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- Title
煤矿地下水库不同人工坝体结构抗震性能研究.
- Authors
曹 志 国
- Abstract
As a new type of underground engineering structure, the coal mine underground reservoir project has been successfully applied in the western Shendong mining area. Long-term safe and stable operation is one of the core elements of coal mine underground reservoir technology. Reservoir dams, especially artificial dams, as water-retaining structures for coal mine underground reservoirs, are an important part of the safe operation of coal mine underground reservoirs. In order to ensure the safety of coal mine underground reservoirs under extreme conditions (such as mine earthquakes, earthquakes, etc.), it is necessary to conduct seismic safety analysis of artificial dam structures. The artificial dam structure is generally flat. Considering that the damage of the dam structure under mine earthquake or earthquake conditions is usually shear failure, in order to improve the seismic performance of the artificial dam, a new type of artificial dam structure for underground coal mines-arched artificial For the dam body, the stress state of the flat and arch artificial dams are compared and analyzed; using the finite element method, the flat artificial dams and arch artificial dams with magnitudes of 7, 8, 9, and 10 are obtained. The shear stress and displacement distribution cloud chart of, compares and analyzes the overall safety factors and possible failure modes of the two dams. The results show that the weak part of the artificial dam is the contact part with the coal and rock mass; the artificial dam of the underground reservoir is restricted by the roof and floor and the surrounding coal and rock mass, and can still maintain good safety performance under extreme special conditions. When the earthquake intensity reaches 10, the safety factors of the arched and flat artificial dams are 22.6 and 6.4, respectively; the action of the arch makes the coal pillar's reaction force on the artificial dam produce part of the compressive stress, and the arched artificial dam is part of the mine The seismic load is transferred to the coal pillar dam body, reducing the shear stress of the artificial dam body caused by the mine earthquake, and improving the seismic performance of the arch artificial dam body. The safety factor of the arch artificial dam body is a flat artificial dam when the seismic intensity is 10 More than 3.5 times the body.
- Subjects
ARCH dams; STRUCTURAL engineering; DAM failures; EARTHQUAKE hazard analysis; EARTHQUAKE intensity; COAL mining; COAL mining safety
- Publication
Coal Science & Technology (0253-2336), 2020, Vol 48, Issue 12, p237
- ISSN
0253-2336
- Publication type
Article
- DOI
10.13199/j.cnki.cst.2020.12.030