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Frontiers of Earth Science

Front. Earth Sci.    2015, Vol. 9 Issue (2) : 330-341     DOI: 10.1007/s11707-014-0467-2
A novel ground surface subsidence prediction model for sub-critical mining in the geological condition of a thick alluvium layer
Zhanqiang CHANG1,*(),Jinzhuang WANG2,Mi CHEN1,Zurui AO1,Qi YAO1
1. College of Resource, Environment & Tourism, Capital Normal University, Beijing 100048, China
2. Institute of Earth Sciences and Mapping, China University of Mining and Technology, Beijing 100083, China
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A substantial number of the coal mines in China are in the geological condition of thick alluvium layer. Under these circumstances, it does not make sense to predict ground surface subsidence and other deformations by using conventional prediction models. This paper presents a novel ground surface subsidence prediction model for sub-critical mining in the geological condition of thick alluvium layer. The geological composition and mechanical properties of thick alluvium is regarded as a random medium, as are the uniformly distributed loads on rock mass; however, the overburden of the rock mass in the bending zone is looked upon as a hard stratum controlling the ground surface subsidence. The different subsidence and displacement mechanisms for the rock mass and the thick alluvium layer are respectively considered and described in this model, which indicates satisfactory performances in a practical prediction case.

Keywords ground surface subsidence      thick alluvium layer      sub-critical mining      prediction model     
Corresponding Authors: Zhanqiang CHANG   
Online First Date: 12 December 2014    Issue Date: 30 April 2015
 Cite this article:   
Zhanqiang CHANG,Zurui AO,Qi YAO, et al. A novel ground surface subsidence prediction model for sub-critical mining in the geological condition of a thick alluvium layer[J]. Front. Earth Sci., 2015, 9(2): 330-341.
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Zhanqiang CHANG
Zurui AO
Jinzhuang WANG
Fig.1  The formation process of a fissure arch (Wang et al., 2004).
Fig.2  The stress state in the abutment pressure zone and rock compression deformation on the excavation boundary.
Fig.3  The distribution of bending, fractured, and caved zones in sub-critical mining.
Fig.4  The stress state of rock stratum in the bending zone.
Fig.5  The rectangular elastic thin plate.
Fig.6  The propagation of underground mining.
Fig.7  The establishment of coordinate systems.
Fig.8  Location of Dongpang Coal Mine.
Fig.9  Layout of Strike Observation Line for Working Panel 2107. R1 and R2 represent the controlling points; c1, c2, …, c21 are the observation points.
Fig.10  Comparison between the predicted subsidence and horizontal displacement values, as well as the corresponding actual observed values. (a) ground surface subsidence along strike; (b) ground surface horizontal displacement along strike.
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