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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 胡植慶 | |
dc.contributor.author | Chiao-Yin Lu | en |
dc.contributor.author | 呂喬茵 | zh_TW |
dc.date.accessioned | 2021-06-16T17:37:13Z | - |
dc.date.available | 2014-08-20 | |
dc.date.copyright | 2012-08-20 | |
dc.date.issued | 2012 | |
dc.date.submitted | 2012-08-14 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/64256 | - |
dc.description.abstract | 台灣位於歐亞大陸板塊與菲律賓海板塊交界處,為全世界最活耀的造山帶之一,因此,抬升及侵蝕速率驚人,且地震頻繁,再加上每年平均4個颱風侵襲,山區極易發生大規模的山崩事件。本研究將不同於以往,過去研究著重於重建與分析已發生之山崩事件的過程與運動模式,我們將應用以離散元素法(Discrete Element Method,簡稱DEM)為基礎所開發的三維顆粒流軟體PFC3D於山崩災害潛勢區域。廬山岩體滑動區為國內具有重大山崩災害潛勢之地區之一,位於南投縣仁愛鄉精英村廬山溫泉區北坡,為一具有高傾角的深層岩體潛移區,近十年來,每逢豪雨便可紀錄到滑動現象,並伴隨著道路破壞、房屋變形等損壞跡象,因此,在此研究中,我們將以廬山岩體滑動區為例,運用廬山溫泉區北坡歷年來傾度管與時域反射儀的監測資料,推估出可能滑動面的範圍及深度,境況模擬若發生山崩的過程與運動型態,並探討在不同邊界條件下,顆粒之堆積範圍及可能危害之保全對象。模擬結果中顯示,整個廬山溫泉區將在20秒內被土石覆蓋,僅有東邊有少數房屋倖存,但仍須考慮堰塞湖可能造成之威脅。堰塞湖的形成將可能會淹沒政府對於廬山溫泉區所定義的緊急避難處所-廬山警光山莊。顆粒的最大滑移速度依據不同大小範圍的山崩模擬,分別可高達每秒35 公尺與55 公尺,並對約40公頃與50公頃的區域造成影響。從監測滑移面未延伸至下半部坡體的模擬變形資料中,可對應到實際傾度管所監測到的變形曲線,因此,若滑移面繼續向坡趾處延伸,在極端氣候等因素影響下,不能排出發生巨變型山崩的可能性。本研究藉由三維數值模擬的方式,了解未來若發生山崩,其運動型態、速度與堆積形貌,並可以考量到山崩的側向影響範圍,將能做為未來山崩衝擊區域的災害評估,提供政府單位對山崩潛勢性高之區域土地規劃的重要參考。 | zh_TW |
dc.description.abstract | Landslide is a pestilent natural disaster in many countries around the world. Due to the subtropical climate with annual average four typhoons, combined with frequent earthquakes facilitate to the gravitational sliding in Taiwan. The potential Lushan landslide area is located at a famous hot spring district of Nantou County in central Taiwan which slides frequently due to heavy rainfall. Lushan landslide area demonstrates a possible deep-seated (up to 108 meters) creep along a dip-slope direction with high dip angle. In this study, we simulate the possible scenarios of catastrophic landslide, kinematic process and the assessment of impact area by 3D Particle Flow Code (PFC3D), which is conducted by the three dimension granular discrete element method. The sliding surface is extrapolated by the results of inclinometer and Time Domain Reflectometer (TDR) monitoring systems. Considering the complex geological background of possible different sliding surfaces to estimate the impact area after landslide for pre-landslide scenario simulations, we performed numerical experiments with different boundary conditions and parameters. From our numerical experiments, the Lushan hot spring district is predicted to be covered in 20 seconds except some buildings on the eastern side, where still be menaced by avalanche lakes including the secure refuge of Lushan hot spring district. The predicted maximum velocity is about 35 - 55 m/s and destroy an area about 40 - 50 hectares. The deformation tendency of models without lower sliding surface is similar to the records of inclinometers. From the simulations, when sliding surface extending to the lower slope, that may cause catastrophic disaster in the future. The numerical results of this study will suggest important assessment of movement and deposition for potential landslide cases and landslide susceptibility mapping. | en |
