Study on Denoising Method of Vibration Signal Induced by Tunnel Portal Blasting Based on WOA-VMD Algorithm

Round 1

Reviewer 1 Report

This work is certainly interesting and has important potential consequences. But the manuscript needs the following modifications:

1.      Some abbreviations such as “WOA, VMD and CEEMDAN” appear in the abstract without prior declaration of their meaning at their first appearance. Also, CEEMD and CEEMDAN appear in the manuscript at introduction section without prior declaration of their meaning at their first appearance

2.      Line 239: “which are the main cause of signal distortion and distortion.”, it is recommended to eliminate “and distortion” or rewrite the phrase to be clearer.

3.      Lines 240-241: “The signal dominant frequency the before and after noise …”, authors recommended to modify the phrase as “The signal dominant frequency before and after noise …”.

4.      Line 257: Authors recommended to modify the repeated declaration of measured signals “S2” to “S3” in Fig. 6.

5.      Also, optionally in Fig. 6, it is recommended to add the declaration of each measured signals beside the algorithms’ abbreviations in the sub-figures such as “S1-CEEMDAN, S1-VMD, …”.

6.      Line 278: It is recommended to replace “&” by “and”.

Author Response

Dear Reviewer:

Thank you for your letter and for the reviewers’ comments concerning our manuscript entitled “Study on denoising method of vibration signal induced by tunnel portal blasting based on WOA-VMD algorithm” (ID: applsci-2233921). Those comments are all valuable and very helpful for revising and improving our paper, as well as the important guiding significance to our researches. We have studied comments carefully and have made correction which we hope meet with approval. Revised portion are marked in red in the paper. The main corrections in the paper and the responds to the reviewer’s comments are as follows:

(1) Some abbreviations such as “WOA, VMD and CEEMDAN” appear in the abstract without prior declaration of their meaning at their first appearance. Also, CEEMD and CEEMDAN appear in the manuscript at introduction section without prior declaration of their meaning at their first appearance

Response: Thanks the reviewer for pointing out the mistake. The prior declaration is added where the abbreviation first appears.

(2) Line 239: “which are the main cause of signal distortion and distortion.”, it is recommended to eliminate “and distortion” or rewrite the phrase to be clearer.

Response: There is a clerical error error and we have modified it in the paper.

(3) Lines 240-241: “The signal dominant frequency the before and after noise …”, authors recommended to modify the phrase as “The signal dominant frequency before and after noise …”.

Response: Thanks the reviewer for pointing out the mistake and we have modified it in the paper.

(4)Line 257: Authors recommended to modify the repeated declaration of measured signals “S2” to “S3” in Fig. 6.

Response: We have modified it in Fig. 6.

(5) Also, optionally in Fig. 6, it is recommended to add the declaration of each measured signals beside the algorithms’ abbreviations in the sub-figures such as “S1-CEEMDAN, S1-VMD, …”.

Response: We have modified it in Fig. 6.

(6) Line 278: It is recommended to replace “&” by “and”.

Response: We have modified it in Line 278.

Sincerely thanks for your good comments to our manuscript.

We tried our best to improve the manuscript and made some changes in the manuscript. These changes will not influence the contents and framework of the paper. And here we did not list the changes but marked in red in revised paper.

We appreciate for Reviewers’ warm work earnestly, and hope that the correction will meet with approval.

Once again, thank you very much for your comments and suggestions.

Yours sincerely,

Corresponding author, Yaxiong Peng

Reviewer 2 Report

Dear Authors

Interesting draft for the signal analysis. Some comments to introduce some details on practical engineering aspectes of blasting close to tunnel portals are reported in the following recommendations.

Thanks and Regards

 

1) in caption of fig 1 write also extension of VMD and WOA

 

2) MPE at line 139 needs also extension in words

3) at lines 142, 147 and 151 it is necessary to introduce a simple explanation of the meaning of those actions and the obtained results after processing

4) explain better caption of fig.2 . In Y axis do we have peak particle velocity measured by the sensors? Similar for fig.6 spectrum.

