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研究生:王正君
研究生(外文):Cheng-chun Wang
論文名稱:乾、濕化路徑與夯實狀態對土壤基質吸力之影響
論文名稱(外文):The Influence of Wetting-Drying and Compaction State on Matric Suction of Subgrade Soil.
指導教授:林宏達林宏達引用關係
指導教授(外文):Horn-da Lin
學位類別:碩士
校院名稱:國立臺灣科技大學
系所名稱:營建工程系
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:2008
畢業學年度:96
語文別:中文
論文頁數:140
中文關鍵詞:基質吸力乾濕化不飽和土壤夯實土壤
外文關鍵詞:Matric suctionWetting and DryingUnsaturated soilcompacted soil
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路基土壤屬於不飽和土壤,當受到自然界水循環產生乾、濕化路徑而改變路基土壤含水量,此現象往往會牽動內部基質吸力與土壤參數之改變。本研究利用廖志穎(2006)研製之濕化設備、程序及自行研製之乾化設備、程序進行含水量模擬,探討乾、濕化路徑引致之土壤吸力變化與土壤參數的關係。試驗結果顯示,濕化初期,土壤參數改變對土讓吸力有較大幅度之影響,達到平衡含水量後,影響趨於平緩。乾化過程則因含水量下降明顯使土壤參數迅速下降,土壤吸力因而急遽上升,此吸力急遽上升行為依據Vanapalli等人(1999)之定義應為「轉移階段」。利用本研究之試驗結果繪製土壤水分特性曲線,得知乾化之脫附曲線及濕化吸附曲線不是依循同一路徑改變,即可能為「遲滯效應」所影響。本研究針對不同夯實能量(修正、標準及縮減等夯實能量)之OMC試體所進行之試驗結果顯示,當含水量低於20%時,路基土壤吸力隨夯實能量增加而上升之趨勢相當明顯。
The subgrade soil was treated as unsaturated. When the subgrade soil is affected by the nature water cycle of wetting and drying, the water content of subgrade soil would be changed. This result often causes changes of the matric suction and soil parameters. The wetting apparatus developed by Liao(2006), and the drying apparatus developed in this study were used to conduct the water content simulation. The results were then used to study the relationship between the matric suction and the soil parameters under various wetting-drying paths. The results show more significant influence on the matric suction due to changes in soil parameter at the beginning of the wetting process. When the water content approaches the equilibrium moisture content, this influence becomes less significant. Upon drying, water content quickly to decrease causing significant changes in soil parameters and sudden increase in matric suction. This behavior fall in the transition zone defined by Vanapalli(1999). Test results of soil-water characteristic curves show that drying curve and the wetting curve do not follow at the same path, probably due to the “hysteretic effect”. This research also studied the effect of compaction energy(inclouding the modified、standard and reduced energy)on the matric suction. Test results show that when the water content is below 20%, matric suction of the subgrade soil clearly increase with compaction energy.
論 文 摘 要 I
致謝 IV
目錄 VI
表目錄 VIII
圖目錄 IX
第一章 緒論 1
1.1 研究背景與目的 1
1.2 研究內容 2
1.3 研究架構流程 3
第二章 文獻回顧 5
2.1 季節性環境變因對路基土壤含水量的影響 5
2.2 不飽和土壤性質 6
2.2.1 不飽和土壤有效應力 9
2.2.2 不飽和土壤應力狀態 11
2.2.3 土壤水份特性曲線 13
2.2.4 不飽和土壤吸力行為 17
2.3不飽和夯實土壤性質 23
2.3.1 夯實理論與工程性質 24
2.3.2夯實能量與夯實曲線 27
2.3.3夯實特性對土壤吸力影響 29
第三章 試驗土樣、儀器及研究方法 33
3.1 試驗計畫 33
3.2 試驗土樣基本物理性質 33
3.3 試體製作方式 35
3.3.1 標準夯實試驗 36
3.3.2 修正夯實試驗 37
3.3.3 縮減夯實試驗 37
3.4 路基土壤含水量狀態 39
3.4.1 路基土壤含水量模擬 40
3.4.2 路基土壤初始荷重狀態模擬 44
3.4.3 環境模擬設備及方法測試 45
3.4.4 乾化、濕化模擬程序 56
3.5 濾紙法量測土壤吸力 57
3.5.1 濾紙法試驗理論 59
3.5.2濾紙校正曲線 59
3.5.3 濾紙法試驗步驟 63
第四章 試驗結果之分析討論 66
4.1 含水量模擬測試結果 66
4.1.1 濕化路徑試驗設備測試結果 66
4.1.3 乾濕化路徑之試體含水量模擬結果 80
4.2 以濾紙法量測土壤吸力結果 98
4.3 乾、濕化路徑下土壤吸力與土壤參數之關係 99
4.4 不同夯實能量對路基土壤吸力之影響 127
第五章 結論與建議 131
5.1 結論 131
5.2 建議 134
參考文獻 136
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