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研究生:蘇建彰
研究生(外文):Su Jiann-Jang
論文名稱:含共線裂縫岩石破裂機制之研究
論文名稱(外文):Study on the Fracture Mechanism of Colinear-Crack Rocks
指導教授:楊長義楊長義引用關係
指導教授(外文):Yang Zon-Yee
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:1995
畢業學年度:83
語文別:中文
論文頁數:163
中文關鍵詞:裂縫應力集中破裂機制破壞模式規模效應岩橋材料特性曲線滑動
外文關鍵詞:crackstress concentrationfracture mechanismfailure modes
相關次數:
  • 被引用被引用:5
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自然界中之岩體即使其強度極高或非常緻密,均會有細微裂縫存在於其中
,而當外在應力作用下,岩體即會因裂縫周圍應力集中而造成破壞。因此
欲瞭解岩體之強度時,對於岩體中裂縫之破裂機制,有其探討之必要。本
研究即分成物理模型試驗及理論分析兩方面,就岩體中含非連續裂縫之破
裂機制進行研究。首先本文以石膏為岩石模擬材料,製作尺寸為30cm×30
cm×5cm 且含各型裂縫之試體,進行一系列之單軸壓縮試驗,透過各種不
同配置之預製裂縫安排,可觀察裂縫發生破裂之變化關係,其次再對於裂
縫周圍進行應力分佈之理論分析,進而可探討裂縫發生破裂之機制。研究
結果顯示:(1) 裂縫之初始破裂型態多以張裂型式出現;(2) 裂縫之尺寸
對初始張裂強度有影響,即存在規模效應問題;(3) 當裂縫分佈在一同線
上時,裂縫破裂機制隨岩橋長度之不同,可分成 TSL、TLS及LTS三種不同
破壞模式;(4) 從本文訂定之材料性質特性曲線配合Griffith強度理論中
之橢圓裂縫邊緣之切線應力公式,可以估算裂縫臨界初始張力破裂之發生
強度;(5) 若引伸至模擬節理面之張裂機制分析,透過材料特性曲線求取
等效裂縫形狀,及應用橢圓裂縫邊緣之切線應力公式,可求得節理面發生
初始張裂之強度曲線;(6) 此一初始張裂強度曲線若與Jae- ger 滑動強
度曲線相配合,則可得知節理面發生初始張裂、滑動或兩者混合發生等破
裂模式判斷準則。

Rocks, in nature, all have subtle cracks even though they have
high strength. Under an ousideload, rocks will have fail- ure
due to the concentration of stresses around cracks. There-
fore, thefracture mechanism of cracks in rocks is an essential
issue to realize the strength of rocks. This research is di-
vided into two aspects:physical model experiment and theore-
tical analysis to explore the fractures mechanism of colinear-
crack rocks. In this research,plaster was selected as the
material pre- senting rocks. Samples were made in the size of
30cmx30cmx5cm and contained various cracks, then a serious of
uniaxial load tests were processed. Through arranging the
compound types of pre-made cracks, the conditions of fracture
of cracks can be observed. In addition, the theoretical
analysis of stresses distribution of under loading cracks could
verify the fracture mechanism of the cracks. Following are the
research-results. (1) The initial fracture of cracks, almost,
appeared in form of size of cracks affected the initial tension-
crack strength that was the problem of existent scale effects.
(3) When the cracks were distributed in a line, the fracture
mechanism of cracks with the differences of rock bridge length
was classified in three failure modes: TSL, TLS, and LTS. (4)
Through the material-characteristic curve which is defined in
this paper and the formula of Grif- fith's stress distribution
theory, the strength of initial tension fracture could be
obtained. (5) Applying this result to the analysis of tensile
fracture mechanism of joints plane, the equal-effect shape of
ellipse cracks could be obtained through the material-
characteristic curve, and the initial tension strength of joint
could be obtained through the formula of stress distribution
theory. (6) By coordinating the initial tension strength curve
with Jaeger's sliding strength curve, the judgemental rule for
fracture modes,such as the initial tension fracture,sliding and
mixing type,could be realized.

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