scholarly journals Investigation of the suitable dimensions for hydraulic prop support of self-advancing hydraulic roof support in underground mining at Quang Ninh coal basin in Viet Nam

2021 ◽  
Vol 1753 (1) ◽  
pp. 012018
Author(s):  
Yu V Lykov ◽  
Bui Thanh Nhu ◽  
Do Duc Trong ◽  
Le Van Tung
Keyword(s):  
Underground Mining ◽  
Viet Nam ◽  
Coal Basin ◽  
Hydraulic Prop ◽  
Quang Ninh ◽  
Roof Support

scholarly journals A novel approach of determining the parameters of Asadi profiling function for predictiong ground subsidence due to inclied coal seam mining at Quang Ninh coal basin

2020 ◽  
Vol 61 (2) ◽  
pp. 86-95
Author(s):  
Long Quoc Nguyen ◽  
Keyword(s):  
Underground Mining ◽  
Mean Absolute Error ◽  
Absolute Error ◽  
Ground Subsidence ◽  
Coal Basin ◽  
Novel Approach ◽  
Maximum Subsidence ◽  
Seam Mining ◽  
Subsidence Monitoring ◽  
Quang Ninh

In this paper, we proposed a novel approach for estimating preliminary values of parameters of the Asadi profiling function (APF), then the least-squares principle was used with these preliminary values and ground subsidence monitoring data at the Thong Nhat underground mine to determine to the final parameters of the APF. This function was employed to predict ground subsidence at the Mong Duong mine where there are geological and rock geomachenial conditions well as seams’ inclination similar to those of Thong Nhat mine. The results show that the Rood Mean Square Error (RMSE) and Mean Absolute Error (MAE) equal to 0.081 m and 0.055 m or 9.9% and 6.7% of maximum subsidence, respectively, and a correlation coefficient of 0.973. These results prove that the APF with calculated parameters can be used to predict ground subsidence due to underground mining in the areas that have the similar conditions to Thong Nhat mine.

scholarly journals Ecological Risks in the Coal Mining in Tuva

2020 ◽  
Vol 17 (3) ◽  
pp. 16-29
Author(s):  
V. I. Zabelin ◽  
S. O. Ondar
Keyword(s):  
Coal Mining ◽  
Underground Mining ◽  
Noise Pollution ◽  
Ecological Risks ◽  
State University ◽  
Coal Basin ◽  
Treatment Facilities ◽  
Spontaneous Combustion Of Coal ◽  
Mandatory Use ◽  
Made In

The problems of ecological risks and technogenic hazards in the coal mining in Tuva based on the materials of geoecological research of the Tuva Institute for the Integrated Development of Natural Resources of the SB RAS and Tuva State University in 2015—2019 are considered. The results of coal analyzes of two typical coal mining of the Ulug-Khem coal basin with open and underground mining are presented, and the danger of dust and noise pollution of nearby pastures, catastrophic pollution of coal from the spawning of the Elegest spawning river, fires due to spontaneous combustion of coal are emphasized. There is possible influence of trace elements of coal — heavy metals, arsenic, mercury, etc. on the environment. Recommendations on improving the design and organization of coal mining enterprises, in particular on the placement of dumps and reclamation of their surface, as well as on the mandatory use of treatment facilities are made in the article.

Evaluation of dangerous methane and necessity for degassing in the mines of the Quang Ninh coal basin of Vietnam

2019 ◽  
Vol 5 (10) ◽  
pp. 20-25
Author(s):  
Phan Tuan Anh ◽  
◽  
K.S. Kolikov ◽  
Pham Duc Thang ◽  
◽  
...  
Keyword(s):  
Coal Basin ◽  
Quang Ninh

Gương mặt lãnh đạo mới của Việt Nam : ông Phạm Minh Chính, Thủ tướng Chính phủ

2021 ◽  
Author(s):  
H.L. Cu Si
Keyword(s):  
Viet Nam ◽  
Quang Ninh

Một người vừa có một cái sự chín chắn thông qua một chiến sĩ tình báo, vừa có cả kinh nghiệm về dân sự khi làm Bí thư Quảng Ninh, một tỉnh vừa có biển, vừa có núi lại còn có cửa khẩu, rất đặc thù, có đầy đủ những cái yếu tố của Việt Nam ở trong một cái tỉnh như thế, thì nào phải ngẫu nhiên nhiều ý kiến nhận định tin tưởng, “MỘT NGƯỜI VỪA CÓ KỸ TRỊ, VỪA CÓ NHÂN TRỊ, THÌ DÙ Ở BẤT CỨ CƯƠNG VỊ NÀO CŨNG DỐC LÒNG PHỤNG SỰ”.

scholarly journals Operational Tests of a Modular Installation and Transport Assembly of Steel Arch Support in Underground Excavations

