(1. 河南理工大學 能源科學與工程學院，焦作 454003；
2. 中國平煤神馬集團十礦，平頂山 467000)
摘 要: 基于平面假設標定的圓盤試件的無量綱應力強度因子對巖石斷裂韌度的準確測定有一定的影響。使用三維斷裂分析軟件FRANC3D對不同中心孔尺寸的中心圓孔平臺巴西圓盤HFBD試件的三維最大無量綱應力強度因子進行準確標定。結果表明：沿著圓盤厚度方向虛擬三維裂紋前緣各點的最大無量綱應力強度因子并不相等，其中心點與二維標定值最大誤差接近3%，推薦了一種不受三維尺寸影響可簡化為二維分析的中心圓孔平臺圓盤試件尺寸。
關鍵字: 中心圓孔圓盤試件；三維應力強度因子；巖石斷裂韌度
（1. School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China;
2. China Pingmei Shenma Group No.10 Coal Mine, Pingdingshan 467000, China）
Abstract:There was a certain effect to measure accurately the rock fracture toughness with holed disc specimens, of which the maximum dimensionless of stress intensity factor was calibrated with 2D method. By three-dimensional fracture analysis software FRANC3D, the maximum dimensionless of the stress intensity factor of disc samples was calculated, which has different radius sizes of center hole. The results show that the factors on the crack the front edge along the disc thickness direction are varied, even the maximum relative error of the center point is about 3%, compared to the value made with 2D method. A type of holed flattened Brazilian disc specimen is recommend, which can be simplified to a two-dimensional problem without three-dimensional size effect.
Key words: holed flattened Brazilian disc specimen; three-dimensional stress intensity factor; rock fracture toughness
