研究生: |
洪世雄 S-S HUNG |
---|---|
論文名稱: |
垂直排水帶打設過程對地表沉陷之影響研究 Influence of Installation Process of Prefabricated Vertical Drains on Surface Settlement |
指導教授: |
廖洪鈞
Hung-Jiun Liao |
口試委員: |
林宏達
H-D Lin 蘇世豐 S-V Sui |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 營建工程系 Department of Civil and Construction Engineering |
論文出版年: | 2005 |
畢業學年度: | 93 |
語文別: | 中文 |
論文頁數: | 111 |
中文關鍵詞: | 垂直排水帶 、地表沉陷 |
外文關鍵詞: | Surface Settlem, Prefabricated Vertical Drains |
相關次數: | 點閱:157 下載:9 |
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為了解垂直排水帶打設時,垂直導桿插入土中所遺留之孔隙收縮,對地表沉陷之影響,本文蒐集台北捷運淡水線四處車站進行排水帶時之地表沉陷和土壤孔隙水壓變化資料。其中,案例C和D之沉陷體積和孔隙體積上下限值之比值介於1:1到1:3之間,沉陷體積和孔隙體積之比值呈現性關係發展。至於案例A之沉陷體積和孔隙體積上下限值之比值介於1:2到1:5之間,而案例B之沉陷體積和孔隙體積之比值更是在1:4以下。顯示雖然沉陷體積和孔隙體積存在著相當的關係,但這個關係尚無法由現有的數據加以明確的量化。造成案例A與案例C和D間數據之差異,可能是排水帶長度較長時(如案例A= 28m),較深處之孔隙體積(即超過案例C和D之排水帶長度=18m部分),反應在地表沉陷時,其比例要小於深度較淺的孔隙(小於18m)。
To investigate the influence of installation process of prefabricated vertical drains (PVD) on the subsequent surface settlement, the field monitoring data (e.g., ground surface settlement and pore water pressure change) of the PVD construction carried out at 4 Taipei MRT stations of Danshui Line were collected and analyzed. The analysis was focused on the influence of closing void, which is left behind by the mandrel used to install PVD, on the ground surface settlement. Among the 4 cases, the ratios between settlement volume and void volume of Cases C and D range from 1:1 to 1:3. A linear relationship between settlement volume and void volume was observed. In comparison, the ratios range from 1:2 to 1:5 for Case A and less than 1:4 for Case B. Although it seems that there exists certain relationship between settlement volume and void volume, it is still unable to establish a quantified relationship based the available field data. One of the possible reasons for the difference in the ratio between settlement volume and void volume is the difference in PVD length. The PVD length of Case A was 28m compared to 18 m for Cases C and D. Since the deeper the void, the less influence the void can result on the surface settlement. Therefore, the ratio between settlement volume and void volume of Case A is smaller than that of Cases C and D.
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