岩石開裂之基本受力行為以張力破壞及剪力破壞居多，本研究分別進行直接剪力試驗及單軸壓縮試驗，並結合非破壞檢測技術，由巨微觀深入研探岩材之破裂機制。於斜剪試驗以水泥砂漿模擬類岩材料，單壓試驗以混凝土、水泥砂漿及水泥漿模擬類岩材料，研析岩石受壓、剪應力作用下之內部顆粒幾何形狀與微觀破壞機制，探尋岩石材料於壓、剪力作用時之破壞行為與歷程關係。
以類岩材料內部顆粒幾何大小對破壞過程中聲射訊號之影響為研究主軸，藉由改變類岩材料「顆粒材之粒徑大小」為主要變數，此外，斜剪試驗之變數尚有剪切角度與預裂縫有無，單壓試驗之變數尚有水膠比與齡期。採環狀應變計控制與裂縫開口位移計控制求得完整之加載歷程，並以非破壞之聲射技術（acoustic emission, AE）觀察微震裂源，同時輔以電子斑紋干涉法（electronic speckle pattern interferometry, ESPI）相互比對，進行一系列之斜剪與單壓試驗。
從斜剪試驗之巨觀行為可發現，粒徑愈大其尖峰剪應力愈大，研判顆粒間互鎖效應更為顯著。無預裂縫試體之裂縫偏斜角θ可知，角狀顆粒試體隨著粒徑越大互鎖效應造成尖峰剪應力越大的情況，使之θ角增加；由斜剪試驗之微觀行為可觀察出，角狀顆粒較易產生互鎖之作用，當試體顆粒間錯動時，AE事件便大量增生，此外，粒徑越大，互鎖效應顯著，AE事件越多，叢聚時機更早。剪角較小時，試體尖峰剪應力、正向應力較大， AE事件便大量累積；反之則較少微裂。空間分佈方面，叢聚發生於試體中央處，爾後沿著剪切面逐漸衍生為巨觀裂縫。
從單壓試驗之巨觀行為可發現，粗粒料之互鎖效應相對於細粒料高，故強度較高。單壓強度隨水膠比減少而增加，拌合水之減少有助於強度之提升。試體單壓強度，隨齡期增長而提高；由單壓試驗之微觀行為可觀察出，顆粒越大AE事件越多。單壓強度越高，叢聚發生時機較早。其AE事件多寡與齡期有關，顯示齡期越長，試體強度越高，故AE事件較多。
兩種非破壞檢測技術之微觀量測資料確實可收相互印證之預期效果，得以求驗破壞演化過程及其相關之破壞特徵。

Tensile and shear failures are the major failure modes for rocks. This research performed uniaxial compressive and inclined shear tests to study the fracture behaviors of rock with the assistant of nondestructive measuring technique of AE (acoustic emissions) and ESPI (electronic speckle pattern interferometry). Test materials include paste, mortar, and concrete.
The effects of size and shape of the particles on the acoustic emissions during the loading process were the key factors to be studied. Several other factors were also studied such as inclined shear angle and pre-existing crack for inclined shear tests, water-cement ratio and age for uniaxial compressive tests. Complete loading curves were obtained by stroke-controlled loading process. The micro behavior of specimen was monitored by both AE and ESPI.
Test results of inclined shear tests show that, from the macroscopic point of view, peak shear stress increases with increasing particle size due to greater particle interlocking effect, and the inclination angle of crack also increases with particle size. From the microscopic point of view, specimens of angular particles tend to have much more AE events during the loading process. AE events increase and localize at lower load level with increasing particle size. For specimens sheared at lower inclined shear angle, both AE events and peak shear stresses increase due to higher normal stresses. Microcracks were observed to cluster at the central portion of specimen and triggered the macrocrack initiation at later stage.
For uniaxial compressive tests, strength of specimen increases with increasing particle size, increasing age, and decreasing water-cement ratio. AE events increase and localize at lower load level for specimens with large particle size. AE events increase with increasing age of specimen due to higher compressive strength.
The distribution and localization of microcracks observed by AE was consistent with the initial crack position observed by ESPI.

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