dc.description.provenance | Made available in DSpace on 2021-06-16T17:37:13Z (GMT). No. of bitstreams: 1 ntu-101-R99224202-1.pdf: 23448573 bytes, checksum: 2a0dce8dc2fcda3ea91a3b8e781d6c62 (MD5) Previous issue date: 2012 | en |
dc.description.tableofcontents | VERIFIVATION LETTER FROM THE ORAL EXAMINATION COMMITTEE.....I
LIST OF FIGURES V LIST OF TABLES IX 致謝 (ACKNOWLEDGEMENTS) XI ABSTRACT XIII 摘要 XV 1. INTRODUCTION 1 1.1. STRUCTURE OF RESEARCH 3 1.2. MOTIVATION AND PURPOSE 4 1.3. NUMERICAL SIMULATION 6 1.3.1. Numerical methods in rock mechanics 7 1.3.2. Numerical models for landslides 8 2. GEOLOGICAL FRAMEWORK 11 2.1. GEOLOGICAL SETTING OF LUSHAN AREA 11 2.2. HISTORICAL FAILURE AT LUSHAN AREA 15 2.3. MECHANISMS OF LUSHAN LANDSLIDE 18 3. THREE DIMENSION DISTINCT ELEMENT MODELING 21 3.1. GENERAL FORMULATION 21 3.1.1. Distinct-Element Method (DEM) 23 3.1.2. Calculation cycle 24 3.2. ABOUT PFC MODEL 26 3.2.1. Macroproperties and microproperties 26 3.2.2. Virtual rock experiment 29 4. NUMERICAL EXPERIMENTS FOR THE LUSHAN LANDSLIDE 33 4.1. CONSTRUCTION OF PFC NUMERICAL MODEL 33 4.1.1. Definition of slip surface 33 4.1.2. Stratification and parameters of ball-elements 36 4.1.3. Monitoring of landslide process 40 4.2. LANDSLIDE OF MINOR SLIDING AREA 41 4.2.1. Simulation of landslide process 41 4.2.2. Variation of velocity field 48 4.2.3. Run-out path and displacement 54 4.3. LANDSLIDE OF POTENTIAL SLIDING AREA 59 4.3.1. Simulation of landslide process 59 4.3.2. Variation of velocity field 66 4.3.3. Run-out path and displacement 72 5. DISCUSSIONS 77 5.1. DIFFERENT BOUNDARY CONDITIONS 77 5.1.1. Variation of rock composition 77 5.1.2. Constraints on friction coefficients 80 5.2. CONDITIONS WITHOUT LOWER SLIDING SURFACE 83 5.3. THE AVALANCHE LAKES 89 5.4. LIMITATIONS OF PFC MODELS 92 6. CONCLUSIONS 95 REFERENCE 99 APPENDIX A. OPERATION OF PFC3D 107 A.1. FORCE-DISPLACEMENT LAW 107 A.2. LAW OF MOTION 110 A.3. CONTACT MODE 111 APPENDIX B. THE SLIDING RECORDS DURING 2005 – 2009 115 APPENDIX C. RUN-OUT AND DEPOSIT AREA IN DIFFERENT CONDITIONS 123 | |
dc.language.iso | en | |
dc.title | 應用三維離散元素法分析潛在性山崩-以廬山溫泉北坡為例 | zh_TW |
dc.title | Assessment of movement and deposition for a potential landslide in Lushan area, central Taiwan by 3D discrete element simulation | en |
dc.type | Thesis | |
dc.date.schoolyear | 100-2 | |
dc.description.degree | 碩士 | |
dc.contributor.coadvisor | 詹瑜璋 | |
dc.contributor.oralexamcommittee | 林銘郎,董家鈞,張光宗 | |
dc.subject.keyword | 山崩,廬山溫泉區,近況模擬,三維離散元素法,敏感區域, | zh_TW |
dc.subject.keyword | Landslide,Lushan,Scenario simulation,PFC3D,Susceptibility map, | en |
dc.relation.page | 124 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2012-08-15 | |
dc.contributor.author-college | 理學院 | zh_TW |
dc.contributor.author-dept | 地質科學研究所 | zh_TW |
顯示於系所單位: | 地質科學系 |
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