›› 2010, Vol. 31 ›› Issue (S1): 232-236.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Prediction of surface subsidence in underground mining seam based on the boundary value method

YANG Zhi-lin   

  1. College of Sciences, Xi'an University of Science and Technology, Xi'an 710054, China
  • Received:2010-04-24 Online:2010-08-10 Published:2010-09-09

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Abstract:

Coupling behavior of rock and soil mass above the goaf to the surface subsidence can be considered as boundary value problems in the theory of elasticity. The stress boundary formed by unconsolidated soil layers of different characters and the displacement boundary formed between rock and soil mass constitute relevant determining conditions of boundary value problems. According to current research results, a prediction method of the surface subsidence based on the boundary value method was put forward to reveal surface subsidence laws due to underground mining. Some computation formulas for soil displacement and surface subsidence were derived; and the range of the surface subsidence was determined; and an application with the example of surface subsidence for Daliuta 1203 face was presented. The results indicate that the subsidence of ground and soil influenced by rock mass above the goaf depend on structural form of top rock layers, that the surface subsidence influenced by soil mass is related to the soil quality and soil thickness, and the soil subsidence affected by soil mass increases with nonlinear characteristics from bottom to top, until it reaches the extreme on the surface. And it is also shown that the range of the surface subsidence increases with the increasing of soil thickness, and its extension is far larger than the goaf itself.

Key words: goaf, rock and soil mass above goaf, boundary value problem, surface subsidence, range of surface subsidence

CLC Number: 

  • P 634
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