機械式鑽掘機於山岳隧道之開挖，可提升工程安全性及營建自動化之成效，惟因鑽掘切削之機制尚有不明處，因此產生切削刀頭之不當耗損，導致機械開挖之不彰;又台灣地質破碎;地下工程遭遇斷層、節理等弱面之機會大增，故本研究藉由將多刀楔掘削開挖斷面簡化為單一刀楔之正向貫切模擬，均質類岩(水泥砂漿)受無圍壓的側向自由邊界方式模擬側向開口不連續之弱面狀況進行探討，藉以瞭解相關貫切破壞機理，冀作增進其開挖效能之參考。試驗能建構二維貫切儀器架設作為探討課題，藉由改變:(1) 側向自由邊界距離貫切點之位置;(2)單一楔形刀角(wedge angle)等變數;於無側壓(stress free)狀況下，實驗排程採開裂變位(COD)控制以求得完整加載歷程，探討貫切所造成之破壞演化。本研究並結合非破壞之聲射(acoustic emission, AE)技術觀察微震裂源(microseismic locations)，並輔以電子點紋干涉術(ESPI)對照其微巨觀之脆性破壞特徵。
從貫切破壞過程的峰前行為得知，相同之楔形刀角之下於不同側向自由邊界位置之條件下，其標稱貫切壓力受側向自由邊界效應之影響極微，惟最大貫切力 及其對應之貫切深度d會隨著接近側向自由邊界位置之距離降低而減少。反之不同刀楔角度之下於相同側向邊界條件下時，標稱貫切壓力隨著刀角變大而降低。
由加載歷程之峰後的裂衍路徑觀之，本研究所定義之裂衍偏斜比(bi/hi)約趨於定值1/4，亦即裂衍路徑具形狀幾何自相似之特徵。但其初裂方位不受側向自由邊界之影響，均為垂直初裂，另由聲射技術之監測微震裂源和巨觀裂衍趨勢相符。故據以探求不同側向自由邊界之貫切過程中，峰前塑性區的延性破壞與後續於塑性邊界產生之脆性裂衍演化。
再從耦合聲光之非破壞檢測之互相比對得知，愈接近側向自由邊界之臨界彈塑性界面有縮小趨勢，從聲學之微震裂源定位，與光學觀察主要裂縫發展頗為一致。

Proper mechanical tunnel excavation in rock mass is capable to improve underground safety and automatic efficiency under construction. However, the complexity of contact mechanism during boring process raises with different geological conditions such as opening weak plane. To understand this difficult contact interaction, this study presents a cutting simulation by simplifying real excavation as a single, normal indentation on synthetic rock with varying wedge angle of cutter as well as lateral stress-free boundary. By changing the distance from indentation position to lateral stress-free boundary, the effect of opening weak plane on the damage evolution including the growth of plastic zone (ductile failure) and tensile crack propagation (brittle fracture) was monitored. The experimental results were conducted through a 2-D setup of indentation apparatus in laboratory. Using COD (crack opening displacement) as a feedback signal of closed-loop control system, the completely stable loading curve can be approached such that the crack path under indentation can be examined. Meanwhile, in conjunction of a nondestructive technique of Acoustic Emission (AE), the observation between both the visible-crack pattern and micro-crack development, which represented by micro-seismic activities of AE, reveals the characteristics of indentation fracture consistently. Furthermore, to monitor the effect of lateral free boundary on the crack propagation, crack path ratio (b/h) were proposed to measure. Experimental results show that the values of bi/hi keep invariant. In other words, the existence of geometrical similarity of b/h (1/4) was found during indentation. Additionally, the orientation of initial tensile crack is not affected by lateral stress-free boundary.
Furthermore, by comparing both results from coupled nondestructive techniques of AE and ESPI(electronic speckle pattern interferometry), it is found that the less the ratio of lateral distance(2b/W),the smaller the elasto-plastic interface. Regarding the brittle fracture, micro seismic locations obtained from AE and observed main crack from ESPI evolve a promising consistency.

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