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論文中文名稱:非飽和低塑性粉土/黏土剪力強度之探討 [以論文名稱查詢館藏系統]
論文英文名稱:Shear Strength of an Unsaturated Low Plasticity ML/CL Soil [以論文名稱查詢館藏系統]
院校名稱:臺北科技大學
學院名稱:工程學院
系所名稱:土木與防災研究所
畢業學年度:100
出版年度:101
中文姓名:曾煒迪
英文姓名:Wei-Di Tzeng
研究生學號:99428041
學位類別:碩士
語文別:中文
口試日期:2012-07-18
論文頁數:196
指導教授中文名:魏敏樺
口試委員中文名:吳博凱;盧之偉
中文關鍵詞:非飽和土壤三軸常吸力試驗三軸剪入滲試驗粉土/黏土
英文關鍵詞:unsaturated soilconstant suction shearing testshear-infiltration testML/CL
論文中文摘要:近年台灣因氣候變遷導致豪雨不斷,加上都市地區發展有限,逐漸向山坡地開發建設,以至於邊坡崩塌危及到人民安全之案例增多。民國97年9月28日,台北市文山區貓空纜車T16塔柱下方邊坡,在連日豪雨下發生山崩,影響到附近社區居民之安全。由於邊坡地表面與地下水位之間的土壤為非飽和狀態,當雨水從邊坡表面開始入滲到下層土壤時,會使得土壤含水量增加、基質吸力下降、孔隙水壓力上升,剪力強度減少,當土壤剪力強度降低到無法支撐土體自身重量和外加雨水重量時,易容易使邊坡沿著潛在破壞面發生崩塌行為。因此,在工程設計與防災設計時須考慮降雨入滲到非飽和土壤中對邊坡之影響。
本研究主要在探討貓空T16塔柱下邊坡之崩塌土層,在雨水入滲下對於邊坡非飽和粉土/黏土剪力強度之影響。本研究首先取得現地土樣,進行基本物理試驗與土壤水份特性曲線,瞭解土壤之物理性質與土壤在非飽和狀態下之基質吸力,並將現地擾動土樣製成重模試體,由一系列三軸試驗,如三軸常吸力(CD)試驗與三軸剪入滲試驗來獲得土壤力學性質參數與入滲行為下的破壞包絡面。
論文英文摘要:The increase of landslide events in recent years was mostly caused by heavy rainfall as a result of extreme climate change. On 28th September, 2008, a heavy rainfall led to the failure of the slope next to tower T16 of Maokong Gondola in the Wenshan District area of Taipei city. Water from the ground surface infiltrated into the initially unsaturated slope and caused its moisture content to increase and, subsequently, its matric suction to decrease. As a result, the shear strength of the slope dropped and thus triggered the landslide. It is thus important to consider the water infiltration effect during the design of slopes.
This study investigates the effect of water infiltration on the shear strength of unsaturated low plasticity ML/CL soil obtained from Maokong landslide. A series of laboratory tests including the physical test, soil water characteristic test and triaxial shearing test were conducted in order to understand the characteristics of the soil in an unsaturated condition. The shear strength obtained from the constant suction triaxial shearing test was then quantitatively compared with the shear strength obtained from the triaxial shearing-infiltration test. Their corresponding extended Mohr-Coulomb failure envelopes were then proposed.
論文目次:目 錄

中文摘要 i
英文摘要 ii
誌謝 iii
目錄 iv
表目錄 vii
圖目錄 ix
第一章 緒論 1
1.1 研究動機與目的 1
1.2 研究方法與內容 2
1.3 論文架構 3
第二章 文獻回顧 5
2.1 山崩機制 ( Landslide Mechanism ) 5
2.1.1 山崩的定義 ( Definitions of Landslide ) 5
2.1.2 山崩的分類 ( Landslide Types ) 5
2.2 非飽和土壤理論 6
2.2.1 非飽和土壤的定義 6
2.2.2 土壤水份特性曲線 7
2.2.3 非飽和土壤之剪力強度理論 11
2.2.4 臨界狀態理論 17
2.3 剪入滲試驗之相關研究 20
2.4 文山區崩塌案例與相關研究 23
2.4.1 文山區概況 23
2.4.2 崩塌案例 23
2.5貓空崩塌地之基本調查 25
2.5.1地形與地理位置 25
2.5.2 地質與地層概況 26
2.5.3雨量資料 27
第三章 試驗土樣、方法、設備與原理 49
3.1前言 49
3.2 土壤來源 50
3.3 三軸試驗儀器 50
3.4 三軸試驗準備 52
3.4.1 試驗方法 52
3.4.2 重模土樣 53
3.4.3 試體架設 54
3.5 三軸常吸力(CD)試驗 54
3.5.1 試驗步驟介紹 55
3.5.1.1 試體飽和 55
3.5.1.2 吸力平衡階段 56
3.5.1.3 試體壓密 58
3.5.1.4 試體剪切 58
3.6 三軸剪入滲試驗 58
3.6.1 試驗步驟介紹 59
3.6.1.1 應力水平 59
3.6.1.2 潛變監測 60
3.6.1.3 入滲 60
第四章 試驗結果與討論 76
4.1 基本物理試驗結果 76
4.2 土壤水份特性曲線 81
4.3 三軸試驗之壓密曲線 82
4.4 三軸常吸力(CD)試驗結果 83
4.4.1 三軸常吸力(CD)試驗之莫爾-庫倫破壞準則 85
4.4.2 三軸常吸力(CD)試驗之臨界狀態線 ( CSL ) 88
4.5 三軸剪入滲試驗結果 89
第五章 三軸剪入滲試驗之整合分析與探討 150
5.1 剪入滲與常吸力分析包絡面之比較結果 150
5.2 三軸剪入滲試驗之分析破壞包絡面 151
5.3 三軸剪入滲試驗之體積變化理論分析 153
5.4 三軸剪入滲試驗結果與體積變化理論之比較 155
第六章 結論與建議 173
6.1 結論 173
6.2 建議 174
參考文獻 175
附錄A.土壤基本物理試驗 181
附錄B.土壤水份特性曲線試驗 190
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論文全文使用權限:同意授權於2015-09-03起公開