- Tytuł:
- Stabilization of Deep Roadways in Weak Rocks Using the System of Two-level Rock Bolts
- Autorzy:
-
Tran, Tuan Minh
Do, Ngoc Thai
Dang, Trung Thanh
Nguyen, Duyen Phong
Vo, Trong Hung - Powiązania:
- https://bibliotekanauki.pl/articles/2019328.pdf
- Data publikacji:
- 2021
- Wydawca:
- Polskie Towarzystwo Przeróbki Kopalin
- Tematy:
-
deep roadways
large deformation mechanism
control techniques
numerical simulation
weak rocks
rock bolts
odkształcenia
symulacja numeryczna
kotwie górnicze - Opis:
- Large rock mass deformation around deep roadways in the weak rocks was a significant problem in mining activities in Vietnam and other countries. The excavation of roadways leads to high releasing stress, which exceeds the peak strength of spalling surrounding rock and causes it to enter the post-failure stage. Tensile failures then initiate and develop around the roadways, which causes the fragmentation, dilation, and separation of surrounding rock. The capacity of the primary support system is low, which results in a severe contraction in the whole section of roadways, which requires finding solutions to prevent the deformation of rock mass around roadways and technical solutions from stabilizing for deep roadways. To stability analysis of roadways can be applied analytical, experimental, semi-experimental, and numerical methods. This paper introduces the prevention mechanism of large deformation of rock mass around roadways using 2-level rock bolts. The research results show that using the system of two-level rock bolts can reduce the values of tensile stress on the boundary of roadways range from 10 to 15% compared with only one. The importance of the total displacement of rock mass on the boundary of roadways will be reduced from 3.47 to 13.85% using six long cable bolts.
- Źródło:
-
Inżynieria Mineralna; 2021, 2; 157--166
1640-4920 - Pojawia się w:
- Inżynieria Mineralna
- Dostawca treści:
- Biblioteka Nauki
Artykuł