›› 2009, Vol. 30 ›› Issue (11): 3365-3371.

• Geotechnical Engineering • Previous Articles     Next Articles

Study of instability process and failure mechanism of ash storage dam in a power plant

CHEN Shan-xiong，FENG Mei-guo，XU Xi-chang，CHEN Shou-yi   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Insitute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
  • Received:2008-11-18 Online:2009-11-10 Published:2010-01-07

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Abstract:

Based on unsaturated soil mechanics theory, the instability process of ash storage dam in a power plant is analyzed and failure mechanism of that is revealed. With the increase of lasting time of retaining water by the1st sub dam, some phenomena will occur, such as water infiltrates into the dam body gradually, the phreatic surface rises constantly, the unsaturated region reduces corresponsively, the pore water pressure increases and the shear strength decreases continuously in the site which is influenced by water infiltration. When the process develops to a certain degree, the damage and slide of this ash storage will happen. The analysis in this paper explains clearly the reason why the stability of this ash storage dam suffers great threat if the dry beach disappears for a long period. This study may provide a reference for stability evaluation and forecast of those ash storage dams and tailings dams with the similar working condition.

Key words: ash storage dam, phreatic surface, unsaturated soil theory, instability process, failure mechanism

CLC Number: 

  • TU 443
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