Tunnel counter-slope drainage design method based on water inflow estimation and dynamic monitoring

Abstract

The invention discloses a tunnel counter-slope drainage design method based on water inflow estimation and dynamic monitoring. The method comprises the following steps that on-site geological survey is carried out, geological conditions of sections where a tunnel is located are learned, and water burst risk assessment is carried out on all the sections through first investigation data; based on power minimization optimization, water inflow of all the sections of the tunnel is estimated, a power minimization optimization method is adopted for carrying out grading calculation on pump stations, and optimal water pump power is selected; the power of the pump stations is set according to the optimal water pump power, it is ensured that the power of all the pump stations is set to correspond to the actual water outlet amount of the tunnel, and a counter-slope drainage scheme is set; a TEM transient electromagnetic method and an induced polarization method are adopted for accurately locating water containing areas of the water containing sections of the tunnel, the water content is estimated, the water inflow of the tunnel face can be dynamically monitored in real time, and the set of the counter-slope drainage arrangement is adjusted according to the water inflow, the water inflow change rate and the estimated water content. The water containing areas before the excavated tunnel face can be located accurately, and the water inflow can be estimated accurately.

Description

technical field [0001] The invention relates to a tunnel reverse slope drainage design method based on water inflow estimation and dynamic monitoring. Background technique [0002] Water inrush disasters in tunnel reverse slope construction have always been a difficult problem in tunnel construction, especially as my country's traffic construction environment shifts to the western mountainous areas with extremely complex topographic and geological conditions, long-distance reverse slope construction and related drainage operations have become major technical challenges and difficulties. In recent years, due to the immaturity of long-distance reverse slope construction technology, water inrush disasters have occurred frequently during the construction period. [0003] The long-distance reverse slope construction of the tunnel faces a series of huge technical problems. However, the existing drainage technology follows the conventional technology and does not consider the compr...

AI Technical Summary

Problems solved by technology

[0004] 1) In the previous tunnel reverse slope drainage technology, the design of the drainage system was based on the premise of judging the water inflow based on experience, which often resulted in insufficient or excess drainage capacity of the system due to inaccurate judgments on the changes in the water inflow. Cause water inrush disasters or waste of resource allocation, so it is urgent to study the tunnel long-distance reverse slope drainage optimization technology based on water inflow estimation and dynamic monitoring;

[0005] 2) In the previous design of reverse slope drainage schemes, the classification and power selection of pumps were mostly determined by experience, which often resulted in excess or insufficient drainage capacity. It is urgent to propose an optimal calculation method for pumping station classification and power selection;

[0006] 3) In the previous reverse slope drainage, it was mainly aimed at the sudden water inrush on the face of the tunnel, and there was no special drainage mechanism for the inrush water between the two-stage pumping stations, which could not properly deal with the sudden water inrush between the two-stage pumping stations , and the use of conventional anti-slope drainage schemes for drainage between two-stage pumping stations is likely to result in a large waste of power and cost

Images