現今台灣隧道工程採用全斷面機械式機具進行開挖之案例日增，對於隧道施工鑽掘之安全與效率倍受重視。本研究以接觸破壞理論分析單一機械刀口與岩材承受貫壓之互制力學行為，乃至破壞之演化機理，並藉由建置具圍壓系統之貫切破壞實驗儀器設備，採用水泥砂漿及大理岩供作試驗材料，結合非破壞檢測之聲射(acoustic emission, AE)技術，探求微觀尺度之微震裂源定位，並與巨觀尺度下主要之裂縫初裂及延伸作比較研析。依宏觀及微觀之裂縫發展及其相關之力學行為，以側向圍壓與刀楔角度為試驗變數，資以探討大地應力及機械鑽刀對於貫切破壞行為之影響。
本研究之正向貫切試驗採用單一尖狀(tip with no wear flat)之楔形刀口進行貫壓，於無圍壓條件下以裂縫開口位移(crack mouth opening displacement, CMOD)控制；而有側向圍壓條件下，改用衝程控制，使兩者在破壞後不致於失穩開裂，以求取尖峰強度前後之完整加載歷程。
從巨觀破壞記錄觀察可知，側向圍壓之增加，其最大貫切力及其貫切深度隨之增大，而延性破壞之趨勢亦隨之增加；然而側壓對貫切壓力之影響則不甚敏感。同時經由微觀聲射技術所得微震裂源之比較分析，發現圍壓越大，可能發生脆性裂縫之初裂位置，及延裂路徑偏離貫切軸越大、彈-塑性界面半徑亦因之增加、其延或脆性破壞之趨勢亦與巨觀之結果相符。
再者，隨著貫切楔角之加大，最大貫切力亦因此增加，相對應之臨界貫切深度及峰前之貫切壓力則隨之下降。其裂縫生衍路徑，則較不受刀楔角度影響。而從微震裂源之觀察發現，隨楔角之漸增(即由尖變鈍)，叢聚現象將提早發生，且其位源集中區域，亦因此而漸靠近貫入點，在產生脆性破壞下，無因次化之彈-塑性區半徑，則明顯減小。
最後，將實驗所得之貫切壓力及無因次化之彈-塑性區半徑，與理論解析解比對驗證，本研究得到良好之對應。

Nowadays, for tunnel construction in Taiwan, the full-faced mechanical boring method is used more frequently due to the consideration on safety and efficiency. The objective of this research is to investigate the effects of in-situ stresses, which are simulated by different lateral confinement, and wedge angle on single-indentor cutting mechanism. By attempting to depict how a single indentation works, and to understand its principle of fracture progress over micro view, nondestructive technique of Acoustic Emission (AE) was used to monitor during indentation test. To set up a stable fracturing process, crack mouth opening displacement (CMOD) control was adopted in the case of free lateral confinement, and stroke control was used with confinement. Meanwhile, the wedge indentor tip with no wear flat was used to conduct a series of fracture experiments to detect the relation between micro-seismic locations and macro-fracture development.
For the influence of confinement on the indentation tests, results show that both the maximum indentation force and its corresponding penetration depth increase with increasing lateral confining stress, because of the tendency of ductile development. However, confining effect on the magnitude of indentation pressure is insignificant because of the concept of self-similarity. In unconfined case, the position of initial tensile crack occurs right underneath the indentor and propagates along symmetric vertical axis. On the other hand, tensile crack may or may not occur under confinement. Moreover, if fracture is possible to take place in the case of confinement, the tensile crack still originates on the critical elasto-plastic interface but not right underneath the indentor, and its propagation diverts significantly from vertical axis even just applies a small relative confinement (Ψ=0.1). Furthermore, experiments show that the radius of the elasto-plastic interfacial enlarges as adding lateral confinement.
With larger wedge angle, the maximum indentation force would increase, but the indentation pressure and the critical indentation depth would decrease. On the other hand, the direction of crack propagation did not change much with various wedge angles. Furthermore, the localization would occur earlier and the plastic zone interface would decrease with larger wedge angle.
At last, this research also demonstrated that the experimental results of the indentation pressure and plastic zone interface compared quite well with the formula of cavity expansion model.

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