沥青混凝土水力劈裂及裂缝淤堵试验研究

Experimental Research on Hydraulic Fracturing and Crack Siltation in Asphalt Concrete

高土质心墙水力劈裂问题,是目前世界普遍关注又亟待解决的关键问题之一,判断心墙在蓄水条件下是否发生水力劈裂,将直接关系到大坝的安全与稳定.本文就针对这一问题,对沥青混凝土试件采用具有不同结构效应的厚壁空心圆柱体试件和圆形平板试件分别进行了水力劈裂和裂缝淤堵试验,结果表明,试件都是在内外水压差和发生径向变形之后才会发生水力劈裂,并且一定比重的膨润土对堵缝有较好的效果.

The problem of hydraulic fracturing of high soil core walls now the world universal attention and need to be addressed. Estimating whether the core wall under the condition of water storage the hydraulic fracturing occurring, will be directly related to the safety and stability of the dam. Aiming at the key prob- lem, through the asphalt concrete experimental study with different structural effect of thick hollow cylinder specimen and circular plate specimen, the hydraulic fracturing test and fracture siltation test are carried out. The results show that the specimen is in internal and external water pressure difference and after the radial de- formation, the hydraulic fracturing occurs; and a certain proportion of bentonite has good effect for crack silt- ation.