Feasibility Analysis on Implement of Freeze Roadway Cooling Technology in Coal Mine of Heilongjiang Province

2012 ◽  
Vol 204-208 ◽  
pp. 1830-1833
Author(s):  
Jing Zhou ◽  
Xi Ming Liu ◽  
Xian Li Qin ◽  
Shu Ren Xing
Keyword(s):  
Constant Temperature ◽  
Coal Mine ◽  
Soil Layer ◽  
Reference Value ◽  
Frozen Soil ◽  
Feasibility Analysis ◽  
Geological Condition ◽  
Heilongjiang Province ◽  
Geographical Position ◽  
Cooling Technology

Freeze roadway cooling technology is delivering cold quantity to cooling underground face by storage cooling energy in strata, and the effect of storaging cold is critical. The geographical position and geological condition of coal mine in Heilongjiang Province has remarkable characteristics. The feasibility of freeze roadway cooling measure was demonstrated on temperature, geothermal, constant temperature strata and frozen soil layer, etc. by analyzed its advantage adequately. The measure provides a new idea which suits the native situation for prevent the heat-harm in coal mine, it also has the realistic reference value and is worth popularizing.

scholarly journals Stress Distribution Around Mechanized Longwall Face at Deep Mining in Quang Ninh Underground Coal Mine

2021 ◽  
Vol 1 (2) ◽  
Author(s):  
Manh Tung BUI ◽  
Tien Dung LE ◽  
Trong Hung VO
Keyword(s):  
Stress Distribution ◽  
Sea Level ◽  
Coal Mine ◽  
Coal Mines ◽  
Longwall Face ◽  
Geological Condition ◽  
Deep Mining ◽  
Roof Fall ◽  
The Impact ◽  
Quang Ninh

Quang Ninh underground coal mines are currently in the phase of finishing up the mineralreserves located near the surface. Also, in this phase, a number of coal mines have opened and preparednew mine sites for the extraction of the reserves at greater depth. Several mines have mined at -350 mdepth and are driving opening excavations at -500 m depth below sea level. The mining at greater depthfaces many difficulties, such as a significant increase in support and excavation pressures. The longwallface pressure is mostly manifested in great magnitude that causes support overloaded and jumped andface spall/roof fall. This paper, based on the geological condition of the Seam 11 Ha Lam coal mine,uses the numerical program UDEC for studying the impact of mining depth on stress distribution aroundthe longwall face. The results show that the deeper the mining is, the greater the plastic deformationzone is. The peak front abutment stress moves closer to the coal wall, mainly concentrating on theimmediate roof and top coal. The top coal is greatly broken, and its bearing capacity is decreased. Somesolutions to the stability of roof strata are proposed, and a proper working resistance of support isdetermined. Additionally, the paper suggests that the starting depth for deep mining in Quang Ninhunderground coal mines should be -350 m below sea level.

Study on the Analysis of Secondary Anchoring Mechanism and Effective Distance

2011 ◽  
Vol 71-78 ◽  
pp. 4014-4019
Author(s):  
Lai Wang Jing ◽  
Li Ping Ye ◽  
Peng Wei Hao ◽  
Ke Xiu Zhao
Keyword(s):  
Coal Mine ◽  
Elastoplastic Deformation ◽  
Soft Rock ◽  
Reference Value ◽  
Fem Analysis ◽  
Effective Distance ◽  
Exact Data ◽  
Use For Reference ◽  
Face Support

The paper is intent to open out the mechanism and effective distance of secondary anchoring in coal mine rock laneway support. Though the analysis of elastoplastic deformation, caused by heading face support removing in laneway development, the paper explained that secondary anchoring is necessary and important to rock laneway, and relatively exact data were given by FEM analysis. The paper illustrated a special example, and put it up with meticulous analysis, the results were not only having important reference value to coal mine soft rock laneway support, but also having definite use for reference to other mine soft rock laneway support.

scholarly journals RADAR-BASED RAINFALL ESTIMATION IN BOYONG RIVER (BO-D5)

2021 ◽  
Vol 3 (1) ◽  
pp. 007-019
Author(s):  
Henggar Risa Destania ◽  
Achmad Syarifudin
Keyword(s):  
Soil Layer ◽  
Reference Value ◽  
Radar Data ◽  
Drainage Area ◽  
Current Status ◽  
Water Index ◽  
X Band ◽  
Short And Long Term ◽  
Sediment Disaster ◽  
Maximum Limit

Sediment-related disasters are terrible disasters that can catastrophically impact facilities. People must keep in mind to make sediment-related disaster information that can be predicted from rainfall and response of drainage area by using snakelike. This research produces important indices on precipitation related to debris. It shows the current status of the stage of the response of drainage area against rainfall by using a couple of short- and long-term indices. It shows the water storage volume in the soil layer with the calculation of soil water index (SWI) by using X-band MP (Multi-Parameter) rainfall radar data that has been installed at the top of Merapi Mountain (Merapi Museum). It was confirmed that from June 2018 – June 2019, with 80.28 mm SWI, maximum values do not exceed the standard reference value of SWI (120 – 160 mm) set from JMA. It means that 80.28 mm of SWI value has not yet become the maximum limit of SWI value for lahar occurrence in the Boyong drainage area (BO-D5). The maximum limit of SWI value can be generated if sediment disaster occurrences are available.

