Determination method of rock uniaxial compressive strength empirical formula

Abstract

The invention discloses a determination method of a rock uniaxial compressive strength empirical formula. The method comprises the following steps: firstly, collecting an L-shaped Schmidt hammer rebound value and rock uniaxial compressive strength experimental data; and then, achieving chromosome sequence hybridization and variation composed of mathematical symbols, fitting coefficients and L-type Schmidt hammer springback values through a genetic expression algorithm, and determining whether the gene sequences are eliminated or not according to the adaptive value of each chromosome gene sequence, therefore, an empirical formula which can best represent the L-shaped Schmidt hammer rebound value and the rock uniaxial compressive strength is continuously iterated. The method overcomes the subjectivity in the determination process of a traditional empirical formula, and the determined empirical formula can be suitable for determining the uniaxial compressive strength of the rock and is wide in application range.

Description

technical field [0001] The invention discloses a method for determining an empirical formula of rock uniaxial compressive strength. Background technique [0002] The uniaxial compressive strength of rock is a common parameter of rock, but the traditional method of obtaining the uniaxial compressive strength of rock needs to prepare a complete rock sample, and then use a testing machine to perform a uniaxial compression test on the prepared cylindrical rock test to calculate Get the uniaxial compressive strength of the rock. The traditional method of obtaining the uniaxial compressive strength of rock requires good rock integrity. For brittle rocks and fractures, it is difficult to prepare complete rock samples, and the economic cost of obtaining the uniaxial compressive strength of rock is relatively high. Therefore, it has become one of the effective methods to obtain the uniaxial compressive strength of rock by indirect method, and it is an effective method to obtain the ...

AI Technical Summary

Problems solved by technology

The traditional method of obtaining uniaxial compressive strength of rock requires good rock integrity. For brittle rocks and fractures, it is difficult to prepare complete rock samples, and the traditional method of obtaining uniaxial compressive strength of rock is relatively expensive.

Therefore, it has become one of the effective methods to obtain the uniaxial compressive strength of rock by indirect method, and it is an effective method to obtain the uniaxial compressive strength of rock indirectly by L-shaped Schmidt hammer. Empirical formulas for L-type Schmidt hammer rebound value and rock uniaxial compressive strength, but these empirical formulas have certain subjectivity, and the amount of test data is small, so the empirical formulas obtained cannot fully reflect the L-type of different rocks. The relationship between the rebound value of Schmidt hammer and the uniaxial compressive strength of rock

Images