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研究生:林韋廷
研究生(外文):Wei-Ting Lin
論文名稱:以抽氣圓柱模型模擬垃圾掩埋場沉陷行為之研究
論文名稱(外文):Use Gas Vent Cylinder Model To Study Landfill Settlement Behavior
指導教授:劉家男劉家男引用關係陳國賢陳國賢引用關係
指導教授(外文):Chia-Nan LiuKuo-Sheng Chen
學位類別:碩士
校院名稱:國立暨南國際大學
系所名稱:土木工程學系
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:89
中文關鍵詞:垃圾掩埋場沉陷量沉陷預估模式生物分解抽氣井
外文關鍵詞:Refuse landfillSettlementEstimate modeBiodegradationVent
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對環保政策愈來愈受重視及土地資源有限的台灣而言,垃圾掩埋場封閉後,其土地開發與再利用之復育觀念,已漸漸被重視並進一步發展。在此之前,需了解垃圾相關之工程性質,尤其是其壓縮性及其受有機物生物分解之影響,不僅有助於預估垃圾掩埋場之沉陷行為,更可藉此推估掩埋場最大容許堆積量及使用年限。本研究基於掩埋場中氣體遵守氣體質量守衡之觀念,考慮有機物因生物分解而生成氣體,使掩埋場內部氣體含量及氣壓逐漸增加,導致氣體在掩埋場內部流動,並由抽氣井(主動式和被動式)及頂面排出掩埋場,使掩埋場內部體積隨之減少,導致沉陷之發生。
本研究參考Chen等人(2003)所提氣壓消散模式,並考慮主動式抽氣井之效應,而發展出以軸對稱圓柱體積來建立三維垃圾掩埋場沉陷預估模式,以模擬垃圾掩埋場於掩埋完成後因生物分解造成之沉陷量,為驗證本沉陷預估模式之合理性與正確性。逐利用此模式來模擬實際掩埋場之沉陷行為,並與實際垃圾掩埋場長期沉陷觀測資料比較,結果顯示本研究所提沉陷預估模式可合理模擬掩埋場內部氣體壓力分佈及掩埋場地面之沉陷行為。最後,進行模式內重要參數之分析研究,以探討其代表之意義及其對氣壓分佈及沉陷之影響,此有助於模式應用時,能合適地運用相關參數,以提升模式預估之準確性。
The concept of landfill rehabilitation and reutilization have gradually been valued and developed further after landfill closed in Taiwan as a result of the environmental protection policy and the limited land resource. The understanding of the waste related engineering property, particularly its compressibility and the influence of organic biodegradation, is not only contributes to estimate that the landfill settlement behavior, but also can assess its capacity and service lifetime. In view of the landfill gases obey the conservation law of gas mass, this study considers the biodegradation of organic materials and generates the gas, then lead gas pressure gradually accumulating and cause the gas flow in the landfill, and finally discharge out from landfill via the gas vent (active or passive) and surface. Consequently, the inner volume of the landfill decreases gradually and results in settlement.
This study utilizes the gas dissipation mode proposed by Chen (2003) and considers the effect of gas vent, to develop a 3D symmetrical cylinder model to predict the landfill settlement which cause by the biodegradation of organics in the landfill. For verifying the rationality and accuracy of this settlement prediction model, an operating landfill has been simulated to calculate its settlement, and then compare with the field settlement data. It shows that this settlement prediction model can reasonably simulate the distribution of gas pressure and the settlement behavior of the landfill. Furthermore, parameter analysis of important parameters of this model also been carried to discuss its physical meaning and its influence on the simulated results.
致謝 I
摘要 II
Abstract III
目錄 V
表目錄 VII
圖目錄 VIII
符號表 XI
第一章 緒論 1
1.1研究動機與目的 1
1.2研究方法 2
1.3研究流程 2
1.4論文架構 4
第二章 文獻回顧 5
2.1垃圾組成成份及特性 5
2.2沉陷行為與影響因素 6
2.2.1沉陷作用 6
2.2.2掩埋場沉陷機制 7
2.2.3影響垃圾沉陷速率之因素 8
2.3掩埋場之生物分解行為 9
2.3.1生物分解過程 9
2.3.2掩埋場產氣行為 11
2.4氣體消散速率對沉陷之影響 12
2.5垃圾掩埋場沉陷預估模式 13
2.5.1氣壓消散模式 13
第三章 垃圾掩埋場沉陷預估模式 24
3.1 模擬方程式之推導 24
3.2 解方程式 26
3.3 模式驗證 35
第四章 參數研究 47
第五章 結論與建議 82
5.1結論 82
5.1.1掩埋場沉陷預估模式之建立與驗證 82
5.1.2參數分析 83
5.2 建議 84
參考文獻 85
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