現在位置首頁 > 博碩士論文 > 詳目
  • 同意授權
論文中文名稱:不飽和土壤壓密之數值分析 [以論文名稱查詢館藏系統]
論文英文名稱:Numerical Analysis of Consolidation of Unsaturated 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:102
出版年度:103
中文姓名:莊勝傑
英文姓名:So ShoKetsu
研究生學號:101428033
學位類別:碩士
語文別:中文
口試日期:2014-07-30
論文頁數:129
指導教授中文名:魏敏樺
指導教授英文名:Gui, Meen-Wah
口試委員中文名:張榮峰;盧之偉
口試委員英文名:Jung-Feng.Chang;Chih-Wei LU
中文關鍵詞:不飽和土壤壓密數值分析真空加載
英文關鍵詞:Unsaturated soilconsolidationNumerical analysisVacuum consolidation
論文中文摘要:至今飽和土壤一維壓密的經典理論已有相當成熟技術發展與應用,並且成功解決關於地工結構物加載所產生的地表沈陷問題。也有些許關於不飽和壓密試驗的研究,但對於使用分析軟體來探討實際不飽和壓密問題卻不多。本研究為驗證Dakshanamurthy et al. (1984)的不飽和壓密方程,驗證後再進行前人的不飽和土壤壓密行為之K_0壓密試驗模擬。K_0壓密試驗是將常含水量試驗、壓密試驗,增加基質吸力試驗相互串連循環而成,可探討基質吸力與垂直載重交互作用下之情況以及不飽和紅土K_0壓密時之水體積、土體積變化。之後進行真空預壓密案例分析,此部分分析包括飽和及不飽和之沉陷量比較,另外針對各種不同地下水位之沉陷量比較以及各種不同土壤之沉陷量比較。分析結果顯示不飽和壓密方程式會與固體力學產生耦合效應,因此可模擬出超額孔隙水壓之消散趨勢以及土壤沉陷量之變化。在不飽和土壤K_0壓密分析中也可使用不飽和壓密方程來模擬土、水體積之變化、壓密係數等變化。
論文英文摘要:The classical one-dimensional consolidation theory for saturated soil has brought many successful applications in geotechnical engineering practice especially those related to consolidation settlement. The theory is not suitable for unsaturated soil application as the volume change of the soil mass and water volume are not considered. This study verifies the consolidation theory for unsaturated soil that was proposed by Fredlund and Hasan in 1979. Results from an analytical study and experimental test of one-dimensional consolidation test on unsaturated soil specimen were used for the verification study. Finally, the application of the unsaturated consolidation theory on a preloading consolidation case was also performed.
論文目次:目錄
中文摘要 i
英文摘要 iii
致 謝 iv
目 錄 v
表目錄 viii
圖目錄 ix
第一章 緒論 1
1.1研究動機與目的 1
1.2 研究內容與方法 2
1.3 章節內容概述 2
第二章 文獻回顧 4
2.1 前言 4
2.2不飽和土壤組成 5
2.3基質吸力之理論 6
2.4土水特徵曲線 7
2.5儲水方程式與水力傳導方程 9
2.6不飽和土壤之應力應變狀態 11
2.7不飽和土壤之體積變化 14
第三章 數值分析與驗證 21
3.1 前言 21
3.2不飽和壓密偏微分方程式 21
3.2.1不飽和壓密偏微分方程式(液相) 22
3.2.2不飽和壓密偏微分方程式(氣相) 23
3.2.3不飽和土壤之體積變化與壓縮姓 24
3.3固體力學 26
3.4有效應力 28
3.5幾何方程 29
3.6邊界條件 33
3.7不飽和壓密分析之驗證 34
3.7.1超額孔隙水壓及氣壓之消散結果 34
3.7.2不同z/H情況下之消散趨勢 35
3.7.3不同ka/ks情況下之土壤沉陷 36
3.7.4探討不飽和參數 36
第四章 不飽和壓密試驗模擬 57
4.1 前言 57
4.2不飽和K0壓密試驗流程 58
4.3不飽和K0壓密數值分析流程 59
4.4不飽和K0壓密數值分析之方程式 60
4.4.1 液相及氣相之不飽和滲流偏微分方程式 61
4.4.2不飽和土壤之體積變化與壓縮姓 62
4.5水相壓密係數與不飽和滲透係數 63
4.6水體積變化係數m2w與土體積變化係數m2s 65
4.7孔隙比變化趨勢之分析結果 66
4.8不飽和K0壓密試驗分析之靜止土壓力係數 67
4.9增加基質吸力試驗之分析結果(M 試驗) 68
4.10常含水量試驗(CW 試驗)之分析結果與孔隙水壓參數 68
4.11壓密試驗(C 試驗) 69
第五章 不飽和土壤之真空壓密 98
5.1真空壓密之機制 98
5.2案例介紹 98
5.3 Biot飽和壓密控制方程 99
5.4 Biot壓密分析之結果 99
5.5不飽和壓密分析之結果 100
5.6飽和與不飽和之沉陷量比較 100
5.7不飽和真空壓密之不同土壤沉陷量比較 101
第六章 結論與建議 121
6.1 結論 121
6.2 建議 122
參考文獻 123
論文參考文獻:Ashraf, S.O. (2014). “Comparison between coupled and uncoupled consolidation analysis of a rigid sphere in a porous elastic infinite space.” Journal of Engineering Mechanics – ASCE.
