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研究生:吳正川
論文名稱:地層沈陷量預測
論文名稱(外文):A study on the ground settlement prediction
指導教授:陳廣祥陳廣祥引用關係
學位類別:碩士
校院名稱:逢甲大學
系所名稱:土木及水利工程研究所
學門:工程學門
學類:土木工程學類
論文種類:學術論文
論文出版年:2001
畢業學年度:89
語文別:中文
論文頁數:124
中文關鍵詞:沈陷量雙曲線液化
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本文將土層的即時沈陷、壓密沈陷、二次沈陷歸納至靜態沈陷,地震或反覆應力作用導至的液化後沈陷視為動態沈陷。地層下陷對國家水土資源來說是一種極大的損失,台灣地區之地層下陷首先發生於台北盆地(曹以松,1989),隨後屏東、雲林、彰化相繼發生,甚至東部宜蘭亦發生了嚴重地層下陷。故如何去預測及預防是相當重要的課題。
儘管Terzaghi(1943)及Biot(1940)靜態沈陷的理論已臻至完善,然而較深層的土層礙於經費,造成諸多相關參數不易獲的,使得一些下陷評估無法正確運作,因此本研究採用張惠文等人(1996)等人雙曲線的數學模式進行地層下陷的預測探討,評估結果顯示在沈陷量趨於穩定與地表回漲量小的區域,雙曲線預測法有不錯成效。
動態沈陷方面,液化潛能的評估的相關研究可以說是不勝枚舉,但液化後沈陷的評估國內目前較少,可是其釀成的災害卻不下因超抽地下水造成的靜態沈陷(紀雲曜,1997)。本文採用日本學者Ishihara & Yoshimine(1992)的評估方法配合紀雲曜(1997)的程序化,藉由嘉義布袋港的評估,結果發現動態沉陷不會隨地表加速度的增加而無限增加。
In this study, the ground settlement is divided into two categories including static settlement and dynamic settlement. Static settlement is composed of immediate settlement, consolidation settlement as well as settlement due to secondary compression of soils. The settlement resulted from the liquefaction of ground during earthquake or as a result of cyclic stress is known as dynamic settlement. In our country, ground settlement has been occurred in several areas such as Taipei basin, Pingtung, Yunlin, Changhua, and Ilan. Our country has been suffered from a tremendous loss of ground settlement. It is one of our major tasks to effectively predict the amount of ground settlement as well as to prevent the occurrence of ground settlement.
In this study, a hyperbolic prediction model proposed by Chang, Hui-Wen and his co-researchers (1996) was employed to predict the amount of static ground settlement. This method requires only the previous relation of time and ground settlement. This method enable to avoid the difficulty in obtaining suitable soil parameters needed in the analysis of many other methods. The results of calculation indicate that this model is able to predict appropriately the amount of static ground settlement to be occurred in the near future except there is tremendous change of settlement as well as ground swelling.
In the calculation of dynamic settlement due to soil liquefaction, a method proposed by Ishihara and Yoshimine(1992) in conjunction with a procedure of calculation proposed by Chi, Yun-Yao (1997) was used. A study of dynamic settlement of PuTai Harbor at ChiaI was performed. It was found that the dynamic ground settlement increases with the increase of ground acceleration to a limited amount.
目錄
誌謝 I
目錄 II
圖目錄 V
表目錄 VII
符號說明 IX
中文摘要 XII
英文摘要 XIII
第一章緒論 1
1-1前言 1
1-2研究主旨 2
1-3論文內容 2
第二章相關研究與文獻回顧 7
2-1 前言 7
2-2 沈陷的分類 7
2-3 地層下陷相關研究 9
2-3.1 土壤壓密理論 9
2-3.2地層下陷之數學預測法 11
2-3.2.1雙曲線測定法 11
2-3.2.2 Hoshino(星野)氏測定法 11
2.3.2.3 Asaoka(淺岡)氏測定法 12
2-3.2.4 Takeshima(竹島)氏半對數測定法 12
2-4 液化之定義及機制 12
2-4.1 液化定義 12
2-4.2 液化機制 13
2-5液化潛能評估法 14
2-5.1 簡易準則分析法 14
2-5.2 總應力分析法 15
2-5.3 有效應力分析法 15
2-5.4 簡易計算分析法 16
2-6 各種簡易計算分析法 16
2-6.1 Seed簡易經驗法 16
2-6.2 Tokimatsu 與Yoshimi 簡易法 24
2-6.3日本道路橋簡易經驗法 27
2-7 液化後的體積應變 30
第三章研究原理 32
3-1 前言 32
3-2 雙曲線測定法 32
3-3 液化後地層下陷探討 34
3-3.1 Ishihara液化後沈陷評估方法 34
3-3.2 紀雲曜(1997)液化後分析流程 39
3-3.2.1 模式推導 39
3-3.2.2 分析步驟 44
第四章研究實例與結果討論 46
4-1 前言 46
4-2靜態沈陷探討 46
4-2.1 成功案例 46
4-2.2 失敗案例 47
4-3 動態沈陷探討 60
4-3.1 布袋港之概況 60
4-3.2 布袋港液化後沈陷評估 60
第五章結論與建議 100
5-1 結論 100
5-2 建議 101
參考文獻 102
附錄A 靜態分析資料 106
附錄B 靜態分析資料 115
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