跳到主要內容

臺灣博碩士論文加值系統

(44.192.38.49) 您好!臺灣時間:2023/02/01 13:11
字體大小: 字級放大   字級縮小   預設字形  
回查詢結果 :::

詳目顯示

: 
twitterline
研究生:江敏吉
論文名稱:超載對打設排水帶後軟弱地盤壓密行為之影響
指導教授:張惠文張惠文引用關係
學位類別:碩士
校院名稱:國立中央大學
系所名稱:土木工程研究所
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:2000
畢業學年度:88
語文別:中文
論文頁數:96
中文關鍵詞:超載排水帶次壓縮殘餘沉陷
外文關鍵詞:surchargeplastic board drainsecondary compressionresidual settlement
相關次數:
  • 被引用被引用:1
  • 點閱點閱:332
  • 評分評分:
  • 下載下載:25
  • 收藏至我的研究室書目清單書目收藏:0
本研究探討土體受超載後之壓密行為,包含殘餘沉陷量的比較及次壓縮之變化情形,而排水帶對促進土體壓密沉陷之影響亦將在此作一研究。最後,由室內試驗之結果將與大型土槽之沉陷量監測結果作一驗証比較,以瞭解室內試驗值與接近現地情況之量測值間的差異。
試驗結果顯示,超載移除後能抑制土體次壓縮的產生,且超載越大或超載作用時間越長,越能抑制次壓縮以減少土體的殘餘沉陷量。一般而言,土體在次壓縮階段的變形與對數時間為線性的關係,因此次壓縮指數C為一常數,並用以計算土體次壓縮沉陷量,但試驗中俟超載移除後土體之次壓縮指數C不再為一常數,其值將隨時間而有增加之趨勢,因此,對超載移除後之沉陷量的概算工作,可利用次壓縮沉陷曲線中一另行定義的次壓縮指數C進行之。若另於試驗土體內打設排水帶以促進壓密時,則對其沉陷行為有何影響亦為本研究探討之重點。
於大型土槽的超載試驗部分,將土槽劃分為打設排水帶區與無排水帶區等兩區,以比較排水帶加速土層壓密之效能,而經歷約450天的沉陷量監測後,開始將屬於超載的0.5公尺高之回填砂移除,剩餘之1公尺高的回填砂則視為作用於土層上之結構荷重,並將繼續對土層受此結構荷重下之沉陷量作監測工作,以觀察超載移除後土層次壓縮之變化情形,而綜合各項試驗結果顯示,室內試驗值與大型土槽的量測值間之差異不至於過大。
The research investigated the consolidation behavior of soft clay after subjected to a surcharge load, included the comparison of residual settlements and the secondary compression. Besides, the plastic board drain accelerate the consolidation of clay were also investigated here. Finally, the results of laboratory experiments were compared with the settlement monitoring results of indoor pit test.
The test reveals that as the magnitude of simulated surcharge stress increases, the time interval following removal of the surcharge load during which little secondary compression occurs also increases, and when secondary compression reappears, the coefficient of secondary compression Cα decreases. For most practical purposes a constant Cα with time can be used to compute secondary compression settlements. Postsurcharge secondary compression index, Cα, always increases with time. A secant postsurcharge secondary compression index, Cα, is therefore introduced for a simple computation of secondary compression settlements.
In the indoor pit test, the pit were divided into two zones, with or without installing plastic board drain, which compared the consolidation behavior accelerated by plastic board drain on soft clay. After 450 days settlement monitoring work, removed the 0.5m of surcharge fills and left the 1m of fills which were considered as the permanent load. Then, the settlement monitoring work were continued, and no apparent settlement occurred. The test results indicated that the values between laboratory experimental results and the indoor pit test results make few differences.
目 錄
申文摘要 I
英文摘要 II
目錄 III
圖目錄 VII
表目錄 X
照片目錄 XI
符號說明 XII
第一章 緒論 1
1-1 前言 1
1-2 研究動機與目的 1
1-3 研究方法 2
1-4 論文內容 3
第二章 文獻回顧 4
2-1 土壤的預壓 4
2-2 土壤預壓的目的 5
2-3 超載工法的考量因素 5
2-3-1 壓密係數 5
2-3-2 次壓縮的探討 6
2-4 超載對土壤壓密沉陷的加速作用 7
2-4-1 以超載消除結構物的主壓密沉陷 7
