過去對於岩石力學與工程之研究，多於巨觀行為之探討，對不同應力路徑下，微觀裂隙之生、衍等破壞特徵則較少觸及，究其因除受限於傳統力學試驗，相關之微觀非破壞檢測技術，仍有極大之進步空間。
因此本研究乃以同步化聲、光非破壞檢測技術應用於自行研發斜向剪切試驗儀，並調整水泥砂漿配比以模擬中等強度之類岩材料，進行研探岩材受剪行為下，其剪角（客體）與預裂（主體）之影響，冀能研探從微觀至巨觀之破壞機制，作為科學與工程應用之佐參。
基於平面應變之受剪狀態下，藉由變數之設置：（1）斜剪角度（β=50∼75°）、(2)預裂之幾何形狀（試體中央無預裂、扁長型與圓孔型預裂），與開口位移控制（COD）以求完整加載歷程。則可藉由聲射（AE）技術研探岩材內部受剪產生微震裂源（microseismic locations）之發生時機與空間分佈，並與電子斑紋干涉術（ESPI）所偵測之岩材外部因受剪變形引致之干涉影像同步比對，以研探類岩材料之三項破壞演化特徵：叢聚（localization）、初裂（initiation of crack）與裂衍（crack propagation）。
觀察無預裂及圓孔型斜剪試驗結果發現，隨剪角β增大（即正向應力降低），加載曲線之勁度與強度兩者隨之降低，在無預裂試體中，其破壞之裂衍角有反轉趨勢乃至其值亦隨之增大，亦即其產生之剪力破壞模式由相對高正向應力產生之壓－剪破壞（β＝ψ∼50°）；漸次變成相對低正向應力下，允許膨脹之單一裂縫（β＝50∼60°）或雙剪裂帶（β＝60∼75°）。
至於預裂對受剪行為之影響，圓孔型預裂試體中，預裂處有明顯應力集中的現象產生，其裂衍角會隨著剪角β增加而上升。而對AE事件分佈之特徵寬度λd之評估中，在無預裂狀態下隨著β的增加，其λd亦隨之增加，在相同剪角下，圓孔型預裂縫之λd大於無預裂試體。
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，未來可用此與斜剪試驗；進一步模擬相關岩體或節理之受剪行為。

Most of the experimental studies in rock mechanics and engineering were conducted in the viewpoint of macro-scale, and fewer micro-view researches focus on the fracture characterizations such as crack initiation and propagation in stressed rock due to the limitation of nondestructive techniques.This experimental study, therefore, aims at the synchronization of both acoustic and optical nondestructive techniques to investigate the effects of shear angle and pre-exist crack on rock-like material (mortar) under inclined shear tests.
Based on the plane strain condition of shearing specimen under COD (crack opening displacement) control, a series of experimental tests were performed to obtain entire loading curves by varying: (1) the inclined angleranged from 50 to 75°, and (2) the material geometry with or without pre-existing crack (penny and circular shapes in the middle of specimen). In conjunction of both AE (acoustic emission), used to detect the micro-seismic activities within the rock, and ESPI (electronic speckle pattern interferometry) techniques detected the deformation field on the rock surface, the evolution of fracture can be examined during the shearing process.
The results show that three fracturing characterizations have been verified corresponding to the inclined shear test: localization, crack initiation and propagation.
In addition, this study presents the effect of the inclined angle  on the shear stiffness, strength at failure, the crack propagation angle  as well as the different failure modes: mixed compression-shearing failure mode as =-50°due to the relatively high normal stress; dilation-allowed shearing mode with either forming a single shear zone
(= 50-60°) or bi-shear zone (= 60-75°) due to the relatively low normal stress. Specimen with pre-existing circular crack shows the stress concentration surrounding circular hole and the crack propagation angle  increases as increasing the shear angle .
Furthermore, experiments without pre-existing crack show that the larger the shear angle , the wider the width of the AE events, λd. Similarly, experiments with pre-existing circular crack display the wider λd. comparing with the one without pre-existing crack.
The use of AE can be used to detect the localization while ESPI can be used to verify crack initiation and propagation. Both results were compared each other and depicted a good agreement. By synchronizing both AE and ESPI techniques could also be adopted to examine the shearing mechanism in rock mass and joined rock as well.

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