本研究進行II型雙裂縫試驗以探討無膠結石膏(完整石膏)與三種膠結劑：環氧樹脂(3：1)、環氧樹脂(1：1)、不飽和聚脂樹脂(POLY)，相互膠結製成的膠結石膏之II型破裂韌度。在膠結石膏方面將以岩石表面裂縫補強為主軸，分析其補強後之破裂韌度值分佈。並且在本研究試驗過程加入側向壓力，並研究側向壓力對各雙裂縫試體的影響。
本研究發現由完整石膏雙裂縫試驗得知，有側向壓力試體剪力強度明顯高於無側向壓力的試體，且其裂縫間距比必須介於0.1~0.25之間。當裂縫間距比大於0.4時，試體破壞路徑將不會沿著裂縫尖端垂直破壞，即不會形成剪切破壞，而是形成沿著裂縫尖端水平拉伸之拉力破壞。比較無側向壓力與有側向壓力下之雙裂縫試體發現，隨著側向壓力增加而裂縫尖端張應力會明顯減少，將有利於產生II型剪力破壞。在側向壓力下發現不飽和聚脂樹脂(POLY)為最適合裂縫補強之材料。
本研究進一步利用數值分析軟體ANSYS分析出各雙裂縫試體在側向壓力下之破裂韌度，最後利用破裂韌度迴歸曲線而得到破裂韌度迴歸公式。
利用本研究雙裂縫試驗參數代入前人(王凱正，2007)之單壓雙裂縫試體之II型應力強度因子(KII)迴歸公式，及最後本研究再以ANSYS分析模擬(Ko & Kemeny，2006)Flagstaff砂岩裂縫尖端破裂韌度，再與其利用FRANC2D/L分析結果相互驗證，發現側向壓力並不會影響裂縫幾何校正係數，且破裂韌度值誤差非常接近。

This study attempts to measure the Mode II (sliding mode) fracture toughness of intact gypsum and adhesive gypsum under the short beam compression testing. The gypsum is simulated as the rock-like material and three adhesives including Epoxy(3:1), Epoxy(1:1), Unsaturated Polyester Resin(POLY), are evaluated for their availabilities in surfacial crack repairing. The resulting values of Mode II fracture toughness are analyzed. The effect of confining stress is also investigated in this study.
The experimental setup is based on the configuration of the short beam compression with lateral confinement. This study examines the influence of the seperation of crack interval and the effect of confinement on the shear strength of the specimen. It is found that the testing condition is favorable for Mode II when the seperation ratio is between 0.1 and 0.25 for the unconfined test. When the seperation ratio exceeds above specified range, the fracture condition will result in an undesirable tensile failure. The increase in confining stress decreases tensile stress on the slot tip and hence obtains a favorable mode II condition. This study finds that the Unsaturated Polyester Resin(POLY) adhesive gypsum has the best response under confining condition.
This study also uses a finite element package ANSYS to evaluate the correlation equation of critical stress intensity factor (fracture toughness) for the short beam compression test. The regression formula for fracture toughness is derived. The regression formula derived from this study is also compared with the results obtained from Wang(2007) and Ko & Kemeny(2006). The comparison is found to be consistent.

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