2-4-2 超載對次壓縮沉陷的局部消除 8
2-4-3 回脹後再次出現的壓縮沉陷 9
2-5 超載與垂直應變的關係 9
2-6 超載對土層有效應力的提昇 12
2-7 超載移除後土層之回脹分析 12
2-7-1 土壤回脹參數 13
2-7-2 二次回脹指數 13
2-7-3 和時間有關的膨脹速率分析 14
2-8 徑向壓密理論 15
2-8-1 Barron壓密理論 15
2-8-2 Kjellman壓密理論 17
2-8-3 Hansbo壓密理論 18
2-8-4 徑向壓密理論探討 18
2-9 排水帶幾何因子轉換 19
第三章 試驗材料、儀器設備及試驗方法 29
3-1 試驗土樣與材料 29
3-1-1 試驗土樣 29
3-1-2 排水帶 30
3-2 試體之準備與製作 30
3-2-1 重模土樣之前置處理 30
3-2-2 重模土樣之製作 31
3-3 試驗儀器及設備 31
3-3-1 中型壓密儀 32
3-3-2 單向度壓密試驗儀 32
3-3-3大型土槽 32
3-4 研究方法與試驗規劃 33
3-4-1 單向度壓密試驗 34
3-4-2 小尺度模型試驗 34
3-4-3 大尺度模型試驗 35
3-5 側壁摩擦力對小尺度模型試驗影響之評估 35
3-6 試驗方法與步驟 36
3-6-1 小尺度模型試驗之試驗方法 36
3-6-2 大尺度模型試驗之試驗方法 36
第四章試驗結果與分析53
4-1 側壁摩擦力對土壤壓密的影響探討 53
4-1-1側壁摩擦力對應力傳遞的影響 53
4-1-2側壁摩擦力對土壤壓密沉陷的影響評估 54
4-2 排水帶之室內實驗值與理論值探討 55
4-2-1 室內試驗之土壤參數 55
4-2-2 Barron排水理論探討 56
4-3 超載與排水帶對殘餘沉陷的影響 58
4-3-1 中大紅土的殘餘沉陷分析 59
4-3-2 台北沉泥的殘餘沉陷分析 61
4-3-3 超載與排水帶對土體壓密行為的關係 62
4,4 超載與垂直排水帶對次壓縮的影響 62
4-4-1 中大紅土的次壓縮分析 63
4-4-2 台北沉泥的次壓縮分析 63
4-4-3 超載比R,與次壓縮指數的關係 64
4-4-4 超載移除後的次壓縮沉陷量計算
4-5 大尺度模型試驗之試驗結果 66
4-5-1 大尺度模型試驗說明 66
4-5-2 大型土槽沉陷監測結果分析 67
4-5-3 大尺度模型之次壓縮分析
第五章結論與建議 88
5-1 結論 88
5-2 建議 90
參考文獻 91
[1]. 張惠文,「垂直砂樁排水法之有效性與改良效果」,地工技術雜 誌,第八期,第44-50頁(1985)。
[2]. 姚義久,「軟弱土層處理-垂直排水法(一)」,現代營建,第39期, 第45-57頁(1983)。
[3]. 姚義久,「軟弱土層處理-垂直排水法(二)」,現代營建,第40期,第57-65頁(1983)。
[4]. 姚義久,「軟弱土層處理-垂直排水法(三)」,現代營建,第41期,第67-73頁(1983)。
[5]. 陳金溪、劉世祐、李文郁、田俊銘,軟弱地盤改良研究,中華工程公司嘉南開發所,第58-104頁(1985)。
[6]. 蘇鼎鈞、魏文德、楊財欽、陳世浩,「基隆河舊河道垂直排水帶現場試驗和成效評估」,地工技術雜誌,第51期,第79-90頁(1995)。
[7]. 許文斌,「垂直排水帶工法在國內應用之探討」,現代營建,第106期,第29-40頁(1988)。
[8]. 稻田倍穗,軟弱地盤之土質工學,鹿島出版社,第326-329頁(1981)。(日文)
[9]. 劉維斌,「軟弱地盤打設排水帶後之壓密行為」,碩士論文,國立中央大學土木工程研究所,中壢 (1998)。
[10]. 廖健智,〝垂直排水帶壓密特性與潛變排水量之室內試驗研究〞,私立中原大學土木工程研究所,中壢(1990)。
[11]. 賴世屏,「垂直排水帶壓密行為預估與檢討」,碩士論文,私立淡江大學土木工程研究所,台北(1990)。
[12]. 陳成,「垂直排水帶縱向透水能力之相關行為探討」,碩士論文,私立中原大學土木工程研究所,中壢 (1994)。
[13]. 聶豫珍,「垂直排水帶加速壓密行為之探討」,碩士論文,私立中原大學土木工程研究所,中壢(1995)。
[14]. 陳弘益,「黏土層中排水砂樁之研究」,碩士論文,國立成功大學土木工程研究所,台南 (1997)。
[15]. 王傳奇、鄭智元、劉福生、吳青昆,「地盤改良對新生地儲槽沉陷之影響」,地工技術雜誌,第66期,第47-54頁 (1998)。
[16]. Akagi,T., Effect of displacement type sand drains on strength and compressibility of soft clays. Publications Dept. of Civil Eng’g Tokyo Univ., Japan, pp.403-415 (1977).
[17]. Atkison, M. S. and Eldred, J. L. “Consolidation of Soil Using Vertical Drains,” Vertical Drains, Thomas Tedford. Ltd., London. 198, pp.233-244 (1981).
[18]. Barron. R. A., “Consolidation of Fine Grained Soils by Drain Wells,” Tans., ASCE, Vol.113, pp.718-754 (1948).
[19]. Bergado, D.T. Investigations of effectiveness of flodrain vertical drains on ‘undisturbed’ soft Bangkok Clay using laboratory model test. Report submitted to General Engineering Ltd., Bangkok, Thailand, and Geosynthetics Department Nylex (Malaysia) Berhad, Malaysia (1992).
[20].Bergado,D. T., H. Asakami, M.C. Alfaro & A.S. Balasubramaniam, Smear effects of vertical drains on soft Bangkok Clay. J. Geotech. Eng’g. Div. ASCE 117,10: 1509-1530 (1991).