ASTM D6836-02. (2010). “Standard Test Method for Determination of the soil water characterisitic curve for desorption using a hanging column, pressure extractor, chilled mirror hygrometer, and/or centrifuge.” West Conshohocken. Pa.
Biot, M. A. (1941). “General Theory of Three-Dimensional Consolidation.” J.Appl. Phys., 12(2), 155-164.
Bishop, A.W (1959). “The Principle of Effective Stress.” lecture delivered in Oslo, Norway, in 1955; published in Teknisk Ukeblad, vol.106, no.39, pp.859-863.
Chai, J., Carter, J. P., & Liu, M. D. (2013). “Methods of vacuum consolidation and their deformation analyses. “ICE Publishing.
Dakshanamurthy, V., Fredlund, D. G, Rahardjo, H. (1984). “Coupled Three-Dimensional Consolidation Theory of Unsaturated Porous Media.” Preprint of Papers: 5th Int. Conf.Expansive Soils, Institute of Engineers, Australia, May 1984, pp.99-104.
Fredlund, D. G., & Morgenstern, N. R. (1976). “Stress state variables for unsaturated soils.”Journal of the Geotechnical Engineering Division, 103(5), 447-466.
Fredlund, D. G., & Rahardjo, H. (1993). “Soil mechanics for unsaturated soils .”,Wiley-Interscience.pp.441.
Fredlund, D. G, Xing, A. (1994). “Equations for the soil-water characteristic curve.” Canadian Geotechnical Journal, 31(4), 521-532.
Gareau, F., and Molenkamp, F., and Sharma, J. (2006). “An Improved Oedometer Apparatus to Measure Lateral Stress during Testing.”Geotechnica Testing Journal, 29(3).
Gardner, W. R. (1958). “Some steady state solution of the unsaturated moisture flow equation with application to evaporation water table.”Soil Science, 85(4), 228-232.
Hotlz R. D., and William, D. K. (1981). “An Introduction to Geotechnical Engineering. Englewood Cliffs. ”
Leong, E. C., & Rahardjo, H. (1997). “Review of soil-water characteristic curve equation.” Journal of Geotechnical and Geoenvironmental Engineering, 123(12).
Linchang, M., Yaiyn, Z., Fei, W., Xiaojun, Y., (2011). “Prediction of Land Subsidence using a Proposed Consolidation-Seepage-Creep Couping Model.” Geo-Frontiers.
Lu, N., & Likos, W. J. (2004). “Unsaturated soil mechanics John Wiley and Sons.”
Qin, A., (2008). “Amalytical solution to one-dimensional consolidation in unsaturated soils.”
Rahardjo, H., & Fredlund, D. G. (1995). “Experimental verification of the theory of consolidation for unsaturated soils.” Canadian Geotechnical Journal, 32, 749-766.
Shan, H.Y, and Lin, H.H., and Lien, J.Y. (2003). "Pore Pressure Coefficients of Unsaturated Soil." The 10 th Conference on Current Researches in Geotechnical Engineering in Taiwan.
Shan, Z., Ling, D., & Ding, H. (2003). “Exact solutions for one-dimensional consolidation of single-layer unsaturated soil.” Journal for Numerical and Analysis Methods in Ceomechanics.
Terzaghi, K. (1925) “The Shear Resistance of Saturated Soils.” In Proc.1st Int.Conf. Soil Mech. Found. Eng.(Cambridge,MA), pp 54-56
Van Genuchten, M. T. (1980). “A closed-equation for predicting hydraulic conductivity of unsaturated soils.” Soil Science Society of America Journal, 44(5),
Vanapalli, S. K., Fredlund, D. G., and Pufha, D. E. (1999). "The influence of soil structure and stress history on the soil-water characteristics of a compacted till." Geotechnique, 49(2), 143-159
Vu, H. Q. (2002). “Uncoupled and coupled solutions of volume change problems in expansive soils.” Ph.D. Dissertation, University of Saskatchewan, Sakatoon.
陳家豪. (2009). “非飽和紅土K_0壓密行為之研究.” 碩士論文, 國立台北科技大學土木防災所, 台北.
廖南華. (2003). "土壤經驗參數於數值分析之應用". 碩士論文. 國立成功大學土木工程研究所, 台南.
論文全文使用權限:同意授權於2016-08-28起公開