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題名 | 宜蘭地區地質概論與土層特徵=Geological Condition and Soil Characteristic of Ilan Area |
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作者姓名(中文) | 趙紹錚; 周銘瑋; 徐瑩潔; | 書刊名 | 宜蘭大學工程學刊 |
卷期 | 5 2009.03[民98.03] |
頁次 | 頁1-16 |
分類號 | 441.103 |
關鍵詞 | 宜蘭; 蘭陽平原; 大地工程分區; 地質; 土層; 土壤液化; 壓密沉陷; Ilan; Lanyang Plain; Geotechnical engineering zone; Geological condition; Soil Characteristic; Soil liquefaction; Consolidation settlement; |
語文 | 中文(Chinese) |
中文摘要 | 國道5號北宜高速公路於2006年6月16日全線通車後,宜蘭地區各項重大工程之建設紛紛展開,本區域之地質概況與土層特徵值得加以研究探討。宜蘭地區就地質上來說,可以分為雪山山脈區、中央山脈區和蘭陽平原區。宜蘭縣內西北部之雪山山脈區地層主要包括西村層、四稜砂岩、乾溝層及大桶山層;縣內南部之中央山脈區地層主要包括西村層、廬山層、大南澳片岩及南蘇澳層;蘭陽平原區以蘭陽溪沖積扇為主,主要是由粘土、粉土、砂土及礫石所組成。本研究經由蒐集宜蘭地區鑽探資料,加以統計分析並與相關研究成果比較,以探討本地區表層土壤工程特性。研究成果顯示蘭陽平原之地下土層性質,主要由粉黏土層與粉土質砂層交互沉積的沖積層所組成。其中砂土層之顆粒級配偏於均勻,SPT-N值亦不高,顯示地下土層為疏鬆至中等緊密狀態,加上地下水位相當接近地表面,應預防地震產生之土壤液化災害;宜蘭地區之頭城區、礁溪區、宜蘭壯圍區、五結區、羅東冬山西區、羅東冬山東區、及蘇澳區有軟弱黏土層,則應注意新建結構物產生之壓密沉陷相關課題。未來宜蘭地區勢將持續蓬勃發展,各分區地質概況與土層特性若能持續研究探討,對於宜蘭地區之工程建設、地質災害防治、及土地利用皆有莫大幫助,本初步成果之發表期能成為相關研究之濫觴。 |
英文摘要 | After the National Highway No.5, the Taipei-Ilan Expressway, began to serve on June 16th, 2006, a lot of construction projects in Ilan area have been launched. The geological condition and soil characteristic of Han area are thus worthy to study in detail. Han area, on the geological point of view, can be divided into the Snow Mountain Range, the Central Mountain Range, and the Lanyang Plain Area. The Snow Mountain Range, which is located in the northwest region of Han County, consists of Hsitsun Formation, Szeleng Sandstone, Kangkou Formation, and Tatungshan Formation. The Central Mountain Range in the southern region of Han County consists of Hsitsun Formation, Lushan Formation, Tananao Schist, and NanSuao Formation. The Lanyang Plain Area based on the Lanyang River alluvial deposit is mainly composed of clay, silt, sand, and gravel. This study is carried out by collecting the Ilan area's boring data and followed by performing statistical analysis. The results are compared with the associated studies in order to explore the soil characteristic of surface layers for the study area. Research results show that the subsurface deposits of the Lanyang Plain mainly are structured with the silty sand layer and the silt/clay layer of alluvial deposition. The particle size distribution of sand layer is quite uniform while the SPT-N value is fairly low. Therefore, the density of the sand strata should be in loose to medium condition, the water table very close to the ground surface as well. As a result, it is necessary to consider for prevention of earthquake and soil liquefaction disaster. Besides, Toucheng area, Jiaosi area, Ilan-Jhuangwei area, Wujie area, Western Lotong-Dongshan area, Eastern Lotong-Dongshan area, and Suao area have weak clay layers, which are likely accompanied with consolidation settlement due to the loadings come from the new structures. The Han area is bound to develop rapidly in the near future. Therefore, the study on geological condition and soil characteristic of Han area is supportive for the construction projects, the geological disaster prevention, and the land use purpose. The proposed preliminary result of this study is considered to make the first move for the associated study. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。