[21]. Berre, T., and Iversen, K.,“Oedometer tests with different speciment heights on a clay exhibiting large secondary compression,”Ge'otechnique, Vol. 22, No. 1, pp. 53-70 (1972).
[22]. Burwash, W. J.,and Matich, M. A.,“Stage loading of a highway embankment on tidal flats,” Can. Geotech. J., Vol. 18, No. 4, pp. 535-542 (1981).
[23]. Casagrande,L., and S. Poulos, “On the Effectiveness of Sand Drains,” Canadian Geot. J., p.287 (1969).
[24]. Carrillo, N., “Simple two and three dimensional cases in the theory of consolidation of soils,” Journal of Mathematics and Physics, Vol.21, No.1, pp.67-73 (1942).
[25]. Garga, K. V.,“Effect of sample size on consolidation of a fissured clay,” Can. Geotech. J., Vol. 25, No. 1, pp. 77-84 (1988).
[26]. Hansbo, S. “Consolidation of clay by bandshaped prefabricated drains,” Ground Eng’g. 12, pp. 16-25 (1979).
[27]. Hansbo, S., M. Jamiolkowski, & L. Kok, “Consolidation by vertical drains,” Ge'otechniqu, Vol.31, No.1, pp.45-65 (1981).
[28]. Kodandaramaswamy, K., and Narasimha Rao, S.,“The prediction of settlements and heave in clays,” Can. Geotech. J., Vol. 17, No. 4, pp. 623-631 (1980).
[29]. Holtz, R.D.“Preloading with prefabricated vertical strip drain,” Geotextiles & Geomembranes J. 6:109-131 (1987).
[31]. Johnson, S.,“Precompression for improving foundation soils,”Journal of the Soil Mechanics and Foundations Division, ASCE, Vol. 96, No. 1, pp. 111-144 (1970).
[32]. Johnson, S.,“Foundation precompression with vertical sand drains,”Journal of the Soil Mechanics and Foundations Division, ASCE, Vol. 96, No. 1, pp. 145-175 (1970).
[33]. Kjellman, W., “Accelerating Consolidation of Fine-Grained Soils by Means on Card-board Wicks,” Proc. 2nd ICSMFE, Rotterdam. Vol.2, pp.302-305 (1948).
[34]. Lefebvre, G., and Langlois, P., and Lupien, C.,“Laboraty testing and in situ behaviour of peat as embankment foundation,”Can. Geotech. J., Vol. 21, No. 2, pp. 322-337 (1984).
[35]. Marche, R., and Menoret, A., and Mayu, P.,“Preloading at the south end of confignon tunnel,”Journal of Geotechnical and Geoenvironmental Engineering, ASCE, Vol. 123, No. 4, pp. 355-368 (1997).
[36]. Mesri, G.,“Coefficient of secondary compression,” Journal of the Soil Mechanics and Foundations Division, ASCE, Vol. 99, No. 1, pp. 123-137 (1973).
[37]. Mesri, G., and Choi, Y. K.,“The rate of swelling of overconsolidated clays subjected to unloading,”Ge'otechnique, Vol. 28, No. 3, pp. 281-307 (1978).
[38]. Mesri, G., and Stark, T. D., and Ajlouni, M. A., and Chen, C. S.,“Secondary compression of peat with or without surcharging,” Journal of Geotechnical and Geoenvironmental Engineering, ASCE, Vol. 123, No. 5, pp. 411-421 (1997).
[39]. Mitchell, J. K., “Fundamentalsof Soil Behavior,” John Wiley & Sons(1976)
[40]. Richart, F. E. JR., “Review of the Theories for Sand Drains,” Trans., ASCE, Vol.124, pp.709-736 (1957).
