本研究以砂岩作為試驗材料，先將岩樣裁切製成單裂縫矩型試體，再將其置於不同溫度下養護24小時後取出，並自然冷卻至常溫，透過五種不同組合之跨距進行四點彎曲試驗，並將破壞應力代入公式換算，得到I+II及II+III複合型斷裂韌度。本研究另外針對砂岩量測超音波及單軸抗壓等基本材料性質。
本研究利用不同跨距組合進行四點彎曲斷裂試驗，會得到不同斷裂韌度之數值。在I+II型試驗部分：五部種跨距會各別產生純I型、I+II複合型(偏I型)、I+II複合型(I、II各半型)、I+II複合型(偏II型)與純II型斷裂。在II+III型試驗部分：KIII值約為KII值之三倍。在加入溫度條件後，顯示溫度差升高會造成試體斷裂韌度降低及出現斷裂在加壓點之情況或斷裂在非預製裂隙上之斷裂樣態。

In order to measure the mixed-mode fracture toughness of rocks, single edge-cracked bending specimens under four-point bending configurations were proposed in this study. We selected sandstones as the testing materials. Two different experimental setups of four-point bending tests for modes I+II and II+III, respectively, were carried out in this study. There were five loading conditions for measuring the mode I+II fracture toughness and also five loading conditions for measuring the mode II+III fracture toughness. Another setups are thermal conditions which are 25°C,300°C,600°C. Theoretical formulas developed by Wang et al. (1979) for mode I+II fracture toughness and Tohgo et al. (1986) for mode II+III fracture toughness were adopted in the study. A series of experiments were conducted on these specimens. Correlations between mixed-mode fracture toughness and other mechanical properties were also discussed in this study. In addition to mixed-mode fracture toughness, experimental results include uniaxial compressive strength, dynamic Young’s modulus, dynamic Poisson’s ratio. For the cases of mode I+II testing, the loading conditions were chosen so that five fracture modes which were pure mode I, mode I+II for three, and pure mode II were achieved. It is observed that the fracture toughness in 25°C condition is higher than that in 300°C and 600°C conditions. For the cases of mode II+III testing, it is observed that the mode II fracture toughness is proportional to the mode III fracture toughness under the prescribed loading conditions.

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