Instrumentation of an Unsaturated Expansive Soil Slope

In order to aid understanding of the complex soil-water interaction in an unsaturated expansive soil slope subjected to rainfall infiltration, this paper details a comprehensive instrumentation and monitoring program conducted on an 11-m high cut slope in Hubei, China. Instrumentation included jet-filled tensiometers, thermal conductivity suction sensors, moisture probes, earth pressure cells, inclinometers, vertical movement points, an artificial rainfall simulator, a tipping bucket rain gage, a vee-notch flow meter, and an evaporimeter. The technique and experience associated with each type of instrumentation are presented with an emphasis on the difference from the instrumentation in nonexpansive soils. In particular, a deliberate sealing scheme was adopted to prevent the potential bypass water flow through the shallow cracks into the installation holes for the suction sensors and moisture probes. All the instruments worked well throughout the 2-month monitoring period, during which 2 artificial rainfall events were created. Recorded responses in pore-water pressure, water content, horizontal stress, and soil deformation were reasonably consistent with one another.

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  • Authors:
    • Zhan, Tony L T
    • Ng, C W W
    • Fredlund, Delwyn G
  • Publication Date: 2007-3


  • English

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  • Accession Number: 01049777
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 10 2007 3:08PM