| Summary: | 碩士 === 中原大學 === 土木工程研究所 === 97 === This study is a critical evaluation of drilled shafts under axial and lateral loading in gravelly soils. Both interpretation criteria and analysis methods are examined using field load test data. Available interpretation criteria are used to establish a consistent axial and lateral interpretation criterion. The β method, general bearing capacity equation, and SPT-N empirical equation are evaluated for axial capacity, while the simple Chang method is used for lateral capacity.
Based on these analyses, QL1 is close to load at 0.31%B with 2.6 mm and QL2 is close to load at 18.4 mm for uplift loading. QL1 is close to load at 0.54%B with 7.2 mm and QL2 is close to load at 52.1 mm for compression loading. Among all axial interpretation criteria, the Davisson method gives the lowest results and Chin method has the highest results. For lateral loading, QS&W is close to Q0.75%B and Q10.0mm, while QL is close to Q1.2%B and Q11.4mm.
For the analysis of axial capacity, the side resistance of β method is generally underestimated and the general bearing capacity equation is overestimated. The suggested SPT-N empirical equations were also evaluated using measured results. For lateral capacity, the statistical data show that the larger the lateral displacement, the closer the results between measurements and simple Chang method. Finally, specific design recommendations for the interpretation and capacity analysis are given.
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