Fuzzy comprehensive evaluation method of geological strength index

Abstract

The invention relates to a fuzzy comprehensive evaluation method of a geological strength index, and the method is characterized in that a rock joint group number, a joint interval and a rock completeness coefficient are used for describing rock structural characteristics, a large proportional scale waveform coefficient, a small proportional scale smooth coefficient and a joint erosion coefficient are used for describing conditions of a structural plane, and a fuzzy comprehensive evaluation set is established according to the fuzziness, hierarchy and difference of the evaluation index influencing the geological strength index value; a membership function of rock material characteristics is constructed, and the weight of the evaluation factor is determined on the basis of the layering analysis method; and finally a rock structural characteristic and structural plane condition factor evaluation matrix is established according to the geological exploration result and the test data, and the value of the geological strength index is determined according to the maximal subordinate principle. The comprehensive evaluation method is strong in pertinence, high in accuracy, capable of reasonably combining the geological investigation result, the test result, statistical data and expert opinions, capable of reducing the subjectivity in decision-making of a researcher and easy to realize.

Description

Technical field [0001] The invention relates to tunnels and underground engineering, in particular to a fuzzy comprehensive evaluation method of geological strength indicators. Background technique [0002] The method for determining the fuzzy comprehensive evaluation of the geological strength index involved in the present invention has not been reported in the relevant patent literature. In the literature (①CAIM, KAISER PK, UNO H, et al. Estimate of rock mass deformation modulus and strength of jointed hard rockmasses using the GSI system. "International Journal of Rock Mechanics and Mining Sciences", 2004, 41: 3-19; ②RUSSO GA The new rational method for calculating the GSI. "Tunnelling and Underground Space Technology", 2009, 24(1): 103-111), although the concept of quantitative analysis of geological strength indicators is proposed, but the value of geological strength indicators is not specific. Mathematical quantitative method, and no fuzzy comprehensive evaluation method ...

AI Technical Summary

Problems solved by technology

Researchers rely on rich experience to make reasonable subjective judgments. This method is the premise of accurate value selection. Therefore, the value selection is prone to subjectivity and experience. The index value is relatively sensitive, and the existence of this problem will hinder the general application of the geological strength index system

[0004] Since the connotation of some indicators for evaluating rock mass quality is not completely clear, the identification process of these indicators is ambiguous and uncertain, which will inevitably lead to a certain degree of subjectivity in decision-making by researchers.

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