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研究生:李劭瑋
研究生(外文):Shao-Wei Li
論文名稱:複合式隔振設施降低波傳能量之研究
論文名稱(外文):Vibration isolation research of composed wave barriers
指導教授:張惠文張惠文引用關係
指導教授(外文):Huei-Wen Chang
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
畢業學年度:93
語文別:中文
論文頁數:119
中文關鍵詞:複合式隔振設施鋼板槽溝模型試驗動力壓密工法
外文關鍵詞:simulated dynamic compaction testtrenchsteel platecomposed wave barriersdynamic consolidation method
相關次數:
  • 被引用被引用:2
  • 點閱點閱:234
  • 評分評分:
  • 下載下載:22
  • 收藏至我的研究室書目清單書目收藏:1
摘 要
採用動力壓密工法進行土質改良施工時,地層將因夯錘夯擊而產生體波與表面波,其中體波能穿透地層,使土壤架構趨於緊密,但表面波對土壤改良並無助益,且可能造成結構物之損害。
為降低表面波對結構物之影響,本研究以鋼板與槽溝作為阻隔振波傳遞之複合式隔振設施,並進行模型試驗。藉由模型試驗探討複合式隔振設施中,鋼板埋入深度、鋼板寬度、鋼板與振源距離及槽溝之挖掘對於不同相對密度砂土隔振效果之影響。
由試驗結果可知,以鋼板之埋入深度為0.3倍振波波長及槽溝之深度為0.2倍、寬度為0.74倍振波波長所組成的複合式隔振設施,對相對密度較小之砂土能阻隔較多波傳能量,即複合式隔振設施對相對密度較小之砂土有較佳隔振效果。由不同鋼板寬度或鋼板埋入深度之試驗可知,鋼板寬度愈寬或鋼板埋入深度愈深,則隔振效果愈佳,若以面積大於試體斷面之鋼板完全截斷試體,其隔振效果可達99%以上。
ABSTRACT
When improving soil layer by using dynamic consolidation method, the body wave and surface wave occur in soil layer because of the impact. The body wave can go through the soil layer and make the structure of soil denser. But the surface wave can not improve the soil strength, and it may damage the structure.
To realize the acceleration amplitude of surface wave can be reduced by composed wave barriers, which were composed of steel plate and open trench, this research carried out a series of simulated dynamic compaction tests with small-scale sandy ground models in laboratory. The relationships between the effect of isolation and test parameters, which included the embedded depth of steel plate, the width of steel plate, the distance between impact source and steel plate, the depth of open trench, and the relative density of sandy ground model were discussed in this research.
From the result of experiments, it was revealed that the composed wave barriers whose embedded depth of steel plate was 0.3 times of wavelength, depth of open trench was 0.2 times of wavelength and width of open trench was 0.74 times of wavelength could reduce more energy of wave when the relative density of soil is small, that is to say, the effect of isolation by using the composed wave barriers can be found for small relative density. The result of experiments also revealed that the effect of isolation can be obtained while the embedded depth of steel plate or the width of steel plate increased. The amplitude reduction factor could be less than one percent while the steel plate totally cut off the specimen.
目錄
中文摘要Ⅰ
英文摘要Ⅱ
目錄Ⅲ
表目錄Ⅵ
照片目錄Ⅶ
圖目錄Ⅷ
符號說明ⅩⅢ
第一章 緒論1
1-1 前言1
1-2 研究動機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 動力壓密工法之改良理論4
2-2 振波性質與衰減模式5
2-2-1 振波性質5
2-2-2 振波衰減模式7
2-3 隔振設施相關研究8
2-3-1 現地及室內實驗8
2-3-2 數值分析10
第三章 試驗土樣與試驗方法23
3-1 試驗砂之基本物理性質23
3-1-1 最大乾單位重試驗23
3-1-2 最小乾單位重試驗24
3-2 試體相對密度之標定24
3-2-1 試驗設備24
3-2-2 試驗步驟25
3-3 鋼板埋入深度對振波阻隔之影響試驗25
3-3-1 試驗設備25
3-3-2 試體製作27
3-3-3 試驗步驟27
3-4 鋼板樁與振源間距對振波阻隔之影響試驗28
3-4-1 試體製作28
3-4-2 試驗步驟29
3-5 鋼板寬度對振波阻隔之影響試驗29
3-5-1 試體製作29
3-5-2 試驗步驟30
3-6 複合式隔振設施對振波阻隔之影響試驗30
3-6-1 試體製作30
3-6-2 試驗步驟31
3-7 試驗規劃31
第四章 試驗結果與分析47
4-1 砂土試體中振波之性質48
4-2 不同鋼板埋入深度對振波阻隔之影響50
4-3 不同鋼板與振源距離對振波阻隔之影響56
4-4 不同鋼板寬度對振波阻隔之影響59
4-5 槽溝對振波阻隔之影響61
4-6 試體相對密度對振波阻隔之影響63
第五章 結論與建議100
5-1 結論100
5-2 建議101
參考文獻102
參考文獻
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