Numerical Simulation Study of the Effect of Fine View Pore Structure on Rock Burst

Round 1

Reviewer 1 Report

This manuscript discusses coal burst factors and simulation using numerical modeling for studying porosity, and pore size on uniaxial compressive strength. The manuscript needs to be improved before it can be processed further into the publication system. The authors need to work on the novelty part of the manuscript as this is very slim if not none. Also, the results need validation. Consider my comments on different sections of the manuscripts in the attached file. 

 

Comments for author File: Comments.pdf

Author Response

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Author Response File: Author Response.pdf

Reviewer 2 Report

In recent years, more and more attention has been paid in the world to solving the fundamental problem associated with conducting theoretical and experimental studies of the processes of deformation and destruction of coal rocks, as well as with the development of new methods for predicting and preventing man-made disasters in coal mining. During mining, coal is usually affected by impact and abrasion. Therefore, an important and urgent task is to study issues related to the influence of the porous structure of coal rock on its impact mechanical properties. The solution of this problem should be carried out using modern software tools that allow modeling the parameters of the porous structure. In the article, the authors analyzed the effect of porosity and pore size on various physical and mechanical properties of coal rocks in the course of numerical simulation. The results obtained in the work will be of interest to specialists in the field under consideration.

 However, it would be necessary to clarify a number of comments that are available to the article:

1. It would be necessary to characterize the phenomenon of destabilization shown in Figure 4 in more detail. The explanation given about the obviousness of its occurrence is not supported by numerical data.

2. Figure 5, b does not show mathematical models for calculating and predicting the studied parameters by analogy with Figure 5, a. To what extent can the given dependences in Figure 5 be used in the analysis of similar porous structures in various climatic conditions?

3. It is not entirely clear from the article whether cluster analysis was used to determine the mathematical relationship between the characteristics of the porous structure and the compressive strength? Why is the relationship between compressive strength and pore size (Figure 6) obtained from expression (1). How is the use of expression (1) justified?

4. The article should have dwelled in more detail on the analysis of Figure 8, which characterizes the effect of uniaxial compressive strength.

5. Is it possible to change the pore size in a wider range than shown in table 3?

6. The article should dwell in more detail on testing the results obtained on a specific object and the possibility of using the developed numerous models for similar objects.

Author Response

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Author Response File: Author Response.docx

Round 2

Reviewer 1 Report

The paper has been modified greatly as per my comments. The authors can proofread the paper to eliminate any other errors.