›› 2011, Vol. 32 ›› Issue (12): 3653-3659.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Basal-heave stability of excavations considering groundwater level and pore water pressure fluctuations by upper bound method

ZHANG Fei1, 2, LI Jing-pei1, 2, TANG Yao1, 2   

  1. 1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China
  • Received:2011-06-21 Online:2011-12-10 Published:2011-12-13

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Abstract: The groundwater level and pore water pressure distribution of retaining excavation were analyzed based on the upper bound theorem. The work of water pressure was introduced into the upper bound work balance equation as external loading, and the Prandtl soil slip mode was chosen to analyze basal-heave stability of excavation considering groundwater level and pore water pressure changing. In addition, the effects of the groundwater level, soil strength, location of hard stratum and width of foundation pit on the basal-heave stability coefficient were discussed; and two practical cases were calculated to verify calculation formula applicability. Analysis results show that the groundwater level and pore water pressure influence basal-heave stability; and groundwater is an important adverse factor of excavation basal-heave stability. Comparing with Terzaghi’s method, Bjerrum & Eide’s method and Chang’s method, calculation method of this paper can reflect the influence of groundwater level and pore water pressure on basal-heave stability; and it provide a reasonable calculation method of excavation basal-heave stability in soft soil.

Key words: excavation, pore water pressure, limit analysis, upper bound method, basal-heave stability, factor of safety

CLC Number: 

  • TV 551.4
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