神南矿区采煤沉陷裂缝对土壤表层含水量的影响
Influence of coal mining subsidence cracks on soil surface watercontent in Shennan Mining Area
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摘要: 为探究西部风沙区采煤沉陷裂缝对土壤表层含水量（0～20 cm）的影响，以神南柠条塔煤矿某工作面为研究区，使用时域反射仪（TDR）对动态裂缝以及不同宽度的地裂缝进行了土壤的水分含量监测，结果表明：①在动态裂缝整个发育周期内，裂缝周边表层含水量呈现处一个先快速下降后缓慢上升的趋势，且相对出塌陷侧的含水量损失量小于相对出露侧；且裂缝相对塌陷侧含水量及含水量恢复速度稍大于相对露出侧；在裂缝相对出露侧的土壤含水量受影响范围在85 cm内，影响周期为13 d；在裂缝相对塌陷侧的土壤含水量受影响范围在55 cm内，影响周期为12 d；在土壤自修复的作用下，土壤的含水量都可以得到基本的恢复；② 对超充分采动区内不同裂缝宽度条件下 (2、5、9、13、17、24、32、35、38 mm) 的土壤含水量进行对比分析，发现在宽2、5 mm的裂缝对土壤含水量无显著影响，9 mm及以上的裂缝中，当裂缝宽度相同时，距离裂缝位置越远，土壤含水量越高；在距离裂缝相等时，裂缝宽度越大，土壤含水量越低。Abstract: In order to explore the influence of coal mining subsidence cracks on soil surface water content (0～20cm) in the western sandy area, a working face in Shennan Ningtiaota coal mine was taken as the study area, and the dynamic cracks and ground fissures of different widths were investigated by TDR. The results show that:① During the entire development period of dynamic fractures, the surface water content around the fracture decreases rapidly at first and then increases slowly, and the loss of water content on the lower side is less than that on the upper side, and the water content and water content recovery rate on the lower side of the crack are slightly higher than those on the upper side. The soil water content on the upper side of the crack is affected within 85 cm with a period of 13 days, and the soil water content on the lower side of the crack is affected within 55 cm with a period of 12 d, and the soil water content on the lower side of the crack is slightly faster than that on the upper side of the crack, under the action of soil self-repair, the soil water content can be basically restored; ② under the conditions of different widths (2,5,9,13,17,24,32,35,38 mm) soil water content was compared and analyzed, and it was found that 2 and 5 mm wide cracks had no significant effect on soil water content. In cracks of 9 mm and above, when the crack[LM]width is the same, the farther away from the crack location, the higher the soil water content; when the distance from the crack is equal, the larger the crack width, the lower the soil water content.
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Keywords:
- Shennan Mining Area /
- semi-arid sandy area /
- dynamic fractures /
- soil water content /
- crack width
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