›› 2011, Vol. 32 ›› Issue (2): 533-536.

• Geotechnical Engineering • Previous Articles     Next Articles

Study of distribution of overlying strata fissures and its porosity characteristics

SONG Yan-jin, CHENG Guo-qiang, GUO Wei-jia   

  1. Key Laboratory of Mining Disaster Prevention and Control of Education Ministry, Shandong University of Science and Technology, Qingdao, Shandong 266510, China
  • Received:2009-10-10 Online:2011-02-10 Published:2011-02-16

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Abstract:

Based on elastic thin plate theory and key strata theory, the stratum subsidence was described quantitatively. The characterization of fissures distribution in overlying strata under the influence of mining is studied. Then, an approximate formula of porosity in the regular movement zone of overlying strata along strikes is achieved. The results show that the amount of the fissures on both sides of fissure field is more than that in central area, while the bigger separation appears below the key strata. The porosity is lessening along with the decreasing of depth. Generally, the curve of porosity of bottom area in mining overburden takes on a saddle shape; and the change is located around the key strata or hard rocks. The porosity curve of top area along the strikes is symmetric arched. The conclusions can be applied to the research of rock mass seepage and the comprehensive gas control.

Key words: goaf, overlying strata fissure, distribution law, porosity, gas control

CLC Number: 

  • TD 325
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