Fuzzy comprehensive evaluation method of geological strength index

A technology of geological strength index and determination method, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as hindering the universal application of geological strength index system, uncertainty, ambiguity, etc.

Inactive Publication Date: 2013-03-20
BEIJING JIAOTONG UNIV +1
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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

Method used

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  • Fuzzy comprehensive evaluation method of geological strength index
  • Fuzzy comprehensive evaluation method of geological strength index
  • Fuzzy comprehensive evaluation method of geological strength index

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Embodiment Construction

[0055] The method for determining the quantification of the geological strength index of the present invention will be described below with reference to the accompanying drawings. The method includes the following steps:

[0056] (1) Combined with the value table of geological strength indicators (see figure 1 ), introduce the number of rock mass joint groups, joint spacing and rock mass integrity coefficient to describe rock mass structural characteristics, and introduce large-scale waveform coefficient (see figure 2 ), small scale smoothness coefficient (see image 3 ) And joint alteration coefficients describe the conditions of the structural plane. According to the fuzziness, hierarchy and difference of the six evaluation indexes on the value of the geological strength index, a set of fuzzy comprehensive evaluation factors is established:

[0057] U 1 ={u 11 , U 12 , U 13 }

[0058] U 2 ={u 21 , U 22 , U 23 }

[0059] Where: U 1 Is a feature set of rock mass structure; U 2 Is a s...

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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 ...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 曹瑞琅朱江贺少辉陈庆才
Owner BEIJING JIAOTONG UNIV
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