›› 2010, Vol. 31 ›› Issue (5): 1539-1544.

• Geotechnical Engineering • Previous Articles     Next Articles

A method for determining critical thickness of base soil of foundation pit subjected to confined water

WANG Yu-lin 1, 2, XIE Kang-he1, LU Meng-meng1, WANG Kun1   

  1. 1. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310027, China; 2. Department of Civil Engineering and Architecture, Wuyi University, Wuyishan Fujian, 354300, China
  • Received:2009-07-15 Online:2010-05-10 Published:2010-05-24

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Abstract:

The change of pore water pressure and soil effective stress in foundation pit base, subjected to fast increase of confined water pressure due to sudden rise of the influent river during flood peak, have been analyzed. Based on soil permeability and its two damage mechanisms (i.e. tensile failure and shear failure), a new method for determining critical thickness of base plate of foundation pit is presented based on elastic theory. The new method is compared with traditional method to calculate the critical thickness of base soil of foundation pit by case study. Results show that the new method considering indices cu, ?u, and the size of foundation pit base, is more reasonable than the traditional method. However, the results calculated by the method in this paper reduce to the results by traditional method as for highly permeable soil like sand.

Key words: confined aquifer, effective stress, damage patterns, critical thickness, elastic mechanics

CLC Number: 

  • TV 139.1
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