5) line 183: where has been installed sensor? On the rock outcrop, on the concrete lining, on the road paving?

6) do we have superimposition of different blasts? What are the units in X axis and Y axis? In other words, how many detonator delays have been introduced in the blasting sequence? This information can help filtering and denoising of signals.

7) what is “original signal” in table 1?

8) Table 2: unit of measure?

9) Any monitoring of portal of stability or displacement during blasting controls? Any particular care for profile control during blastholes preparation? This is relevant to compare initial blasting energy and percentage of energy that reaches the portal.

10) In Conclusions, mention if values of vibration are under or over the accepted limits for the stability of the portal.

11) Three references that can be easily considered:

a) For monitoring and control of portals:

Reinforcement design and control of rock slopes above tunnel portals in northern Italy

Del Greco O. et al.

International Journal of Rock Mechanics and Mining SciencesVolume 41, Issue SUPPL. 1, Pages 3B 02 1-6May 2004

DOI

10.1016/j.ijrmms.2004.03.136

b) For classical index of damage for lining and portals:

Yu, T.R., Vongpaisal, S.

New blast damage criteria for underground blasting

(1996) CIM Bulletin, 89 (998), pp. X1-145

c) For the preparation of blast schemes:

 Open access

Damage and contour quality in rock excavations for quarrying and tunnelling: Assessment for properties and solutions for stability

Costamagna, E. et al.

IOP Conference Series: Earth and Environmental Science, 2021, 833(1), 012137

DOI 10.1088/1755-1315/833/1/012137

 

Author Response

Dear Reviewer:

Thank you for your letter and for the reviewers’ comments concerning our manuscript entitled “Study on denoising method of vibration signal induced by tunnel portal blasting based on WOA-VMD algorithm” (ID: applsci-2233921). Those comments are all valuable and very helpful for revising and improving our paper, as well as the important guiding significance to our researches. We have studied comments carefully and have made correction which we hope meet with approval. Revised portion are marked in red in the paper. The main corrections in the paper and the responds to the reviewer’s comments are as follows:

(1) in caption of fig 1 write also extension of VMD and WOA

Response: Thanks the reviewer for pointing out the mistake and we have modified the caption of fig. 1.

(2) MPE at line 139 needs also extension in words

Response: We added the extension content of MPE at line 139

(3) at lines 142, 147 and 151 it is necessary to introduce a simple explanation of the meaning of those actions and the obtained results after processing

Response: In order to explain the calculation process more clearly, a simple explanation has been added in Section 3.2.

(4) explain better caption of fig.2 . In Y axis do we have peak particle velocity measured by the sensors? Similar for fig.6 spectrum.

Response: The Y axis represents particle vibration velocity, which is directly obtained by the sensors. We added the corresponding explanation in the paper.

(5) line 183: where has been installed sensor? On the rock outcrop, on the concrete lining, on the road paving?

Response: Blasting vibration monitoring sensors are usually arranged on rock outcrop in the shallow buried section of tunnel portal. We added a note in Section 4.1.

(6) do we have superimposition of different blasts? What are the units in X axis and Y axis? In other words, how many detonator delays have been introduced in the blasting sequence? This information can help filtering and denoising of signals.

Response: It is true that the seismic waves generated by blasting in different detonator delays are superimposed. We add the introduction of the blasting delay parameters, and the positions of each delays are roughly marked in Figure 2.

(7) what is “original signal” in table 1?

Response: Original signal refers to the signal s1 that has not been denoised. We have modified Table 1

(8) Table 2: unit of measure?

Response: MPE is a dimensionless number and therefore has no units.

(9) Any monitoring of portal of stability or displacement during blasting controls? Any particular care for profile control during blastholes preparation? This is relevant to compare initial blasting energy and percentage of energy that reaches the portal.

Response: The smooth blasting method is used to excavate the tunnel, and the displacement and blasting vibration of the tunnel entrance are monitored. We added a note in Section 4.1.

