Canyon high-stress area hard rock large underground cavern axis arrangement quantitative design method

Abstract

The invention discloses a canyon high-stress area hard rock large underground cavern axis arrangement quantitative design method. The method comprises: obtaining an engineering area principal stress value, orientation and spatial distribution through in-situ ground stress testing and inversion analysis; calculating to obtain a damage stress intensity ratio by utilizing the obtained rock saturateduniaxial compressive strength and damage stress; carrying out hard rock judgment by adopting a saturated uniaxial compressive strength value; comprehensively performing high ground stress area division by adopting the first principal stress value and the rock strength-stress ratio; for the arrangement design of the hard rock underground cavern in the high-stress area, using the included angle between the maximum horizontal principal stress direction and the axis direction of the main cavern and the surrounding rock disturbance stress intensity ratio DSSR as the most important factors for determining the cavern arrangement; according to the judgment standard of the surrounding rock disturbance stress intensity ratio, quantifying the included angle between the maximum horizontal principal stress direction and the axis direction of the main cavern. The method has the advantages of being scientific, perfect, clear in index and easy to implement, the construction risk can be reduced, and the overall stability of the underground cavern group is improved.

Description

technical field [0001] The present invention relates to the technical field of underground cavern design methods, in particular to a quantitative design method for axis layout of large-scale underground caverns in hard rock in high-stress areas of canyons, which is suitable for layout design of large-scale underground caverns in high-stress areas dominated by hard and brittle rocks . Background technique [0002] With the implementation of my country's western development strategy, more and more large-scale hydropower projects and energy storage power stations have entered the construction period, and most of them are designed with large or super large underground caverns as the main hydraulic structures. Due to the strong modern crustal activity, high in-situ stress field and significant external dynamic geological action in the western region, most of the deep-buried large underground caverns in the western region are in a high in-situ stress environment. Studies have sho...

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Problems solved by technology

The stability of the surrounding rock of the cavern should be determined comprehensively by the components of the in-situ stress field. Simply using the horizontal projection direction of the maximum principal stress to determine the direction of the cavern axis cannot reasonably reflect the spatial distribution characteristics of the in-situ stress field.

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