Grouting, soil covering and fire extinguishing works for the debris heap in Sangshuping Coal Mine of Hancheng Branch ,Shaanxi Coal & Chemical Industry Construction (Group) Co., Ltd.
1. Introduction
The gangue of the debris heap in Sangshuping Coal Mine of Hancheng Branch, Shaanxi Coal & Chemical Industry Construction (Group) Co., Ltd., has accumulated to 9×106m3, and the highest point of the "mountain" formed by artificial accumulation has reached 630m above sea level, which is more than 30 meters higher than the surrounding hilltops. The debris heap covers an area of about 86,667m2, which is a typical gully type debris heap in China. There are some ecological environmental problems, such as poor stability of the debris heap, explosion caused by spontaneous combustion of the debris heap and air pollution caused by spontaneous combustion of the debris heap.
Figure 1 Terminal of loess gully at the debris heap (Southeast) Figure 2 Terminal of loess gully at the debris heap (Northwest)
Figure 3 Spontaneous combustion of the debris heap (Distant view) Figure 2 Spontaneous combustion of the debris heap (Close View)
2. Treatment solution
After comparison of multiple schemes, for Sangshuping Debris Heap the comprehensive treatment scheme of "rebuilding gangue conveying track-carrying out retaining works-grouting and fire extinguishing-leveling messy gangue piles-covering with soil-greening" was adopted.
Figure 5 Block diagram of the construction sequence
3. Construction situation
The debris heap was lowered from 630m to 580m above the sea level, the 1 million cubic meters of gangue were pushed and rolled, 11 steps of gangue hill and 2 retaining walls were built. 1 fire-fighting pool was built, At the debris heap, the Grouting and fire-fighting area was 33,333m2, tree-planting and landscaping. area was over 46,667m2.
Figure 6 Construction of Gangue- pushing platform Figure 7 Drilling, grouting and fire extinguishing
Figure 8 Grouting and drilling works Figure 9 Stirring of grout
4. Achieved Accomplishment
It is a miracle in the fire extinguishing works of the coal mine debris heaps in China to completely destroy the fire source of the debris heaps that have been burning for more than 30 years, which provides a good engineering demonstration for the fire extinguishing of the similar debris heaps.
Figure 10 Percentage of landscaping after fireeExtinguishing Figure 11 Samples of grout stones from Boreholes of
Figure 12 Effect of landscaping on the debris heap (Distant view) Figure 13 Sprinkling irrigation system for the debris heap
Figure 14 Construction of a reservoir on the top of the debris heap (for Cooling and fire extinguishing, and for irrigation of landscaping)
5. FAQ
Q: What are the basic conditions for the spontaneous combustion of gully-type debris heap? What is the idea of fire extinguishing technology?
A: The basic conditions for spontaneous combustion of debris heap are the combustibles such as sulfur and carbon contained in gangue, and oxygen and temperature. Fire extinguishing for debris heap should start from three aspects: isolating oxygen, stopping combustibles and reducing the temperature of gangue.
Q: In what other fields can the fire extinguishing technology of debris heap be popularized and applied?
A: It can be popularized and applied in fires such as spontaneous combustion in coal seam and spontaneous combustion in open pit mines.
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