傳統岩石直剪試驗礙於其封閉式剪切盒設計，僅能估求巨觀受剪行為下之強度參數，對於微觀剪力破壞機制則無法深入探究。本研究利用自行研發裂縫開口位移（crack opening displacement, COD）控制之斜向剪切試驗儀，其可視化剪力盒設計得以於試驗時搭配聲射法（acoustic emission, AE）與電子斑紋干涉術（electronic speckle pattern interferometry, ESPI）二種非破壞性檢測，分別由微觀角度探尋岩材內部與外部受剪之面內（in-plane）破壞行為。
基於平面應力之受剪狀態，藉改變岩材種類（天然岩材、人造類岩）、剪切角度（β=65°、70°、80°）及預裂縫形式（不同位置、形狀、方位）等影響因子，進行系列之岩材受斜剪破壞之完整加載歷程；AE訊號與破壞演化特徵之關聯性探討，並同步ESPI比對，為本研究主軸。
由人造之水泥砂漿與天然砂岩之破壞行為顯示，巨觀方面之勁度及尖峰強度發展，皆隨剪角增加而漸減。微觀方面則透過AE訊號之空間分佈圖系發現，叢聚（localization）位置皆為試體中央區域，說明利用人造「擬沉積岩」模擬天然沉積岩之適切性，也印證了前人利用人造類岩模擬天然岩材之結果。
試體受剪切試驗，其叢聚之時機約集中在加載比45~75 %，而初裂（crack initiation）時機約集中在加載比50~99 %。耦合二種非破壞性檢測，發現初裂時機之加載比幾乎發生於叢聚後5~25 %，相互印證了試體由內而外之破壞行為，也藉由非破壞性聲-光檢測配搭破壞性斜剪試驗之設置，獲得斜剪之完整受剪曲線，得求驗岩材受剪切試驗之破壞演化。

Traditional direct shear test for rock can only obtain the macroscopic strength parameters due to the closed-box design; it is not suitable for the microscopic investigation of the fracture mechanism. A set of open-box inclined shear test device with COD (crack opening displacement) control was designed and built to couple two nondestructive techniques: AE (acoustic emission) and ESPI (electronic speckle pattern interferometry). The internal and external in-plane fracture behavior of rocks under shearing could be probed by AE and ESPI, respectively, in view of microscopic.
The failure evolution of rocks under plane stress inclined shear test was studied mainly by AE, and was assisted by ESPI. Several other factors were also studied, such as rock type (natural rock, artificial rock), inclined shear angle (β = 65°, 70°, 80°), and pre-existing crack type (location, shape, orientation).
Test results show that, stiffness and peak shear stress decrease due to increasing inclined shear angle in the macroscopic point of view; localization position occurs at the middle part in AE event spatial distribution figures independent of rock type, which interprets that artificial “sedimentary-like” rocks behave resemble to natural sedimentary rocks, and furthermore verifies the usage of artificial rocks in the former studies.
Localization happens at about 45 to 75 percent of load level, as well as crack initiation at about 50 to 99 percent while specimens under inclined shear test. Coupling AE and ESPI found that, crack initiation occurs 5 to 25 percent of load level later than localization, which confirmed the failure evolved from the clusters of microcracks to the initiation and propagation of macrocracks. Moreover, by the setup of inclined shear test associated with nondestructive techniques, complete loading curves and the failure evolution of rocks were obtained.

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