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題名 | 於液化地層潛盾鑽掘工程之施工管理與防治--以蘆洲線CL804標為例=Management and Prevention of Liquefied Stratum in Shield-Tunnel Excavation--Taking the Luzhou Line Contract CL804 as an Example |
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作者 | 劉安德; | 書刊名 | 捷運技術 |
卷期 | 41 2009.08[民98.08] |
頁次 | 頁79-84 |
分類號 | 441.9 |
關鍵詞 | 液化潛能; 最大地震力; 土壤孔隙率; 捷運蘆洲線; Potential of liquefaction; Powerful seismic forces; Soil porosity; Luzhou line; |
語文 | 中文(Chinese) |
中文摘要 | 捷運蘆洲線尾端部分潛盾段及蘆洲機廠,因近淡水河,地質鬆軟,經地質鑽探結果顯示 部分區域地表下約6公尺至20公尺有較厚之粉土質砂層,於最大地震力作用下,液化潛能頗 高,因而需於各不同結構體,設計、施作各項防治液化工程。另部分區域早年係回填垃圾之 土層,其位置(GL-7∼-8公尺)深淺不一且非均勻分佈,且本區域土壤孔隙率高,易因受擠壓 致地層体積劇烈變化。因此,潛盾鑽掘時,易因地盤反力不足,使得後方環片橫向移動,產 生於曲線段無法依設計線形轉彎之現象,另因覆土較淺,除橫向反力外,下側反力亦不足, 導致潛盾機除無法轉彎外,亦產生下陷現象。因此不論於施工管理或液化防治上均需慎密考 量並採行多項措施始能順利完成本項工程並杜絕爾後液化潛能之危害。 |
英文摘要 | The end section of the shield-tunnel of the Luzhou line and Luzhou Depot is near the Danshui River. Geological drilling results showed there is a deep layer of powder sand 6-20 meters below the ground surface layer, causing a high potential of liquefaction under the action of powerful seismic forces. As a result, it was necessary to design and construct various anti-liquefaction measures for different structures. In addition, a part of the area contained refuse backfill soil with a non-uniform distribution located 7-8 meters underground. On top of that, due to the high rate of soil porosity in the region, the nature of the stratum is subject to suffering violent change caused by pression. Therefore, during shield tunnel excavation, a lack of ground reaction force caused rear segments of the shield tunneling machine to move transversely, generating a phenomenon that the tunneling machine cannot make a turn in accordance with its design. In addition, another result of the shallow layer of surface soil, in addition to horizontal reaction force, underside reactions were also inadequate, making turning of the shield tunneling machine impossible. It also produced the phenomenon of subsidence. Therefore, careful consideration regarding construction management and liquefaction prevention as well as taking related measures are necessary to eliminate any potential harm caused by liquefaction. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。