Physical Experiments on the Deformation of Strata with Different Properties Induced by Underground Mining
Underground mining can cause ground and strata movements, which in turn cause damage to houses and the landscape. The different characteristics and properties of the strata encountered during mining can also result in corresponding deformation. In order to study the deformation and damage rules of...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Eastern Macedonia and Thrace Institute of Technology
2016-03-01
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| Series: | Journal of Engineering Science and Technology Review |
| Subjects: | |
| Online Access: | http://www.jestr.org/downloads/Volume9Issue1/fulltext91122016.pdf |
| Summary: | Underground mining can cause ground and strata movements, which in turn cause damage to houses and the landscape.
The different characteristics and properties of the strata encountered during mining can also result in corresponding
deformation. In order to study the deformation and damage rules of strata which are composed of unconsolidated soil
and bedrock induced by underground coal mining, a physical model that employs material sand, lime, and gypsum with
water was utilized firstly to simulate strata and ground movements. Then overlying strata with different properties were
created according to the corresponding ratio of the mixed material, physical models under two conditions (i.e., thick soil
layer and thin bedrock, and thin soil layer and thick bedrock) were set up. Lastly underground coal extraction was
conducted using the proposed models. Results show that the proportion of unconsolidated soil layer in the overlying
strata is the key factor that determines the significant differences in the movement of strata under the two special
conditions. When the ratio of the soil layer is large, the unconsolidated soil layer is loaded on the bedrock; the bedrock is
thus forced to move down, and the compression rate of the broken strata is increased. The soil layer follows the bedrock
as an integral movement to subsidence. When the ratio of the soil layer is small, the load on the strata is small, but the
structural function of the strata is obvious and the fraction degree in the strata is developed. The obtained results in this
study can be applied to support mine planning in the aspect of ground damage evaluation. |
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| ISSN: | 1791-2377 1791-2377 |