High side wall displacement quantitative prediction method for a steeply-inclined stratified rock cavern group

Abstract

The invention provides a high side wall displacement quantitative prediction method for a steeply-inclined stratified rock cavern group. The method comprises the following steps: installing an ESG micro-seismic monitoring system, capturing a micro-seismic event occurring in a side wall area, and establishing micro-seismic databases I and II; establishing a numerical calculation model, and performing simulation calculation on an excavation process by adopting FLAC3D software according to a field excavation scheme of the underground cavern; determining the influence range of each micro-seismic event in the micro-seismic database I and calculating the seismic efficiency; calculating a mechanical strength parameter after the grid unit is degraded; after the ESG micro-seismic monitoring systemcaptures a micro-seismic event each time, substituting the mechanical strength parameters after grid unit degrading into a calculation model and carrying out analog calculation; obtaining the displacement values of all the grid units after the micro-seismic event occurs, and calculating a predicted displacement value of the layered surrounding rock of each part of the underground cavern side wallarea by combining the centroid coordinates of each grid unit, so as to realize 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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