大地工程如壓力隧道、地下水庫、高岩覆之節理補強灌漿；工程地質如火成岩脈(dike)形成機理；能、資源之地下或經濟開發鑽採、放射廢料地下最終貯存等重要之大地課題，皆與固態岩材受內在液驅壓力引致開裂過程之力學機制相關，為探究此一議題，本研究自行建置複合式、微觀式之非破壞檢技術，結合聲射法(Acoustic Emission, AE)與斑點剪切干涉術(Speckle-shearing interferometry, SSI)於液驅式岩石破裂(Fluid-driven fracture)行為探討，進行實驗與理論分析之研究，據以進一步知悉液驅式岩石破裂特徵行為之巨、微觀破壞演化機理及其相關重要影響參數。
研究上，液驅加載儀設之建立，以環狀應變計為回授訊號控制液體加載速率，可穩定裂縫之開展，藉此獲得完整之加載歷程。試驗材料以人造水泥砂漿為擬脆岩材，並以試體材料之顆粒大小、滲透性與加載液體黏滯度為探討因子。實驗結果於巨觀行為顯示，由完整之加載曲線可求得液驅應力場下之峰前勁度、尖峰強度與峰後之變形行為；而尖峰強度與峰後變形速率將隨材料顆粒越小、滲透性越低與液體黏滯度越高而越高。
在微觀尺度下，聲射事件(AE event)叢聚(Localization)時機集中於峰後加載比99~95%之間，而第一條干涉條紋則產生在加載比99~100%處，顯示脆性材料在液驅破壞均向應力場作用下，破壞發生急遽，於峰前無明顯破壞徵兆顯現。比對材料內部聲射事件與試體外部之面外位移，可探求裂縫尖端位置，並估算裂縫開口寬度，據以與理論解析比對。

Concerning the crucial geo-mechanics projects such as pressure tunnel, grouting injection for jointed rock, geological formation of dike, exploitation of natural resources, and underground nuclear waste repository etc., different types of fluid-driven fracture are of the world-wide interests. This study reviewed the theoretical fluid-driven fracture model under the microscopic view. By establishing novel setup consisted of fluid-driven fracturing apparatus with coupling nondestructive techniques of acoustic emission (AE) and speckle-shearing interferometry (SSI), experimental examination will be conducted to identify this conceptual model.
In this research, a new loading instrument was designed to supply the fluid-driven motion, which can adjust the injection rate automatically according to the feedback from the extensometer. The stable crack propagation within material therefore was controlled and complete loading history can also be obtained. The specimens were made of cement mortar sand as a quasi-brittle rock. Some effects of factors such as grain size, permeability in solids; and viscosity in fluids were also investigated in this study.
Test results in macroscopic view show that the stiffness, peak strength, and the post-peak behavior can be investigate from complete loading curve and the peak strength will increase with decreasing grain size and permeability and increasing viscosity. In microscopic view, the localization of AE events and first fringe occurrence was found ranging between 99% to 95% at post peak stage and 99% to 100% at pre peak stage, respectively. This phenomenon shows that the fracture development of fluid-driven in brittle material will occur rapidly when load pressure reached the peak value. Coupled analysis of the AE event distribution and measured out-of-plane displacement can be used to trace the position of crack tip and estimate the crack opening width. The obtained crack opening width from experiment was used to compare with the one from theoretical solution.

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