Theoretical Development and Application of Meshfree Method in Geotechnical Problems Involving Large Deformations

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Project title

Code/計畫編號

NSC101-2221-E002-173

Translated Name/計畫中文名

無網格法在大地工程中大變行問題之理論發展與應用

Funding Organization/主管機關

National Science and Technology Center for Disaster Reduction

Co-Investigator(s)/共同執行人

郭安妮(計畫主持人)

Department/Unit

Department of Civil Engineering,NTU

Website

https://www.grb.gov.tw/search/planDetail?id=2631303

Year

2012

Start date/計畫起

01-08-2012

Expected Completion/計畫迄

31-07-2013

Co-Investigator(s)

Pai-Chen Guan

Bugetid/研究經費

627千元

ResearchField/研究領域

土木水利工程

無網格法在大地工程中大變行問題之理論發展與應用台灣由於地質年輕，地震頻繁，大部分山坡地土質較為鬆動且不穩定。加上處於亞熱帶地區，終年雨量豐沛。這些不利的天氣與地質條件的總和造成台灣成為自然災害 (例如土壤液化造成地表土體流動、側滑與土石流)發生地高危險地區。這些自然災害由於包括多相流與大變形的特性，傳統數值方法只能利用過度簡化的方式。發展出一個完整描述這些自然災害的數值方法仍然是一個非常具有挑戰性的研究領域。本研究的目的在於建立一套完整分析的大地工程問題之數值分析方法，針對液化與土石流問題進行分析。並利用已經有完整發展之RKPM法研發固流偶合之材料模型，主要利用meshfree裡的RKPM發展以下三個部分:(1)以RKPM為核心的數值模擬程式，主要處理土體之非線性大變形。顆粒與細緻材料之間的行為將以連續體與非線性材料模型模擬；⑵發展RKPM Lagrangian formulation用於流動土石中含水量變化之分析，用於土體模擬之RKPM點可以直接用於建構流體的離散與近似。(3)時間與空間離散方法的穩定度分析；(4)案例分析：將所發展的數值方法應用於土壤液化造成的土體流動、側移，與土石流行為。 Application of Meshfree Method in Geotechnical Engineering Problems with Large Deformation Taiwan is tectonically active with relatively young geologic deposit. Majority of the slopes are composed of unstable loose soil materials. In addition, Taiwan is located in a sub-tropical region and there is abundant rainfall throughout the year. With the aforementioned climatic and geologic environments, Taiwan is very susceptible to natural hazards such as liquefaction-induced flow slide, lateral spreading and debris flow. The modeling of these phenomena is very challenging because all of them involve multi-phase interaction and large deformation. The objective of this research is to develop a complete numerical scheme to adequately model geotechnical engineering problems involving large deformation - liquefaction and debris flow. RKPM meshfree method would be extended to handle solid-fluid interaction. The major tasks of the research include: (1) Develop RKPM formulation for non-linear large deformation of soil, including the non-linear material model for granular-fine particle interaction, solid-fluid interaction, contact between granular particle; (2) Develop RKPM Lagrangian formulation for water flow through porous media (3) Temporal and spatial stability analyses for the proposed numerical method (4) Case Studies - Application of proposed numerical methods on liquefaction-induced flow slide, lateral spreading and debris flow.

Keyword(s)

Liquefaction
Lateral Spreading
Debris flow
meshfree method
numerical method
geo-mechanics
granular material
土壤液化
側移
無網格法
數值方法
土壤力學
顆粒材料

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Theoretical Development and Application of Meshfree Method in Geotechnical Problems Involving Large Deformations

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