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彰化地區工程地質對土壤液化和地層下陷的初步研究
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| 作者 |
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曾俊傑 |
| 學校系所 |
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國立臺灣海洋大學應用地球科學研究所 |
| 地點 |
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全臺 全部
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| 研究內容 |
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[中文摘要]
為探討彰化地區之土層的物理及力學性質，利用地質調查所於彰化地區所鑽的基礎鑽井岩心進行各項室內試驗，並使用SPT值及其他相關數據，分析彰化地區之土壤液化潛勢及其他相關力學性質，以了解彰化地區的工程地質特性。
研究結果發現土壤的特性和被液化的可能有很緊密的關係：顆粒愈大的〈例如礫土層〉，較不易被液化；密度愈大的〈例如泥層〉，也較不易被液化。
砂層 —河流沖積扇的主要產物，則成為主要的被液化土質。彰化地區北面大肚溪，南為濁水溪，是典型的河流沖積地層，也因此土壤液化成為人民生計所關切的問題。
台塑五輕曾經以土質改良的方法，成功地減少土壤被液化，未曾不是一個減災的好方法，但只能小範圍的選擇性的實施。
彰化地區，特別是濁水溪下游的濱海地區，超抽地下水，而造成嚴重的地層下陷。建議政府：適當管制地下水的抽取，以免造成地層下陷和土壤鹽化的困境。
中文關鍵詞：工程地質
[英文摘要Abstract]
In order to study the soil physics and dynamics, we apply the drilling data from the Central Geological Survey and conduct several laboratory tests. The SPT values and several related digital results form a critical point to understand the soil liquefaction and other engineering geology of the Changhua area.
The results suggest that the soil characteristics and liquefaction have strong relationships: the bigger the grain size (such as the gravel), the less is liquidated; the bigger the density (such as the mud), the less is liquidated. The sand, a typical product of river sedimentary fan, becomes a major area of soil liquefaction. In the Changhua study area, it has the Ta-Do River in the north and the Tso-Sui River in the south. Naturally it is a sedimentary fan, hence, a candidate region for soil liquefaction.
The Tai-Plastics has successfully applied a soil compaction method to reduce the chance to be liquidated. However, it is difficult to apply the whole area to be compacted. Therefore, the study of soil physics and dynamics become a necessary way to understand the problem.
Keywords：engineering
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