Rock mass quality non-linear fuzzy classification method

Abstract

The invention discloses a rock mass quality non-linear fuzzy classification method. The method includes: firstly, determining single-factor types according to a construction method: saturated uniaxialcompressive strength, rock quality designation, discontinuity spacing, discontinuity state coefficient and underground water; secondly, determining final evaluation categories and corresponding single-factor categories, and dividing the rock mass quality into I-V levels; thirdly, making single-factor evaluations, and determining a fuzzy relation matrix: generalizing and analyzing a membership function, selecting an S-shaped segmented curve, calculating the grade of membership of each level, and accomplishing the single-factor evaluations; fourthly, performing modeling by employing an analytichierarchy process: 1) establishing a hierarchical structural model; 2) constructing all discrimination matrixes of all hierarchies; 3) performing hierarchical single ranking and consistence examination; and 4) performing hierarchical total ranking and consistence examination; and fifthly, performing comprehensive evaluation. According to the method, based on existed related theories and practicalachievements, the analytic hierarchy process and the fuzzy evaluation method are introduced to the rock mass quality classification for rock mass quality non-linear fuzzy evaluation and classification.

Description

technical field [0001] The invention relates to a rock mass quality classification method, in particular to a rock mass quality nonlinear fuzzy classification method. Background technique [0002] The classification methods of rock mass quality are divided into single-element method and multi-element method. ) classification, rock mass basic quality classification (BQ classification), etc. [0003] At present, the multi-element method is mainly used to classify rock mass quality at home and abroad. The multi-element method quantifies and scores various basic elements of rock mass through geological survey, and comprehensively calculates the corresponding indicators according to the formula, so as to classify the quality category of rock mass and guide engineering design. The basic elements involved in the classification of rock mass quality can be roughly divided into three categories: one is the elements related to lithology, such as saturated uniaxial compressive strengt...

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Problems solved by technology

However, there are often two problems in practical engineering applications: one is that in the early stage of the project, because the geological work has not been carried out or completed, and there is a lack of relatively complete survey data, some basic elements cannot be quantified and scored as a single value; Due to the complexity of geological problems, the statistics or test results of different parts are often not the same, or even quite different, which leads to the quantitative score of the basic elements of rock mass usually being a range of values, and different values ​​within this range, the calculation The resulting grading may also vary

Therefore, even if the difference between the value results at both ends of the boundary is small, the obtained scores are very different, which may directly lead to the difference in grading results, which is unreasonable in actual engineering

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