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http://dx.doi.org/10.7843/kgs.2008.24.5.117

Development of VPPE-BE Testing System to Evaluate Modulus under Post-Compaction Variation in Matric Suction for Unsaturated Compacted Soils  

Lee, Sei-Hyun (Dept. of Civil and Environmental Engrg., KAIST)
Seo, Won-Seok (Dept. of Civil, Architectural and Environmental Engrg., Univ. of Texas at Austin)
Choo, Yun-Wook (Dept. of Civil and Environmental Engrg., KAIST)
Kim, Dong-Soo (Dept. of Civil and Environmental Engrg., KAIST)
Publication Information
Journal of the Korean Geotechnical Society / v.24, no.5, 2008 , pp. 117-127 More about this Journal
Abstract
The volumetric pressure plate extractor (VPPE) was modified for the measurement of shear wave velocity ($V_s$) at various levels of matric suction as well as soil water characteristic curve (SWCC). A non-destructive technique with a pair of bender element (BE) was employed in order to measure the $V_s$ and the corresponding maximum shear modulus ($G_{max}$) of unsaturated soil specimens. Three types of soil were collected from different road construction sites in Korea. For all test soils, the variations in $G_{max}$ with the various levels of water content and matric suction were investigated using the developed apparatus. Compared with the preceding results from the suction-controlled torsional shear (TS) testing system and in-situ seismic tests, the feasibility fur evaluating modulus characteristics of unsaturated compacted soils with the developed VPPE-BE system was assessed. It was confirmed that the newly developed system would be potentially helpful in modeling seasonal variation of modulus.
Keywords
Bender Element (BE); Matric Suction, Maximum Shear Modulus ($G_{max}$); Unsaturated Compacted Soil; Volumetric Pressure Plate Extractor (VPPE); Water Content;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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