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Evaluation of Field Nonlinear Modulus of Subgrnde Soils Using Repetitive Static Plate Bearing Load Test  

Kim Dong-Soo (Dept. of Civil & Environmental Eng., Korea Advanced Inst. of Science & Tech.,)
Seo Won-Seok (Dept. of Civil & Environmental Eng., Korea Advanced Inst. of Science & Tech.,)
Kweon Gi-Chul (Dept. of Civil Eng., Dongeui Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.21, no.6, 2005 , pp. 67-79 More about this Journal
Abstract
The field plate load test has a good potential for determining modulus since it measures both plate pressure and settlement. Conventionally the modulus has been assumed to be a constant secant value defined from the settlement of the plate at a given load intensity. A constant modulus (modulus of subgrade reaction, k), however, may not be a representative value of subgrade soil under working load. Field strain(o. stress)-dependent modulus characteristics of subgrade soils, at relatively low to intermediate strains, are important in the pavement design. In this study, the field strain dependent moduli of subgrade soils were obtained using cyclic plate load test. Testing procedure and data reduction method are proposed. The field crosshole and laboratory resonant column tests were also performed to determine field nonlinear modulus at $0.001\%\;to\;0.1\%$ strains, and the modulus values and nonlinear trends are compared to those obtained by cyclic plate load tests. Both modulus values match relatively well when the different state of stress between two tests was considered, and the applicability of field cyclic plate load test for determining nonlinear modulus values of subgrade soils is verified.
Keywords
plate load test; field nonlinear modulus; subgrade soil; strain; state of stress;
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Times Cited By KSCI : 1  (Citation Analysis)
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