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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/89983
標題: | 利用非連續體分析斷層附近應力變化與地表位移關係 The Relationship Between Stress Change Near The Fault and Surface Displacement by Using Discrete Element Analysis Software |
作者: | 林連冠 Lien-Kuan Lin |
指導教授: | 鄭富書 Fu-Shu Jeng |
共同指導教授: | 王泰典 Tai-Tien Wang |
關鍵字: | 現地應力,斷層,應力變化,地表位移,離散元素法, In-situ stress,Fault,Stress change,Surface displacement,Discrete element method, |
出版年 : | 2023 |
學位: | 碩士 |
摘要: | 現地應力為評估斷層活動與災害潛勢的重要因素,也是隧道工程開挖、地球資源開採、廢棄物處置與封存場址工程設計的重要參數。臺灣位於板塊構造帶邊緣,受菲律賓海板塊與歐亞板塊每年平均8.2cm聚合速率影響,從集集地震事件後至今已有超過400個GPS連續觀測站用於大地測量並監測大地變形,經由GPS連續觀測站於同震運動期間量測的位移資料可以用以分析斷層錯動量。經過大的地震事件後可能改變區域應力場的主應力方向,近年來發展出結合震源機制解及地震引致的應力變化量對區域地殼應力的調查方法。於此逆推現地應力張量的作法中,使用權衡函數做為模型平滑參數,量化現地應力的不確定,因此斷層錯動後地層應力變化與地表位移的關係為關鍵的輸入參數。本研究目的即是透過非連續體數值模擬方式探討斷層錯動後地層應力變化量與地表位移的關係,以建立矩陣方式評估發展解算方法之可能性。 In-situ stress is an important factor in evaluating fault activity and disaster potential, and is also an important parameter in engineering design of underground and tunnel engineering excavation, earth resource extraction, waste disposal and storage sites. Taiwan is located on the edge of a plate tectonic belt and is subject to frequent seismic activity. After the chi-chi earthquake, over 450 continuous observation stations have been utilized for geodetic measurements and monitoring surface displacement. Displacement data obtained from GPS continuous stations during the co-seismic period can be used to analyze fault slip. Major seismic events can alter the regional stress field, and in recent years, a methodology has been developed to investigate regional crustal stress by combining solutions from focal mechanisms and stress changes induced by earthquakes. In this inverse of the current in-situ stress tensor method, the trade-off curve function is used as the smoothing parameter of the model to quantify the uncertainty of the in-situ stress. Therefore, the relationship between the stress change and the surface displacement after fault dislocation is the key input parameter. The purpose of this study is to establish the relationship between the stress change and the displacement of the surface through the numerical simulation, and evaluate the possibility of developing a solution method. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/89983 |
DOI: | 10.6342/NTU202303121 |
全文授權: | 同意授權(限校園內公開) |
顯示於系所單位: | 土木工程學系 |
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