Large surface mine landslide disaster early-warning method based on fiber bragg grating

Abstract

The invention discloses a large surface mine landslide disaster early-warning method based on a fiber bragg grating. The method comprises the steps that (1) an anchor rod group is arranged on a slopeaccording to the anchor rod reinforcing design norm and structural surface distribution law of a large non-coal surface mine slope, and multifunctional fiber bragg grating sensors are pasted on anchorrods according to set spacing; (2) stress, strain, displacement and temperature monitored by the sensors are collected; (3) data is preprocessed and saved; (4) an optical signal is converted into anelectric signal; (5) the electric signal is filtered; (6) MATLAB software is utilized to process the signal and extract the stress, strain, displacement and temperature of the anchor rods; and (7) a limit equilibrium method or a strength reduction method is utilized to calculate safety coefficients of an overall slope, a combined step slope and a step slope in real time, and local slopes with thesafety coefficients not meeting requirements are reinforced. Through the method, early-warning accuracy of a large surface mine landslide is improved, and full-coverage real-time monitoring and early-warning of a large surface mine landslide disaster can be realized.

Description

technical field [0001] The invention belongs to the technical field of early warning of disasters in non-coal open-pit mines, and in particular relates to a method for early warning of landslides in large open-pit mines based on optical fiber gratings. Background technique [0002] In recent years, my country's rapid economic development has brought great benefits to people's lives. There are more and more large-scale construction projects related to the national economy and people's livelihood, such as water conservancy and hydropower projects, mining projects, and transportation projects. And these engineering constructions have also brought more engineering rock mass problems, the most serious of which is slope stability. Slope instability will not only cause engineering construction problems, but also cause heavy casualties and serious economic losses. Slope reinforcement is an important means to ensure the safety and stability of slopes. At present, the commonly used s...

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Problems solved by technology

However, because the research on anchoring theory has always lagged behind engineering practice, and most projects use empirical methods, the obtained physical and mechanical parameter values ​​are quite different from the actual situation, and even the design theory cannot reflect the internal mechanical mechanism of anchorage to a large extent. , this phenomenon is especially obvious when the anchorage structure is sheared

Furthermore, the slopes of large-scale open-pit mines are divided into overall slopes, combined step slopes and step slopes. The anchors for strengthening the overall slopes should be arranged on the step slopes, which also play an important role in strengthening the step slopes. As a result, a bolt is sheared by the potential slip surface of the slope in many places, and the different scales of the slip surface also bring about the size effect problem, which makes the instability and damage of the bolt more complicated.

At present, it is impossible to accurately solve the landslide problem of large open-pit mines through laboratory model tests or numerical simulations

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