Study of resilient modulus test equipments uncertainty and permanent deformation of subgrade
博士 === 國立中央大學 === 土木工程研究所 === 89 === Since 1986, AASHTO standardized the test method for subgrade soil resilient modulus in specifications. Still the skills for the operation of the equipment was lacked, and variation and accuracy in test results remain difficult to control. In this paper, synthetic...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2001
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| Online Access: | http://ndltd.ncl.edu.tw/handle/79860535714564692219 |
| Summary: | 博士 === 國立中央大學 === 土木工程研究所 === 89 === Since 1986, AASHTO standardized the test method for subgrade soil resilient modulus in specifications. Still the skills for the operation of the equipment was lacked, and variation and accuracy in test results remain difficult to control. In this paper, synthetic specimens were used to calibrate the triaxial testing system. Evaluation on the uncertainty analysis showed that the precision and accuracy of linear variable displacement transformer has the greatest effect on resilient modulus test results; while that of load has less effect. Results derived from uncertainty analysis on the test system can be used to bound the upper and lower limit of the test outcome, such that criteria for correction or rejection of resilient modulus test results can be established.
Permanent deformation of cohesive soil with repeated loading acted can be boundary with shakedown deformation and the loading cycle. Set 5% as failure strain upper limit can evaluate the possibility of subgrade soil under specific stress level and water content situation. And also, regression models of resilient and permanent strain shakedown strain was established and provided a effect way to prediction.
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