摘要
根据直缝巴西圆盘（SNBD）试件计算应力强度因子的原理,设计组建了一套岩石Ⅰ、Ⅱ型断裂韧性测试系统,测定了岩石的Ⅰ、Ⅱ型断裂韧性,并与厚壁圆筒法的I型断裂韧性测试值进行了比较。根据试验结果,分析了试样尺寸、围压等因素对Ⅰ、Ⅱ型断裂韧性的影响。结果表明,研制的试验装置能够可靠地测出Ⅰ、Ⅱ型断裂韧性;试件厚度最好大于30 mm,初始裂缝半长与圆盘半径的比a/R为0.1-0.3时,可很好地确定Ⅰ、Ⅱ型断裂韧性;Ⅰ、Ⅱ型断裂韧性测试值均有随围压增大而增大的趋势。
Based on the principle of calculating the stress intensity factor of SNBD test piece, a fracture toughness test system for type-Ⅰ and type-Ⅱ rocks was designed. The fracture toughness of type-Ⅰ and type-Ⅱ rocks was tested, and the results were compared with the results of type-Ⅰ fracture toughness tested by thick-walled cylinder. According to the experimental data, the effects of sample size, confining pressure and other factors on the fracture toughness of type-Ⅰ and type-Ⅱ rocks were analyzed. The results show that the fracture toughness of type-Ⅰ and type-Ⅱ rocks can be tested by this experimental device with higher accuracy. The sample thickness is greater than 30 mm, and the fracture toughness of type-Ⅰ and type-Ⅱ rocks can be determined when the ratio of initial fracture half-length to disc radius（a/R） ranges from 0. 1 to 0. 3. The fracture toughness values of type-Ⅰ and type-Ⅱ rocks increase with the confining pressure increasing.
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2007年第4期85-89,共5页
Journal of China University of Petroleum(Edition of Natural Science)
基金
国家自然科学基金资助项目(50304010)和(9051005)
关键词
岩石
试件
断裂韧性
水力压裂
rock
test piece
fracture toughness
hydraulic fracture
作者简介
楼一珊（1964-），男（汉族），浙江诸暨人，教授，博士研究生，从事石油工程教学和科研工作。
