Fuzzy matter element evaluation method for cavability of rock

Abstract

The invention discloses a fuzzy matter element evaluation method for the cavability of a rock. According to the method, fuzzy mathematics is organically combined with matter element analysis together, the cavability of the rock is divided into five grades of no cavability, poor cavability, better cavability, good cavability and excellent cavability as matter elements, an RQD (rock quality designation) value, uniaxial saturated compressive strength, a joint spacing, a primary undermining hydraulic radius and a water characteristic value are selected as evaluation indexes. Through membership grade calculation, correlation degree transformation and preferred membership grade treatment, a correlation coefficient fuzzy matter element for evaluating the cavability of the rock is established. An evaluation index weight is determined by adopting a summation normalization method, the membership grades, relative to different evaluation levels, of each index quantity of the rock are calculated by applying correlation degree calculation and a maximum correlation degree principle, further the membership grade evaluation is carried out on the cavability of the rock, and the problem that a single-factor index and the evaluation of the cavabiliyt of the rock are incompatible is solved. An important reference basis is provided for the evaluation of the cavability of the rock at a mine and the design of a mining method in a spontaneous caving method.

Description

technical field [0001] The invention belongs to the technical field of mining engineering, and relates to a novel evaluation method for the caving property of ore and rock in a natural caving method. Background technique [0002] The collapsibility of ore rock is an important indicator to measure whether the natural caving method is applicable. It is important for the mining design's mining sequence, bottom-drawing direction, bottom-drawing area, ore-out method, ore-drawing control, side-cutting and pre-cracking, safe production and technical and economic indicators. etc. have a decisive influence. Among them, R. Kendrick found that there is an obvious linear relationship between the rock quality index (RQD) and the collapsibility when evaluating the collapsibility of Climax and Urad mines, so he proposed the collapsibility index evaluation method. E.T.Brown and G.A.Ferguson proposed the RQD value classification method after joint strength correction; D.H.Laubscher proposed...

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Problems solved by technology

For example, Zhang Zhiwen proposed a fuzzy mathematical evaluation method for ore body collapsibility, which solved the problem that the traditional evaluation method cannot reflect the gradual change process of ore rock properties.

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