A method for determining the number of statistical samples of rock mass structural plane roughness based on the analysis of coefficient of variation grade ratio

Abstract

A method for determining the number of statistical samples of rock mass structural plane roughness based on the analysis of coefficient of variation grade ratio is disclosed. When the average values of each data group are the same, Generally speaking, standard deviation is used to express data dispersion, but because the average values of roughness coefficients are not identical in each group, theratio of standard deviation to average value, or coefficient of variation, is used to express data dispersion, which is denoted as CV, and the influence of different units and averages on the comparison of two or more data variability can be eliminated. Stage ratio analysis can reflect the dispersion of data and the fluctuation of adjacent data concisely. The coefficient of variation CV corresponding to the number of samples is calculated. When the coefficient of variation CV tends to be stable, the number of samples is enough to meet the requirements of the accuracy of the calculation results. The coefficients of variation of each group were analyzed based on the rank ratio analysis method, and the corresponding rank ratio coefficients were calculated. The invention is suitable for determining the minimum sample number of different sample sizes, and is suitable for engineering application and simple and efficient.

Description

technical field [0001] The invention belongs to the field of engineering technology, and relates to a method for determining the statistical sample number of rock mass structural surface roughness based on variation coefficient grade ratio analysis. The method of statistically measuring the number of samples for structural surface roughness solves the problem that it was difficult to determine the required effective number of samples when collecting samples in the past, and ensures the reliability of JRC measurement results. Background technique [0002] Structural plane is the weak link in rock mass, and it is a sign of geological structure with certain shape and ubiquity. Through the statistical measurement of the roughness of the rock mass structural surface, the nature and characteristics of the rock mass structural surface roughness can be fully understood. The invention is mainly applied to determine the minimum number of samples satisfying the statistical measurement...

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Problems solved by technology

[0010] In order to overcome the deficiency that the quantitative determination method for the number of statistical samples of rock mass structural surface roughness cannot meet the needs of engineering, in order to ensure the accuracy of the statistical results of rock mass structural surface roughness coefficient, it is necessary to ensure that the number of analysis samples is large enough, but the sample The problem with the large number is the increase in the amount of measurement and calculation, and it takes a lot of time and effort

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