(10) In Conclusions, mention if values of vibration are under or over the accepted limits for the stability of the portal.

Response: We add the corresponding description to the conclusion.

(11) Three references that can be easily considered:

1. a) For monitoring and control of portals:

Reinforcement design and control of rock slopes above tunnel portals in northern Italy

Del Greco O. et al. International Journal of Rock Mechanics and Mining Sciences Volume 41, Issue SUPPL. 1, Pages 3B 02 1-6May 2004 DOI 10.1016/j.ijrmms.2004.03.136

1. b) For classical index of damage for lining and portals:

Yu, T.R., Vongpaisal, S. New blast damage criteria for underground blasting (1996) CIM Bulletin, 89 (998), pp. X1-145

1. c) For the preparation of blast schemes:

Open access Damage and contour quality in rock excavations for quarrying and tunnelling: Assessment for properties and solutions for stability Costamagna, E. et al. IOP Conference Series: Earth and Environmental Science, 2021, 833(1), 012137 DOI 10.1088/1755-1315/833/1/012137

Response: Thanks to the expert advice, we add these several literatures.

Sincerely thanks for your good comments to our manuscript.

We tried our best to improve the manuscript and made some changes in the manuscript. These changes will not influence the contents and framework of the paper. And here we did not list the changes but marked in red in revised paper.

We appreciate for Reviewers’ warm work earnestly, and hope that the correction will meet with approval.

Once again, thank you very much for your comments and suggestions.

Yours sincerely,

Corresponding author, Yaxiong Peng

Reviewer 3 Report

To verify noise reduction effects, this study uses the Whale Optimization Algorithm (WOA) to optimize vibration mode decomposition (VMD) parameters.

Before MDPI publishes the work, the authors would have to make a few minor corrections to the report and content. My comments are as follows:

1. There should be an explanation of what WOA and VMD stand for as well as the abbreviations in brackets (Abstract).

2. Starting a sentence with an abbreviation is not good writing practice. Make sure this is corrected throughout this manuscript.

3. It would be useful if the authors reported an estimate of noise reduction coefficients based on WOA as well as comparing it with literature data.

Author Response

Dear Reviewer:

Thank you for your letter and for the reviewers’ comments concerning our manuscript entitled “Study on denoising method of vibration signal induced by tunnel portal blasting based on WOA-VMD algorithm” (ID: applsci-2233921). Those comments are all valuable and very helpful for revising and improving our paper, as well as the important guiding significance to our researches. We have studied comments carefully and have made correction which we hope meet with approval. Revised portion are marked in red in the paper. The main corrections in the paper and the responds to the reviewer’s comments are as follows:

(1) There should be an explanation of what WOA and VMD stand for as well as the abbreviations in brackets (Abstract).

Response: Thanks the reviewer for pointing out it. The explanation of what WOA and VMD is added in section of ‘Abstract’.

(2) Starting a sentence with an abbreviation is not good writing practice. Make sure this is corrected throughout this manuscript.

Response: Thanks to expert advice, we made revisions throughout the manuscript.

(3) It would be useful if the authors reported an estimate of noise reduction coefficients based on WOA as well as comparing it with literature data.

Response: In this paper, signal to noise ratios and root mean square error are used as the evaluation index of noise reduction effect. The difference of signal noise reduction effect of different methods of CEEMDAN, VMD and WOA-VMD is compared and analyzed and the effectiveness of the proposed method in paper is verified. Because it is difficult to obtain accurate time-amplitude data of blasting signal from other literatures. Therefore, we did not conduct a comparative analysis using literature data

Sincerely thanks for your good comments to our manuscript.

We tried our best to improve the manuscript and made some changes in the manuscript. These changes will not influence the contents and framework of the paper. And here we did not list the changes but marked in red in revised paper.

We appreciate for Reviewers’ warm work earnestly, and hope that the correction will meet with approval.

Once again, thank you very much for your comments and suggestions.

Yours sincerely,

Corresponding author, Yaxiong Peng