宽级配砾石土水力劈裂特性的研究

国外采用宽级配砾石土作为土石坝防渗体已比较普遍，但对其水力劈裂特性的研究还很少。本文结合瀑布为高堆石坝防渗主料问题，对宽级配砾石上的水力劈裂特性进行了初步研究。研究结果认为：含砾量是决定宽级配砾石上是否发生水力劈裂的主要因素，当含砾量小于等于15％时，会发生水力壁裂，水力劈裂破坏压力值随试样干密度、加压速度和围压的增加而增大。

The property of hydraulic fracture of wide grading gravelly soil

Wide grading soil has been extensively untilized as impermeable core material ,but so far, little has been done on the study of its property of hydrofracture.This paper describes the achievements of a prelimianarystudy where the wide grading gravelly soil used comes from the high rockfill dam of Pubugou Project,The study shows that:(1)whether the hydrofracture occurs or not mainly depends on the travel content of samle,e.g.it occurs while the gravel content of sample is less that 15%;and (2)the failure pressure uf of hydrofracure increases with the increase of the dry desity of sample,the velocity of water injecting and the confining pressure.