Assessing the impact of underground working (tunneling) in the II section of Seam 14 on surface construction works at Ha Lam Coal Mine (Vietnam)

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Authors:


Tien Trung Vu, orcid.org/0000-0002-3725-2127, Hanoi University of Mining and Geology, Socialist Republic of Vietnam, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Doan Viet Dao, orcid.org/0000-0002-5586-7993, Hanoi University of Mining and Geology, Socialist Republic of Vietnam, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.


повний текст / full article



Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2022, (4): 039 - 044

https://doi.org/10.33271/nvngu/2022-4/039



Abstract:



Purpose.
Tunneling in the ground changes the initial equilibrium stress state of the rock, which is also the cause of displacement and deformation of the surrounding rock mass. To determine the impact of tunneling on surface construction works in order to ensure the safety of surface works by analyzing the displacements and deformations of the rock mass during tunneling in the IIsection of Seam 14 at Ha Lam Coal Mine.


Methodology.
To achieve the research results, actual field survey methods, data analysis and numerical modeling, as well as combined blasting vibration methods are used.


Findings.
After analyzing the numerical modeling results, an area has been identified in the II section of Seam 14 of the Ha Lam Coal Mine that affects the surface construction works and is located within a radius of about 20 m from the portal of two inclined shafts. The results of blasting vibrations are calculated on the basis of the passport of blasting operations in tunnels. Thus, the affected area has been identified within a radius of 30.5m. However, at a distance of 30.5 m, surface construction works are not in the area of influence.


Originality.
On the basis of FLAC software, the authors have developed a simulation model for tunneling, thereby analyzing and describing the best state of deformation and displacement of the surrounding rock mass. In this study, a numerical modeling method is applied to simulate the driving order for each tunnel, which is consistent with the actual production of underground mines. Based on the passport of drilling and blasting operations in tunnels, the authors calculated the impact of blasting vibrations on surface construction works. After that, the authors assessed and identified the affected area with the required degree of reliability.


Practical value.
The research results are used as a basis for implementation in actual production at Ha Lam Coal Mine. On the basis of analysis of the surrounding rock mass displacements and deformations, when tunneling in the II section of Seam 14 at Ha Lam Coal Mine, the affected area of the surface construction works has been determined. This is also the basis for Ha Lam Coal Mine when planning construction works on the site outside the determined affected areas to ensure the safety of such works.



Keywords:
tunnels, surface construction works, displacement, deformation, Ha Lam Coal Mine

References.


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