the predicted displacement values ​​of the layered surrounding rocks at various parts of the side wall area of ​​the underground cavern, thus realizing the real-time quantitative prediction of the displacement of the high side wall.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering, and relates to a method for quantitatively predicting the displacement of high side walls of cavern groups in steeply inclined layered rock mass. Background technique [0002] Layered rock mass is a kind of rock mass with typical structural characteristics and widely distributed in nature, and the layer is the dominant original structural plane in this type of rock mass. Since the scale of the layer is often larger than the random joints, the layer will not be completely exposed after the excavation of ordinary underground caverns. Therefore, the construction of underground caverns with small cross-sectional dimensions is less likely to encounter serious deformation and instability induced by the layer. Phenomenon. Compared with ordinary-sized underground caverns such as traffic tunnel projects, hydropower underground caverns are excavated on a large scale and have typical high side walls...

AI Technical Summary

Problems solved by technology

In summary, there is currently no accurate, efficient and convenient method for the accurate and quantitative prediction of the displacement of high side walls of caverns in large steeply inclined layered rock mass caverns.

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