本研究以電子斑紋干涉術（Electronic Speckle Pattern Interferometry , ESPI）為主，輔以聲射技術（Acoustic Emission , AE）， 針對壓、剪力兩種破壞模式，進行一系列探討。選用純水泥漿、水泥砂漿或混凝土作為人造類岩材料。
單壓試驗中藉由改變：（1）材料；（2）水膠比；（3）齡期；斜剪試驗改變：（1）顆粒大小；（2）預裂有無；（3）剪切角度等變數，採位移控制求得完整之加載歷程，並以非破壞之光學技術觀察初裂時機及位置。
單壓試驗隨齡期增加，巨觀裂縫由剪裂模式轉為劈裂，而加載歷程中，峰前勁度及尖峰強度有漸增之趨勢，峰後行為也由穩定型破壞 (classⅠ) 變成非穩定型破壞 (classⅡ)。由微觀角度，剪裂之初裂位置由試體旁邊開始發生，劈裂之初裂位置大約位於中央，且初裂時機比剪裂模式早。
根據斜向剪切試驗結果，相同剪角下，粒徑大小對尖峰強度無顯著影響，峰後行為隨粒徑越大，有越穩定趨勢；相同粒徑下，剪角增加，峰前勁度與尖峰剪應力有變小的趨勢，利用微觀非破壞檢測方法，初裂位置皆大略由試體中央發生，圓孔型預裂縫試體之初裂角至裂衍角漸漸受剪切盒束制影響，有變小趨勢。
利用聲射法觀察材料微裂之演化，可研判其叢聚之發生時機與其位置，再與電子斑紋干涉術所觀察到之初裂與裂衍位置比對，發現兩者所觀察到之破壞趨勢約略一致。

This research studied the fracture evolution of rock-like material under compressive and shear stress conditions by using ESPI (electronic speckle pattern interferometry) together with AE (acoustic emission) technique. Test materials include paste, mortar, and concrete.
Complete loading curves were obtained by stroke-controlled loading process. Both timing and location of the crack initiation was observed by nondestructive ESPI technique. Several factors were investigated, such as material type, water-cement ratio, age, grain size, and grain shape.
From the macroscopic point of view, for uniaxial compressive test specimens with increasing age, the fracture pattern changes from shear failure to splitting failure, pre-peak stiffness and strength also increases, and post peak behavior changes from class I to class Ⅱ. As observed by ESPI, the macrocrack initiated from the side of the specimen for shear fracture pattern, and the crack initiated from the central portion of the specimen for splitting fracture pattern at lower loading level.
For inclined shear tests at the condition of same inclined shear angle, test results show that grain size has no obvious effect on the strength and the post peak behavior tends to be more stable with increasing grain size. At the condition of same grain size, pre-peak stiffness and peak shear stress decreases with increasing shear angle. The macrocracks initiated more or less at the central portions of the specimens. The crack inclination angle decreases during crack propagation by the constraint of shear box for specimen with pre-existing central circular hole.
The locations of microcracks inside the specimens were observed by AE technique. The localization timing and position of microcracks were found to be consistent with the position of initial macrocrack as observed by ESPI.
Keywords: uniaxial compressive test, inclined shear test, age, pre-existing crack, crack initiation , propogation, electronic speckle pattern interferometry (ESPI).

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