2021 ◽  
Vol 4 (1) ◽  
pp. 343-354
Author(s):  
Krzysztof Krauze ◽  
Kamil Mucha ◽  
Tomasz Wydro ◽  
Andrzej Kutnik ◽  
Waldemar Hałas ◽  
...  
Keyword(s):  
Underground Mining ◽  
Underground Mines ◽  
Mining Machine ◽  
Wide Range ◽  
Innovative Solution ◽  
The Face ◽  
Continuous Mining ◽  
Range Of Functions ◽  
Arch Support ◽  
Roof Support

Abstract The roof support, especially the ŁP yielding steel arch support, is transported and assembled in the face with the use of auxiliary machines. This activity in Polish underground mines causes numerous problems, which until present have not been solved. Currently, transport and assembly are carried out manually, while the roadheader and suspended rail are used only to a small extent. Therefore, the modular installation and transport assembly was developed jointly by FAMA Sp. z o. o. and AGH University of Science and Technology. The solution in question enables performing a number of functions (including transport and assembly of all kinds of support arches), which are not available in currently manufactured equipment. The proposed manipulator solves numerous problems occurring during the installation of the steel arch support in an underground mining excavation and significantly improves the process of drilling galleries. This innovative solution considerably differs from the existing ones, and its greatest advantage is versatility with regard to the cross-section and equipment of the roadway, as well as a wide range of functions. In addition, it can also be used for reloading works. The modular installation and transport assembly together with a platform, a temporary mechanized roof support and a mining machine, make up a mechanizes roadheader complex, which enables continuous mining, loading and installing the permanent support in underground workings.

scholarly journals MONITORING OF THE UNDERMINED TERRITORIES OF KARAGANDA COAL BASIN ON THE BASIS OF SATELLITE RADAR INTERFEROMETRY

2016 ◽  
Vol III-6 ◽  
pp. 37-40
Author(s):  
S. B. Ozhigina ◽  
D. V. Mozer ◽  
D. S Ozhigin ◽  
S. G. Ozhigin ◽  
O. G. Bessimbayeva ◽  
...  
Keyword(s):  
Rock Mass ◽  
Underground Mining ◽  
Integrated Approach ◽  
Radar Interferometry ◽  
Coal Basin ◽  
Mining Operations ◽  
Mining Areas ◽  
Close Proximity ◽  
Satellite Radar ◽  
Karaganda Coal

In the Karaganda coal basin, mines are located in close proximity to each other and to the city of Karaganda and ongoing mining operations are accompanied by a dangerous process of settling the earth's surface and monitoring are essential for the region's econ-omy. Underground mining leads to the formation of voids in the rock mass, which cause displacement of the earth surface. This paper demonstrates an innovative use of the integrated approach for monitoring on the example of Karaganda coal basin, which includes estimation of the rock mass displacement using leveling profile lines and satellite radar interferometry. It is proved that satellite radar interferometry provides reliable results of surface subsidence measurements in mining areas and can be used for con-sidered sort of monitoring.

scholarly journals HIỆN TRẠNG THẢM THỰC VẬT NGẬP MẶN XÃ ĐỒNG RUI, HUYỆN TIÊN YÊN, TỈNH QUẢNG NINH

2018 ◽  
Vol 34 (3) ◽  
Author(s):  
Hanh Nguyen
Keyword(s):  
Viet Nam ◽  
Kandelia Obovata ◽  
Bruguiera Gymnorrhiza ◽  
Rhizophora Stylosa ◽  
Quang Ninh

Các phương pháp điều tra thực địa, phân tích ảnh vệ tính, thiết bị bay không người lái đã được sử dụng để nghiên cứu, đánh giá hiện trạng thảm thực vật rừng ngập mặn xã Đồng Rui, huyện Tiên Yên, tỉnh Quảng Ninh và xây dựng bản đồ phân bố các kiểu quần xã thực vật rừng ngập mặn. Tổng số 145 loài thực vật thuộc 116 chi, 55 họ và hai ngành thực vật có mạch, gồm Dương xỉ (Polypodiophyta) và Ngọc lan (Magnoliophyta) đã được ghi nhận ở rừng ngập mặn xã Đồng Rui. Trong đó có 16 loài thuộc nhóm cây ngập mặn thực sự. Các loài Trang (Kandelia obovata), Đâng (Rhizophora. stylosa), Vẹt dù (Bruguiera gymnorrhiza), Mắm (Avicennia spp.) Sú (A. corniculatum), là nhóm loài ưu thế. Kết quả nghiên cứu đã ghi nhận hai loài sẽ nguy cấp và nguy cấp được ghi trong Sách đỏ Việt Nam là Hà thủ ô đỏ (Fallopia multiflora) và Cỏ ngạn (Scirpus kimsonensis). Khoảng 87,6% tổng số loài có công dụng, chủ yếu được sử dụng làm dược liệu và làm thức ăn. Đã xác định  và xây dựng bản đồ phân bố của 14 quần xã thực vật thuộc thảm thực vật rừng ngập mặn xã Đồng Rui.

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