›› 2010, Vol. 31 ›› Issue (6): 1853-1857.

• Geotechnical Engineering • Previous Articles     Next Articles

Application of modified logarithmic model for suction strength to bearing capacity of subsoil

MA Shao-kun1-3，HUANG Mao-song2, 3，HU Ping4，QIN Hui-lai2, 3   

  1. 1. College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China; 2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 3. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 4. Department of Civil Engineering, University of Jinan, Jinan 250022, China
  • Received:2008-12-16 Online:2010-06-10 Published:2010-06-25

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Abstract:

In order to reflect the law on shear strength with respect to matric suction in unsaturated soil, a modified logarithmic model is presented. Through comparisons between some important test results at home and abroad, it can be found that the modified logarithmic model is identical with others in low suction range while it has obvious advantages than others in high suction range. In this modified logarithmic model, parameters have explicit physical meanings, and intrinsical characteristics of soil-water characteristic curve can be reflected. Various kinds of soils with different residual values can be modeled well by introducing the parameter named b. The modified logarithmic model is used to analyze the bearing capacity of subsoil under drained condition. The bearing capacity is influenced obviously by water saturation degree. Suction can increase the bearing capacity significantly. The rate of increment increases with the reduction of saturation degree.

Key words: ultimate bearing capacity, unsaturated soil, suction strength, shear strength, rigid foundation

CLC Number: 

  • TU 470
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