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Copyright of Coal Science & Technology (0253-2336) is the property of Coal Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to evaluate thehydrochemical characteristics and evolution of groundwater in Yushen mining area and Shenfu mining area, 53 samples of groundwater of the researched area were collected and tested. It calculated the contribution rates of cations and anions, correlation coefficient matrix method, piper trilinear diagram, Gibbs distribution graph and milligram equivalent ration with Na+ and Cl- by mathematical statistics. It analyzed the characteristics of groundwater ion and hydrochemical characteristics and drew the isogram of groundwater hardness in the area and zoning map of hydrochemical type. The results show that the groundwater in the area is weak alkaline water. The less solubility of Ca2+ is precipitated out, which is affected by evaporation, is the highest contribution rate. The groundwater TDS content of Malan loess is the lowest and the groundwater TDS in the blunt pluvial aquifer is the highest. The total hardness increases gradually from the blown-sand region to the loess area. Ca2+ and SO2-4 are highly correlation with TDS. Groundwater hydrochemical characteristics are mainly controlled by water-rock interaction, the groundwater is dominated by HCO3 water in the blown-sand region and it is dominated by HCO3 • SO4 water in loess ridge-hilly area. [ABSTRACT FROM AUTHOR]

Copyright of Coal Science & Technology (0253-2336) is the property of Coal Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Coal Science & Technology (0253-2336) is the property of Coal Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Coal Science & Technology (0253-2336) is the property of Coal Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Water resources destruction and geological environment changes caused by mining in ecologically fragile areas of western China have seriously restricted the sustainable development of economy, society and environment in mining areas. Through reviewing the research progress of water-preserved coal mining and carrying capacity of geological environment in coal mining areas, and combining with the current situation of geological environment in western China rich in coal and short of water, the research framework of carrying capacity of geological environment based on the concept of water-preserved coal mining is proposed. It is considered that the function mechanism of "coal mining activity-water resource destruction-geological environment effect"should be systematically analyzed by combining the concept of water-preserved coal mining with the theory of carrying capacity of geological environment. The methods of attribute analysis, ecological demand analysis, numerical analysis and catastrophe theory should be used in studying the carrying capacity of geological environment. In particular, the quantitative method, comprehensive evaluation method and the classification method of carrying status and carrying capacity of geological environment should be investigated. By means of simulation experiment, the relationship data between the geological environment and the critical value of mining intensity under the carrying capacity of typical coal mine area are obtained. Then the technological method of coal mining under water-containing for controlling and alleviating the geological environment problems in coal mine area is extracted to determine the reasonable mining intensity and scale. On the basis of the research of carrying capacity, this paper put forward the collaborative monitoring method for the influencing factors of carrying capacity of geological environment, and the criterion of bearing capacity early warning grade of carrying capacity. The connotation and basic research ideas of geological environmental carrying capacity based on the concept of water-preserved coal mining will enrich the scientific connotation of water-preserved coal mining and geological environmental carrying capacity, and provide a theoretical and technical support for the coordinated development of coal resources and water resources protection in the fragile ecological environment areas of western China. [ABSTRACT FROM AUTHOR]

With Chinese coal mining strategic west shift in the past 20 years,the contiguous area of Maowusu Desert and Loess Plateau becomes an important coal producing area in China.In this area,the water resource is short and the ecological environment is fragile.Springs,as the precious groundwater resources and the main water source for ecology,production and living,is of great significance.Based on the hydrology and ecology observation of 2 580 springs in 1996 and 2016,springs had been classified by recharge source in dry season.The springs natural characteristics had been analyzed,as well as springs evolution and ecological effect combined with the influence of coal mining.And the trend of springs evolution had been predicted.The results show that springs are divided into 3 types by recharge source in dry season,including sand infiltration recharge spring,loess infiltration recharge spring and combined infiltration recharge spring.When the spring single flow is greater than 10 L/s,the numbers of sand infiltration recharge spring is the most.And the total numbers of combined infiltration recharge spring is the most.The ecological effect of loess infiltration recharge spring is most significant.Before 1994,there were 2 580 springs (groups) in the survey area,with a total flow of 4 997.059 7 L/s.In 2015,there were 376 springs (groups),with a total flow of 996.392 L/s.The main reason for the large attenuation of springs in the past 20 years is that combined infiltration recharge springs disappear by structural damage to aquifers-aquicludes and lateral supply truncation.The sand infiltration recharge springs are distributed in future coal mining areas,and aquifers-aquicludes structure is stable in this area.The sand infiltration recharge springs wave tends to be stable by mining subsidence and overflow of aquifer.With high intensive coal mining,the springs,water body and wetland area reduce in the study area,and the watershed ecological degradation is remarkable. [ABSTRACT FROM AUTHOR]

Yu-Shen-Fu mining area is an important coal producing area in China，where geological disasters constantly occurs because of high intensity，large scale mining. The present paper studied the characteristics of mine geological disasters by remote sensing and field survey. The results show that there are five kinds of geological disasters in the area，including ground surface collapse，ground fissures，mine earthquake over goaf，surface water reduction，groundwater table decline and land degradation. Ground surface collapse，closely correlated with high intensity mining，can be subdivided to four zones. Space dimension of ground fissure is around 1.45-1.51，and there are more ground fissures perpendicular to the direction of working face than that of along the direction of working face. The mining causes 46 mine earthquakes over goaf，and the largest magnitude is 3.2. The area where groundwater level decline more than 8 m is 33 km2. It is gangue covered land that accounts for a larger disruption on land use structure.The paper also points out that the future research might focus on the mine geology disaster prevention and control technology and establish a geological environment monitoring system. [ABSTRACT FROM AUTHOR]

In order to study the influence of high intensity coal mining on the groundwaterlevel in Yu-shen-fu area,and analyze the relationship between phreatic decline and coal mining intensity, authors draw the groundwater level contour map in 1995 and 2014 through data collection and field investigation, then obtained the groundwater level variation and the relationship of mutual-feed joint-variation with coal mining intensity through map overlapping. The results indicate that; (1) 73.0% of regional groundwater level does not change significantly, but there are 758. 9 km2 where the groundwater level lowers more than 8 m, accounts for 7. 3% of the study area, thus it has a large impact on the regional groundwater balance. (2) The high intensity coal mining is the main driving force that causes the groundwater level decline more than 8 m ,7 1 .5% of which is concerned with mining scale. (3) Water flowing fracture zone and aquifer characteristics are two factors to control the range and degree of groundwater level variation. Coal mining with water-containing is extremely important to achieve the harmonious development of resources and environment. [ABSTRACT FROM AUTHOR]