scholarly journals Restoration of vegetation cover in reclaimed areas with coal preparation waste in Kuzbass

2021 ◽  
Vol 244 ◽  
pp. 01015
Author(s):  
Sergey Soloviev ◽  
Irina Semina ◽  
Vladimir Androkhanov ◽  
Asya Shipilova
Keyword(s):  
Pinus Sylvestris ◽  
Coal Mine ◽  
Vegetation Cover ◽  
Field Survey ◽  
Soil Layer ◽  
Perennial Grasses ◽  
Coal Preparation ◽  
Fertile Soil ◽  
Favorable Conditions ◽  
Trees And Shrubs

The paper presents the results of research and assessment of the degree of restoration of vegetation cover in reclaimed areas with the use of coal preparation waste in Kuzbass. Reclamation of disturbed lands was carried out by backfilling the depleted pits of the former coal mine with coal preparation waste and forming a root layer on the leveled surface of the waste using materials of the fertile soil layer (FSL) and potentially fertile rocks (PFR). During the field survey of reclamation sites, it was found that when sowing perennial grasses (Bromopsis inermis, Medicago sativa, etc.) or planting trees and shrubs (Hippophae rhamnoides, Pinus sylvestris, etc.) on the root layer formed of FSL and/or PFR, favorable conditions are created in the reclaimed areas for the formation of the primary phytocenosis. Studies have also shown that in reclaimed areas where a fertile soil layer was used to form a root layer, a gradual restoration of soil properties is recorded in the surface fill layers, which in some parameters are close to natural soils common in the adjacent territories.

scholarly journals Studying the agrochemical features of undisturbed soils on the territory of the Mokhovsky coal mine in the Kemerovo Region to assess their use in biological reclamation

2020 ◽  
Vol 9 (2) ◽  
pp. 36-41
Author(s):  
Svetlana N. Vityaz ◽  
Marina A. Yakovchenko ◽  
Natalia A. Stenina ◽  
Anna S. Berezina ◽  
Anna A. Kosolapova
Keyword(s):  
Particle Size ◽  
Coal Mine ◽  
Humus Content ◽  
Soil Layer ◽  
Nutrient Content ◽  
Absorption Capacity ◽  
Fertile Soil ◽  
Birch Tree ◽  
Undisturbed Soils ◽  
Agricultural Restoration

This paper describes the results of the study of the Mokhovsky coal mine undisturbed soils in different horizons of the soil profile. The study was conducted on the Sartakinskoe, Mokhovskoe and Karakanskoe fields. In each field the authors have determined the species composition of phytocenoses and soil types, and studied soil horizons and agrochemical characteristics (particle size and soil composition, humus content, hydrogen index, nutrient content, hydrolytic acidity, the amount of absorbed bases, absorption capacity, etc.). It has been established that the vegetation of the phytocenoses of the studied fields is represented by birch tree trunks with the inclusion of pine, sections of meadow and small fragments of steppe communities, where perennial herbaceous plants play a significant role, which is typical for temperate floras of the northern hemisphere. The results of the analysis of the structural and particle size distribution of the agrochemical characteristics of undisturbed soils in the Mokhovskoe, Sartakinskoe and Karakanskoe fields of the Mokhovsky coal mine indicate that these soils are of agronomic value, therefore it is recommended to remove and store the fertile layer from these sites with a view to their further use in biological reclamation to increase quality, productivity and environmental value of the restored lands in the Kemerovo Region. The fertile soil layer (PRP) and the potentially fertile soil layer (PRSP) from the Mokhovskoye field is recommended for forestry while the Sartakinskoe and Karakanskoe fields for agricultural restoration.

scholarly journals Reclamation Suitability Evaluation of Damaged Mined Land Based on the Limit Condition Method－Example of Pingdingshan Tianan Ten Coal Mine

2021 ◽  
Vol 06 (09) ◽  
Author(s):  
Wu Ya-lin ◽  
Keyword(s):  
Coal Mine ◽  
Land Use Planning ◽  
Land Reclamation ◽  
Soil Layer ◽  
Evaluation Index ◽  
Limit Condition ◽  
Suitability Evaluation ◽  
Condition Method ◽  
Local Residents ◽  
Main Factors

Reclamation suitability evaluation is the basis for determining the reuse direction of damaged land. Limit condition method is the most widely used method in land reclamation suitability evaluation at present. In this paper, the limit condition method is used to evaluate the suitability of land reclamation of damaged land in Pingdingshan Tianan ten coal mine. The evaluation index of damaged area is determined as six main factors: field slope/land flatness, ponding, depth of collapse, soil texture, thickness of soil layer, irrigation and drainage conditions, and finally determine the reclamation direction of the land to be reclaimed in combination with the overall local land use planning and the overall wishes of local residents.

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