The Mining Engineering Institute under the Academy of Coal Science has developed an advanced method of pit perpetuation that can be applied to anthracite mines.
The method helps to reinforce the rock bed around the pit by fastening rock bolts, injecting cement slurry and lining shotcrete support so that it can support the pit.
The researchers made a deep study of the world trend and literature concerning pit maintenance techniques and the situation of anthracite mines in the country in order to perpetuate pits with a small amount of steel materials. Through such deep inquiry they chose the innovative plans to confirm the construction materials, means and methods.
Accordingly, they completed the binding structure of rock bolts with spiral fixing points and confirmed the relevant mechanical building and distribution method. They also developed rock bolt adhesives and invented hole filler, feeding pumps and other construction devices.
This method was applied to a 100-metres-long section of the February 8 Jiktong Youth Coal Mine on a trial basis and its scientific efficacy was proved through months of observation.
Encouraged by this success, they introduced the method to many other coal mines with good results this year.
The method helps to significantly cut the cost for main drift maintenance as it requires no timber and much less rolled steel compared with steel support.
Given that the main drift can be maintained for more than five years without repair after the introduction of the method, it can greatly save labour, materials and fund.
Currently, many anthracite mines are introducing the method.
Jo Son Hyok
More From Naenara (En)
The geo-section of Kat Peak is one of the geological sites in the Mt Paektu area registered as a global geopark. The peak is
July 03, 2025
The geo-section of Kat Peak is one of the geological sites in the Mt Paektu area registered as a global geopark. The peak is
The harvest of wheat and barley is underway in the rural areas across the DPRK. Around June the harvest of the early crops starts
July 03, 2025
The harvest of wheat and barley is underway in the rural areas across the DPRK. Around June the harvest of the early crops starts
The Chollima era is proudly etched in the course of development of the DPRK replete with creations and transformations. In the
July 03, 2025
The Chollima era is proudly etched in the course of development of the DPRK replete with creations and transformations. In the
A spectacular sight of laughter and optimism has been presented at the 4km-long sandy beach of the Wonsan Kalma Coastal Tourist
July 03, 2025
A spectacular sight of laughter and optimism has been presented at the 4km-long sandy beach of the Wonsan Kalma Coastal Tourist
Korea’s classic Tangunsegi is known to have been compiled by Ri Am in 1363. The book deals with typical events, facts, language,
July 03, 2025
Korea’s classic Tangunsegi is known to have been compiled by Ri Am in 1363. The book deals with typical events, facts, language,
A delegation of Kim Il Sung Military University headed by its President Kim Kum Chol left Pyongyang on June 30 to visit the
July 02, 2025
A delegation of Kim Il Sung Military University headed by its President Kim Kum Chol left Pyongyang on June 30 to visit the
Mt Kanbaek volcano is one of the geological sites in the Mt Paektu area registered as a global geopark. It is a volcano with an
July 02, 2025
Mt Kanbaek volcano is one of the geological sites in the Mt Paektu area registered as a global geopark. It is a volcano with an
Undertakings for improving conditions and environment for education are in full swing in the DPRK. Last year alone, after Songga
July 02, 2025
Undertakings for improving conditions and environment for education are in full swing in the DPRK. Last year alone, after Songga
The Paper Engineering Institute of the State Academy of Sciences has developed a technology of making paper by using fallen
July 02, 2025
The Paper Engineering Institute of the State Academy of Sciences has developed a technology of making paper by using fallen
The delegation of the Ministry of Culture of the Russian Federation headed by Minister Olga Lyubimova visited the Juche-oriented
July 02, 2025
The delegation of the Ministry of Culture of the Russian Federation headed by Minister Olga Lyubimova visited the Juche-oriented
Talks between Sung Jong Gyu, minister of Culture of the Democratic People's Republic of Korea, and Olga Lyubimova, minister of
July 01, 2025
Talks between Sung Jong Gyu, minister of Culture of the Democratic People's Republic of Korea, and Olga Lyubimova, minister of
A delegation of the Ministry of Culture of the Russian Federation led by Minister Olga Lyubimova on a visit to the DPRK laid a
July 01, 2025
A delegation of the Ministry of Culture of the Russian Federation led by Minister Olga Lyubimova on a visit to the DPRK laid a
The Chollima Steel Complex has newly installed an efficient and advanced curved continuous caster and put it into commission. As a
July 01, 2025
The Chollima Steel Complex has newly installed an efficient and advanced curved continuous caster and put it into commission. As a
Pyongyang Grand Theatre is one of the iconic structures in downtown Pyongyang. It is associated with the wise leadership of the
July 01, 2025
Pyongyang Grand Theatre is one of the iconic structures in downtown Pyongyang. It is associated with the wise leadership of the
Established in November 2004 and located in Mundok County, South Phyongan Province, the Chongnam Joint Venture Company engages in
June 30, 2025
Established in November 2004 and located in Mundok County, South Phyongan Province, the Chongnam Joint Venture Company engages in
Lately, the Hwanghae Iron and Steel Complex set up a new technical process for improving the quality of steel by using active
June 30, 2025
Lately, the Hwanghae Iron and Steel Complex set up a new technical process for improving the quality of steel by using active
The Chongnam building-materials manufactory under the Anju Area Coal-mining Complex has developed an ornamental tile made of
June 30, 2025
The Chongnam building-materials manufactory under the Anju Area Coal-mining Complex has developed an ornamental tile made of
At an invitation of the DPRK Ministry of Culture, a delegation of the Ministry of Culture of the Russian Federation headed by
June 30, 2025
At an invitation of the DPRK Ministry of Culture, a delegation of the Ministry of Culture of the Russian Federation headed by
Many scientists in the DPRK put their heart and soul into implementing the Regional Development 20x10 Policy of the Workers’ Party
June 29, 2025
Many scientists in the DPRK put their heart and soul into implementing the Regional Development 20x10 Policy of the Workers’ Party
Today the DPRK is greeting a new era of comprehensive rejuvenation. With the appearance changing day by day from downtown
June 29, 2025
Today the DPRK is greeting a new era of comprehensive rejuvenation. With the appearance changing day by day from downtown
More Articles
