| Summary: | 碩士 === 淡江大學 === 土木工程學系碩士班 === 94 === This research integrates the borehole data of the south-west coastal area of Taiwan to analyze soil properties. First, this borehole data estimates the soil properties of the south-west coastal area in Taiwan with space Interpolation. Second, it’s easier to realize the distribution of soil engineering properties with the method of transferring SPT-N value to Engineering parameters by empirical formula. In addition, we can discriminate soft ground from south-west area of Taiwan with several criterion of soft ground. Most of all, this study combines SPT-N value, water content, and thickness of soft soil, three criterion, to classify ground based on different level of soft soil. As a result, it leads to new pictures of different level of soft ground for reference.
The following are the main result:
(1) The borehole data of this study indicates its rough distribution of Taiwan as below: Changhua and Yunlin are well mixed; Chiayi, Tainan, Kaohsiung, and Pingtung are concentrated on coastal area; Taichung on south area.
(2) We can tell where the soft ground is quickly by SPT-N value only, but it’s still not precise.
(3) The area with landform changes have these three characteristics: lower SPT-N value, higher water content, and the thickness of soft ground.
(4) The majority of SPT-N values of soil in alluvium are smaller than ten, or even lower than four. That means the soil in alluvium is extremely soft.
(5) This research is of great worth for combining with three criterion of soft ground, SPT-N value, water content, and thickness of soft soil to analyze the ground of two towns (Mailiao and Tuku) of Yulin and verify the soft ground level correspond to actual situation absolutely.
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