中文摘要：

通过楔劈拉伸试验，探讨了聚丙烯纤维掺量对聚丙烯纤维高强混凝土断裂韧度（KpIC）、断裂能（GpF）和临界裂缝嘴张开位移（δpmc）的影响。结果表明：在聚丙烯纤维掺量为0．6～1．5kg／m^3时，聚丙烯纤维对KpIC基本没有影响，但可以提高GpF和δpmc：随着聚丙烯纤维掺量的增加，KpIC和断裂韧度增益比没有显著变化，GpF和断裂能增益比均有不同程度的提高，δpmc有减小的趋势，临界裂缝嘴张开位移增益比没有明显的变化规律性。聚丙烯纤维主要改善高强混凝土的裂后行为。在试验的基础上，建立了KpIC，GpF，δpmc的计算关系式。

英文摘要：

Through wedge splitting tensile test, the effect of the polypropylene fiber dosage upon the stress intensity factor （GpIC）, fracture energy （GpF） and critical crack mouth opening displacement （δpmc） of polypropylene fiber reinforced high-strength concrete （HSC） were studied. The results show that the addition of polypropylene fiber （0.6--1.5 kg/m^3） has no impact on the stress intensity factor, but increases the fracture energy and critical crack mouth opening displacement of HSC. With the increase of the dosage of polypropylene fiber, KpIC and its increment ratio do not increase significantly. GpF and its increment ratio increase respectively, but δpmc decreases and the variation of the increment ratio of δpmc has no regularity. Polypropylene fiber mainly improves the properties of HSC at the post-cracking zone. Based on the experimental data, the formulae of calculating KpIC GpF and δpmc are proposed.