Multi-index extensible evaluation method for dangerous rock falling risks in tunnel and underground engineering

Abstract

The invention discloses a multi-index extensible evaluation method for dangerous rock falling ricks in tunnel and underground engineering. The method comprises the following steps of: 1, establishing a dangerous rock falling risk evaluation index system according to main factors inducing side slope dangerous rock mass collapse; 2, establishing a grading standard for dangerous rock falling risk evaluation and determining a dangerous rock falling risk evaluation grade; 3, quantifying or correcting an evaluation index parameter, namely, normalizing and scalarizing a qualitative index, and describing the qualitative index to a certain extent by using a numerical value form; 4, establishing a classical domain, a joint domain, a to-be-evaluated matter element and an extensible model of a to-be-evaluated dangerous rock matter element; 5, collecting to-be-evaluated dangerous rock data, determining a weight of each risk evaluation index by adoption of a single correlation function method, and calculating a correlation function value of the to-be-evaluated dangerous rock matter element; and 6, evaluating the dangerous rock falling risk, and calculating a grade variable feature value of the to-be-evaluated matter element so as to obtain a collapse rock falling risk grade of a to-be-evaluated dangerous rock at a portal section of a tunnel.

Description

technical field [0001] The invention relates to a multi-index extension evaluation method for dangerous rockfall risk in tunnels and underground engineering. Background technique [0002] With the national "Twelfth Five-Year Plan" and other strategic technological development plans, tunnels and underground engineering involving traffic engineering (railways, highway tunnels), water conservancy and hydropower engineering (water transmission tunnels, underground powerhouses) and a series of important engineering fields have become national major projects. It is an important part of infrastructure engineering construction, and the center of gravity of major engineering construction is gradually shifting to the western mountainous area with extremely complex topography and geology. The collapse of dangerous rock mass on the slope is a major geological disaster in tunnel construction. The sides and upside slopes of many tunnel entrances and exits in the western mountainous area a...

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Problems solved by technology

[0003] However, the current research work of domestic scholars on risk analysis and assessment is basically in the stage of exploration and development. In the process of risk assessment, the complexity and uncertainty of underground engineering geological conditions are often ignored, and most assessment methods can only give Qualitative or semi-quantitative analysis results cannot give the probability of occurrence corresponding to the disaster level

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