【摘要】 应用声发射技术和带中心竖向裂纹的矩形板试件确定混凝土裂纹失稳扩展临界点，并用边界元位移不连续法计算混凝土的断裂韧度ＫＩＣ，实验表明其断裂情况更接近混凝土特性．同时还研究了缝长对ＫＩＣ的影响．研究表明：在一定范围内，相对缝长对混凝土断裂韧度影响很小．更多还原

【Abstract】 The acoustic emission technique and rectangular plate with vertical crack in centre are applied to determine the critical point or non-steady propagation of concrete crack, and the fracture toughmess of concrete KIC is calculated by displacement discontinuous method of the B E M. The experiments show that the process of fracture are more close to the characterstic of concrete. At the same time, the effect of the ralative crack length (2a / H) on the fracture toughness KICis studied. It is found that the fracture toughness KIC is only slightly affected by the relative crack length (2a / H) within a certain scope.更多还原