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| The Impact of Coal Mining Subsiding on Particle Size Composition in Shenfu Coalfield |
| Zhao Guoping1,2, Bi Yinli1, Yang Wei1, Shi Zhibao2, Xu Lianxiu3 |
1. China University of Ming Technology, Beijing 100083, China;
2. Shaanxi Province Research Institute for Sand Control, Yulin 710009, Shaanxi, China;
3. Advisory Services Department of Environmental Science in Yulin, Yulin 710009, Shaanxi, China |
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Abstract In order to master the effects and the process of coal mining subsiding on particle size composition in the surface environment, this paper studied the particle size variations using contrast method in Shenfu coalfield based on field investigation and sampling analysis of subsiding one year, two years and no subsiding. The results indicated that the particles in one year subsiding area and two years subsiding area were mainly composed of coarse and medium sands as many as 65%, and the particles in no subsiding area was mainly composed of medium and fine sand as many as 80%. There was no significant difference in particle size variations between one year subsiding area and two years subsiding area, but the difference between subsiding and no subsiding areas was significant. With the increase of mean particle diameter, driving wind speed of blown sand in one year subsiding area and two years subsiding areas increased by logarithmic function; while with the increase of the driving wind speed, there was an exponential function relation between amount of wind erosion and mean particle diameter. The distribution curve of one year subsiding area and two years subsiding areas were both bimodal, the peak value was 0.54 mm and 0.125 mm. While the distribution curve of no subsiding area was single peak, and the peak value was 0.125 mm. The fine and very fine sands in the surface environment(0-10 cm depth) were basic gone by wind, the particle in surface present coarsening phenomenon, and the wind erosion possibilities intensified.
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Received: 21 October 2014
Published: 20 November 2015
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2015, Vol. 35 
