›› 2003, Vol. 24 ›› Issue (2): 151-158.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Artificial rainfall infiltration tests on a well-instrumented unsaturated expansive soil slope

ZHAN Liang-tong１，NG Wang-wai Charles1, BAO Cheng-gang２, GONG Bi-wei２   

  1. 1. The Hong Kong University of Science and Technology, Hong Kong; 2. Yangtze River Scientific Research Institute, Wuhan 430010, China
  • Received:2002-11-29 Online:2003-02-10 Published:2014-08-19

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Abstract: To improve our understanding of the fundamental mechanism of rain-induced landslides in unsaturated expansive soils, artificial rainfall simulation tests were carried out on an 11 m high cut slope in a typical medium-plastic expansive clay in Hubei of China. The slope was well-instrumented with tensiometers, thermal conductivity suction sensors, moisture probes, earth pressure cells, inclinometers, a tipping bucket rain gauge, a vee-notch flow meter and an evaporimeter. Two artificial rainfall events were created during a month of field investigation and monitoring. Monitored results demonstrate: rainfall infiltration leads to a significant increase in pore-water pressure and water content within the top 2 m soil layer, which may result in a reduction of shear strength due to a decrease in effective stress and wetting-induced softening. On the other hand, rainfall infiltration causes a significant increase in total stress ratio (sh/sv), which may lead to a local passive failure and then trigger a progressive slope failure under a continuous rainfall condition.

Key words: expansive soil slope, rainfall infiltration, in-situ monitoring, pore water pressure, earth pressure, deformation

CLC Number: 

  • TU413.5
  • Please send e-mail to pingzhou3@126.com if you would like to read full paper in English for free. Parts of our published papers have English translations.
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