Quick assessment method for site selection of underground powerhouse cavern of hydropower station

Abstract

The invention discloses a quick assessment method for site selection of an underground powerhouse cavern of a hydropower station, relates to the field of hydraulic and hydroelectric engineering, and provides an assessment method capable of objectively and quickly judging the site selection condition of an underground powerhouse cavern of a hydropower station. The method comprises the following steps: A, summarizing and classifying factors influencing site selection to obtain factor sets; B, endowing each factor set with a total score according to the influence degree on site selection, and distributing the total score of each factor set to factors of the factor set to obtain a total score of each factor; C, determining the actual score of each factor according to the difference between the actual condition and the ideal condition of each factor; and D, calculating the actual score sum of each factor, and judging whether the target address is suitable for building the underground powerhouse cavern according to the difference between the score sum and the total score. By adopting the method, numerous factors involved in site selection of the traditional underground powerhouse cavern are quantified and unified in the same assessment system for assessing via a large amount of existing engineering examples and numerical analysis results.

Description

technical field [0001] The invention relates to the field of water conservancy and hydropower engineering, in particular to a quick evaluation method for site selection of an underground powerhouse cavern of a hydropower station. Background technique [0002] For a long time, in the water conservancy and hydropower engineering industry, the problem of location comparison and selection of underground (plant) caverns is often involved, especially for some large (medium) hydropower projects. Location selection is of great significance to surrounding rock stability, engineering safety, investment control, and long-term stable operation. However, there are various factors involved in the location selection of large underground caverns in the hydropower industry, including: the size of the cavern itself, the characteristics of in-situ stress in the site area, the ratio of rock strength to stress, the identified geological defects, the relationship with the upstream and downstream ...

AI Technical Summary

Problems solved by technology

[0006] During the construction period of some underground projects, rock bursts, surrounding rock unloading deformation, large relaxation depth, plastic zone penetration and even landslides occurred, which threatened the safety of the project and caused delays in the construction period and increased investment.

It can be seen that improper cavern layout will bring negative benefits such as increased difficulty of excavation and support, increased safety risks, increased investment, and extended construction period.

At the same time, the conditions in these processes have become extremely complicated due to the impact of construction, and cannot be directly related to the success or failure of the initial cavern location selection. In consideration of the tight construction schedule, evaluation, comparison and summary are often not carried out in time, and there is no correction for future projects. ,enhancement

[0007] In addition, the site selection of underground caverns between different projects is difficult to compare and evaluate on the same platform because of project scale, characteristics, and project environment, which brings certain difficulties to project operation management and experience summary.

Images