傾斜互層地層之承載力分析

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Title:	傾斜互層地層之承載力分析
Authors:	蘇正中;zhen-Cho Shu
Contributors:	土木工程研究所
Keywords:	互層地層;承載力;基礎位置;互層傾角;互層厚度;週寬比;FLAC;interlayered formation;bearing capacity;position of footing;interlayered inclined angle;thickness of interlayer;cycle-widthratio;FLAC
Date:	2002-01-18
Issue Date:	2009-09-18 17:06:52 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	互層地層為兩種大地材料交互堆疊而成的層狀地質構造，常見於台灣、西部麓山帶。影響互層地層承載力的因素甚多，為了釐清互層地層的承載行為，本文擬以「傾斜互層地層之承載力分析」為題進行研究。以傾斜互層地層作為前提，針對互層地層的三個主要參數進行研究： 1.基礎位置、2.互層傾角、3.互層厚度，研究這三個參數對互層地層承載力的影響。透過FLAC 程式的協助進行數值模擬分析，並將分析結果進行討論。研究結果顯示，對於基礎位置而言，當週寬比（週期互層厚度與基礎寬度之比值）約小於1 時，在同一互層傾角條件下，基礎不論置於互層地層地表上之何處，其承載力都會非常接近、相差不大。這是因為此時的基礎寬度約足以涵蓋住一整個互層厚度，使兩種互層材料個別的強度特性被綜合所致；而當週寬比約大於1 時，在同一互層傾角條件下，此時隨著基礎位置的改變，其承載力已開始會出現週期性的起伏變化。這是因為此時基礎寬度已無法涵蓋住一整個互層厚度，因此基礎放置的位置與承載力之大小關係相當密切。對於互層傾角而言，當週寬比約小於1 時，隨著互層傾角的增加，各基礎位置的承載力亦會跟著增加；當週寬比約大於1 時，隨著互層傾角的增加，各基礎位置的承載力變化將變得更複雜。整體而言，隨著互層厚度增大，基礎位置的週期承載特性會越明顯，互層傾角的承載行為會越複雜。 Interlayered formation is a kind of layered formations formed by two geological materials storing up mutually. Three major parameters will affect the bearing capacity of interlayered formation, including positions of footing, interlayered inclined angle, and thickness of each interlayer. In this thesis, the bearing capacity of inclined interlayered formation will be analyzed by using FLAC program to find how the three parameters could affect it. The FLAC analysis results as follows. With regard to positions of footing, if the cycle-width ratio is smaller than 1, as long as in the same interlayered inclined angle, the position of footing won’t affect the bearing capacity. If the cycle-width ratio is larger than 1, the bearing capacity will change periodically along with the movement of footing. With regard to interlayered inclined angle, if the cycle-width ratio is smaller than 1, the bearing capacity of any footing position will increase while interlayered inclined angle increases. If the cycle-width ratio is larger than 1, the bearing capacity behavior of any footing position will be more complex. In conclusion, if thickness of each interlayer is increasing, the cycling bearing capacity characteristic of different positions of footing will become much more obvious, and the bearing capacity behavior of different interlayered inclined angle will become complex
Appears in Collections:	[Graduate Institute of Civil Engineering] Electronic Thesis & Dissertation

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