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| Effects of cracks in coal mining subsidence area on soil moisture content in Shenfu-Dongsheng coalfield |
| GUO Qiaoling1,2, MA Zhihua1, SU Ning1, YANG Yunsong3, HAN Zhenying1 |
1. Institute of Resources & Environment, Henan Polytechnic University, 454003, Jiaozuo, Henan, China;
2. Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region, 454003, Jiaozuo, Henan, China;
3. School of Business Administration, Henan Polytechnic University, 454003, Jiaozuo, Henan, China |
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Abstract [Background] Shenfu-Dongsheng coalfield is an important coal base in China. The occurrence of a large area collapse and a large number of ground cracks reduced soil and water conservation, resulting in soil and water loss. Studying the effect of cracks on soil moisture content in subsidence area of coal mining may provide basic support for controlling soil and water loss and protecting ecological environment.[Methods] Taking coal mining subsidence area in Shigetai Coal Mine as the research target, the 52 sampling sites were set up in the 100 m×100 m test area of subsidence area. Then the 7 soil layers, such as 0, 10, 20, 30, 40, 50, and 60 cm depth in each sampling site, were sampled respectively. mathematical statistics were used to analyze the soil moisture content in the cracks (8,4,3,2, and 1 cm), and in the unfractured areas. The spatial variability of soil moisture content in coal mining subsidence area was analyzed by geostatistics and Surfer 11.0.[Results] 1)In the same depth soil layer, the soil moisture content in the crack area was obviously less than that in the non-crack area. With the increase of crack width the decrease amplitude of soil moisture content was increasing. 2) In vertical distribution, the soil moisture content increased with the increase of soil depth when the crack width ≤ 3 cm. It indicated the moisture content at the relatively deep soil layer was less affected by the narrow crack. The soilmoisture content under the ground 30 cm to 60 cm was obviously less than when the crack width >3 cm, indicating the crack with large width had greater influence on the moisture content at relatively deep soil layer. 3)In horizontal variation of soil moisture content, the low soil moisture content of each soil layer was in the crack development zone. The high soil moisture content of each soil layer was in vegetation covering zone of non-crack area. 4) In vertical variation of soil moisture content, the variation intensity in the soil layers of 0 cm and 40-60 cm in crack zone was greater than that in non-crack zone. The variation intensity in the soil layers of 10-30 cm in crack zone was less than that in non-crack zone.[Conclusions] This study proved that the crack in the coal mining subsidence area destroyed soil structure, resulted in the decrease of soil moisture content, affected the spatial distribution of soil moisture, caused soil water loss, and consequently led to ecological degradation.
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Received: 16 January 2018
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