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中文摘要：
为了评定混凝土大坝接缝灌浆质量及其稳定性，需要研究接缝灌浆发生剪切断裂的断裂特性并测定其相应的剪切断裂韧度。本文采用两端预留缝半边受力试件，进行了混凝土大坝接缝灌浆材料的剪切断裂试验，利用混凝土的导电特性对有限宽两端预留缝半边受力试件的断裂性能进行研究。结果表明，两端预留缝剪切断裂试件可以用来进行接缝灌浆材料的断裂试验及测定接缝灌浆材料的断裂韧度；剪切起裂点可能出现在灌浆缝与受压端的交界处，也有可能出现在灌浆缝与自由端的交界处；灌浆缝剪切断裂是一个逐渐扩展的过程，裂缝沿着灌浆缝直线或者曲线扩展；接缝灌浆材料的断裂韧度对试件高度和宽度存在尺寸效应，而对初始缝高比的尺寸效应不明显；接缝灌浆材料的导电性能随荷载和位移有显著的变化，可以用来确定该型试件剪切断裂的临界荷载。
英文摘要：
The shear fracture characteristics of joint-grouting are studied and corresponding mode Ⅱ fracture toughness is determined by experiments for assessing the quality and stability of grouting. The specimens for test are consisted of two concrete blocks, which are jointed together with grouting material with notches on upper and lower sides. The pressure load in test is exerted on one of the blocks. Two metal electrodes are placed at two side surfaces of specimens to measure the variation of conductivity reflecting the characteristics of fracture. The test results show that the shear crack always initiates either from the interface between grouting material and the block under pressure or the interface between grouting material and the free block. The shear fracture of the grouted joint expands gradually and the crack is linear or in curve size. A size effect of height and width of specimen on mode Ⅱ fracture tonghness exists. The conductivity of specimen varies remarkably following the variation of load and displacement. This characteristic can be used to determine the critical load of the specimen indicating the occurrence of shear fracture.
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