| Summary: | 碩士 === 國立成功大學 === 土木工程學系碩博士班 === 97 === SPT and CPT are typical penetrating techniques that have been widely used. However, those tests must be associated with large facilities and high costs. Therefore, DCPT is a testing technique with short test period, light weight of equipments, and low cost. The DCPT-Nd obtained during the DCPT test is a continuous data to improve the discontinuous SPT-N. Meanwhile, a specified sampler can be applied to have in-situ soil samples and is different from the CPT that unable to have in-situ sample. Thus, the DCPT can be a useful tool for the numerous geologic detections at the shallow depths.
In addition, soil classification provides a fundamental data for the design in geotechnical engineering. Therefore, in this study, the DCPT-based soil classification is conducted by point out the relationship between DCPT-Nd and the CPT-qc and CPT-fs at the adjoining CPT borehole. The CPT-based soil classification is used for soil classification and is verified by the sampled soils at the adjoining borehole.
The investigated data come from the DCPT boreholes adjoining to each of the 14 SPT and CPT boreholes in Tainan, National Cheng Kung University campuses, and the Changhua coastal industrial park. The DCPT-Nd decreases as the increasing depth above the ground water table. Oppositely, DCPT-Nd increases as the increasing depth below the ground water table.
Then, we found that the DCPT investigated soils are classified in the 6th zone (sands) and 5th zone (sand mixtures) based on applying the DCPT-qc and DCPT-fs to the Robertson soil classification method. In addition, the soils taken from the adjoining borehole are identified to be SP-SM and SM based on the USCS. The classification results correlate well with the soil in the zones of 6th and 5th of the Robertson soil classifications.
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