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題 名 | Calibration of Cone Penetration Test in Sand=圓錐貫入試驗在砂土中之標定 |
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作 者 | 許懷後; 黃安斌; | 書刊名 | Proceedings of the National Science Council : Part A, Physical Science and Engineering |
卷 期 | 23:5 1999.09[民88.09] |
頁 次 | 頁579-590 |
分類號 | 441.12 |
關鍵詞 | 圓錐貫入試驗; 砂土; 標度試驗; 現地量測; Cone penetration test; Sand; Dilatancy; Stress state; Calibration chamber test; |
語 文 | 英文(English) |
英文摘要 | Due to its simplicity, the cone penetration test (CPT) is a popular in- situtesting method. CPT is especially desirable in characterizing sand where it is difficult to obtain undisturbed samples. Because of the large strain which occurs during a cone penetration, theoretical analysis of CPT results has been difficult and,hence, limited. Accordingly, interpretation of CPT data is mostly based on empirical correlations. Some of the empirical correlations are based on CPT in the calibration chambers. An important drawback of interpreting CPT in a calibration chamber is its boundary effects. Correction factors have been proposed to account for these boundary effects. However, the validity of the use of correction factors and the mechanisms of boundary effects have not been independently verified. The authors have developed an axisymmetric field simulator in which CPT calibration tests can be conducted under substantially reduced boundary effects. A series of CPT calibration tests has been performed in the new simulator system to correlate the cone tip resistance (qc) with the stress state. Results show that the correlation of qc and the initial effective mean normal stress (prior to cone penetration) is clearer than the other components of the initial stress state. However, under the same initial effective mean normal stress, qc has a consistent localized relationship with the initial horizontal stress. qc is affected by the horizontal stress near the cone tip, where there exists an obvious correlation between them. This paper introduces chamber calibration tests of CPT, describes this new field simulator system, presents available CPT data obtained using the new simulator and discusses the stress state affected qc values. |
本系統中英文摘要資訊取自各篇刊載內容。