Calibration of the CRR-qc Correlation for Silty Sands in South Western Taiwan
碩士 === 國立交通大學 === 土木工程系所 === 96 === The simplified procedure commonly used for liquefaction potential assessment starts by considering the granular material as clean sand. For sand with fines (particles passing #200 sieve), an adjustment for the fines content (FC) is required. This adjustment beco...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2007
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| Online Access: | http://ndltd.ncl.edu.tw/handle/02533953732061722222 |
| Summary: | 碩士 === 國立交通大學 === 土木工程系所 === 96 === The simplified procedure commonly used for liquefaction potential assessment starts by considering the granular material as clean sand. For sand with fines (particles passing #200 sieve), an adjustment for the fines content (FC) is required. This adjustment becomes significant as the sands in South Western Taiwan usually contain high fines contents. The available schemes for fines content adjustment are highly empirical and may lead to different conclusions depending on the method chosen. Recent stduies have indicated that in using CPT for liquefaction potrential assessment, the fines content adjustment becomes important only when the fines start affecting the drainage condition in CPT. The objective of this research is to conduct a systematic evaluation on the CRR-qc releationship using available data from previous studies and from additional field tests as well as laboratory experiments on high quality samples taken from test sites. The author performed a series of CPT at test sites in Yuan Lin and Kao Hsiung. High quality silty sand samples were taken with a Gel push sampler at the Kao Hsiung test site. Results showed that there is indeed a general trend in CRR-qc releationship that for a given CRR the qc decreases with FC as suggusted by most of the existing simplified procedures. The CRR-qc releationship was however, much less sensitive to the fines content as what has been suggested. For CPT in natural alluvial soil, the drainage conditions are strongly influenced by the possible existence of thin layers of clean sand. It is suspected that these thin permeable layers caused the much reduced fines content effects on CPT in the silty sand mass.
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