›› 2010, Vol. 31 ›› Issue (8): 2361-2366.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

A catastrophe model for floor water-resisting key stratum instability induced by dynamic disturbance

ZUO Yu-jun 1, LI Shu-cai2 , QIN Si-feng1, LI Li-ping2   

  1. 1. Research Center for Numerical Test of Material Failure, Dalian University, Dalian 116622,.China；2. Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan 250061, China
  • Received:2009-03-05 Online:2010-08-10 Published:2010-08-30

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Abstract:

The catastrophe theory is applied to analyze the mechanism of floor water-resisting key stratum instability induced by dynamic disturbance during coal mining;and the double cusp catastrophe model is proposed for instability analysis of floor water-resisting key stratum above confined aquifer under dynamic disturbance in order that the complicated dynamic failure process of floor water-resisting key stratum is described. By using catastrophe theory analysis a new criterion for dynamic instability of floor water-resisting key stratum is given. It is proved that whether failure of the floor water-resisting key stratum being occurred depends not only on the key stratum feature but also on the size and way of exterior loading. And the vibration frequency of floor water-resisting key stratum is affected by static load such as confined aquifer pressure. Moreover, dynamic response of floor water-resisting key stratum loaded by static pressure such as confined aquifer is different when dynamic disturbance including different amplitude, different time and different frequency is loaded to floor water-resisting key stratum.

Key words: water inrush；floor water-resisting key stratum；dynamic disturbance, catastrophe, stability

CLC Number: 

  • TD322.4
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