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研究生:劉重憲
研究生(外文):Liu, Zhong-Xian
論文名稱:節理岩體變形行為規模效應之研究
論文名稱(外文):Study on the scale effect of deformability of jointed rock masses
指導教授:楊長義楊長義引用關係
指導教授(外文):Yang, Zhang-Yi
學位類別:碩士
校院名稱:淡江大學
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
論文出版年:1994
畢業學年度:82
語文別:中文
論文頁數:115
中文關鍵詞:節理岩體變形行為規模效應土木工程工程節理岩體數學模式規模效應代表性基本體積
外文關鍵詞:"CIVIL-ENGINEERINGENGINEERINGjointed rock massmathematical modelscale effectrepresentative elementary volume"CIVIL-ENGINEERING
相關次數:
  • 被引用被引用:1
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岩體變形行為主要受節理型態或節理力學性質之影響,而體積不同之岩體
所可能包括的節理數量亦不等,以致岩體變形模數一般均隨試驗試體體積
之增加而變小,此一現象稱為規模效應(scale effect)。在變形模數值不
再隨所考慮岩體體積增大而變時,稱此岩體為代表性REV)岩體。本文提出
一套建議的方法,可透過簡單的實驗室試驗獲得節理之最大閉合量,及完
整岩石單壓強度二分之一處的彈性變形量,用來預測實驗室含節理之單壓
試體及現地節理岩體試驗的變形性規模效應消失點,並建議現地試驗規模
的最小平鈑尺寸;加上利用一套岩體非線性變形數學模式,透過對節理變
形性因素的探討,獲致下列結論:岩體變形模數值隨節理頻率之增加而遞
減,其規模效應除與節理頻率和勁度有密切關係外,亦具有異向性特性;
由建議方法及數學模式預測與試驗結果比較得知:選用割線模數之規模效
應較切線模數顯著,實驗室試體的變形模數約在試體含5∼6條節理後,便
可得到一個穩定的變形模數值,預測與試驗結果相當一致,顯示本文數學
模式之預測岩體變形性規模效應可行性頗高;由現地試驗資料分析後,顯
示:透過洪如江等(1983)建議的方法,將現地試驗體積換算成影響深度內
所含的節理數目,約為實驗室試體所含節理數目的2∼6倍,與現地資料分
析結果相符,顯示本文建議的方法具相當的可行性。

The deformability of jointed rock masses is mainly depended on
the configurations and the mechanical behavior of joints within
the rock masses. The larger test volume having more joints
demonstrates lower deformation modulus. It is called the scale
effect in the deformability of rock masses.There exists a
certain volume,representative elementary volume(REV) of the
rock masses, beyond which the scale effect is negligible. A
suggested method based on simple laboratory test to determine
the maximum closure of a joint and the elastic deformation of
the intact rock at half the uniaxial compression strength in
this study, will be used to predict the diminishing point of
scale effect on deformability of in-situ jointed rock masses
test and jointed samples of the laboratory test, and to propose
the smallest size of plate-loading test. Also,an existing
mathematical model on the deformability of rock masses
varified by the physical model tests will be used in this
study. The Scale effect on deformation of the rock masses with
various joint configurations will be determined based on the
parameter studies. Conclusions drawn from this research program
are: (1)The deformation modulus of rock masses decreases as the
joint frequency increases. Not only does scale effect depend on
the joint frequency and the joint stiffness, but it also has
anisotropic property; (2)From comparison of prediction by this
suggested method and mathematical mdel test result can obtain
that : the secant moduli revealed more marked scale effect than
the tangential moduli. A steady deformation mudulus is reached
when the number of joint reaches 5~6. Prediction by this
suggested method can give a good agreement with test reasult.
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