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针对含边缘裂缝之砂岩试体受反平面剪力情形进行了III型断裂韧度量测试验,搭配相关所推导之理论公式求取砂岩III型断裂韧度。研究试验条件为无围压及单轴荷重加载下进行III型断裂试验,且针对试体受高温后之性质改变为变量条件加以探讨。研究结果表明,以该方式进行III型断裂韧度之量测,为可靠且稳定;砂岩经历温度在200℃前,试体III型断裂韧度会提升,之后呈现下降,到600℃,下降趋于平缓;随着烧结温度的提升,单压强度、动态杨氏模量、动态泊松比与III型断裂韧度皆有下降之趋势,且试体出现熔融样态,表面出现明显微裂纹。
For the sandstone specimens with edge cracks, the type Ⅲ fracture toughness test was carried out under the condition of anti-plane shear force, and the sandstone type III fracture toughness was calculated according to the relevant theoretical formula. The test conditions were type III fracture test without confining pressure and uniaxial load, and the conditions were changed to variables after the specimen was subjected to high temperature. The results show that the type III fracture toughness measured in this way is reliable and stable. The fracture toughness of specimen III increases after the sandstone experiences a temperature of 200 ℃, and then declines to 600 ℃. With the increase of sintering temperature, the uniaxial compressive strength, dynamic Young’s modulus, dynamic Poisson’s ratio and type III fracture toughness all decreased, and the specimen appeared melted and the surface showed obvious micro-cracks.