[41]. Runesson, K., S. Hansbo, and Wiberg, N., and Wiberg, E., “The Efficiency of partically penetrating vertical drains,” Geotechnique, Vol.35, No.4, pp511-516(1985).
[42]. Samson, L.,“Postconstruction settlement of an expressway built on peat by precompression,”Can. Geotech. J., Vol. 22, No. 2, pp. 308-312 (1985).
[43]. Singh, G., and Hattab, T. N.,“A laboratory study of efficiency of sand drains in relation to methods of installation and spacing,” Ge'otechnique, Vol. 29, No. 4, pp. 395-422 (1979).
[44]. Sridharan, A., and Prakash, K.,“Secondary compression factor,”Proc. Institution of Civil Engineers Geotechnical Engineereering, Vol. 131, pp. 96-131 (1998).
[45]. Sridharan, A. and Rao, S. A.,“Mechanisms controlling the secondary compression of clays,”Ge'otechnique, Vol. 32, No. 3, pp. 249-260 (1982).
[46]. Stamatopoulous, A. C., and Kotzias, P. C.,“Settlement-time predictions in preloading,”Journal of Geotechnical Engineering, ASCE, Vol. 109, No. 6, pp. 807-820 (1983).
[47]. Tan, S. A., and Chew, S. H.,“Comparison of the hyperbolic and asaoka observational method of monitoring consolidation with vertical drains,”Soils and Foundations,Vol. 36, No. 3, pp. 31-42 (1996).
[48]. Tan, S. A.,“Ultimate settlement by hyperbolic plot for clay with vertical drains,” Journal of Geotechnical Engineering, ASCE, Vol. 119, No. 5, pp. 950-956 (1993).
[49]. Terzaghi, K. , The influence of elasticity and permeability on the swelling of two-phase systems. Colloid Chemistry, ed. J. Alexander, 3, Chemical Catalog Co., New York, pp. 65-88 (1931).
[50]. Tomlinson, M. J., and Wilson, D. M.,“Preloading of foundations by surcharge on filled ground,”Ge'otechnique, Vol. 23, No. 1, pp. 117-120 (1973).
[51]. Ue, S., and Fujiwara, H.,“Effect of preloading on post-construction consolidation settlement of soft clay subjected to repeated loading,”Soils and Foundations,Vol. 30, No. 1, pp. 76-86 (1990).
[52]. Win, B. M., Choa, V., Arulrajah, A., and Na, Y. M.,“One-dimension compression of slurry with radial drainage,”Soils and Foundations, Vol. 39, No. 4, pp. 9-17 (1999).
[53]. Yeung, A. T.,“Design Curves for prefabricated vertical drains,” Journal of Geotechnical and Geoenvironmental Engineering, ASCE, Vol. 123, No. 8, pp. 755-759 (1997).
[54]. Yoshikuni, H. and H. Nakanodo, “Consolidation of Soil by Vertical Drain wells with finite Permeability,” Jap. Soc, Soils and Foundation, Vol.14, No. 2, pp.35-46(1974).
QRCODE
 
 
 
 
 
                                                                                                                                                                                                                                                                                                                                                                                                               
第一頁 上一頁 下一頁 最後一頁 top