关键词: 破碎岩体, 突水溃沙, 变形历程

Abstract: In order to study the impact of deformation history of broken rock on the water-sand seepage characteristics, a set of water and sand permeable system has been designed. The permeability test of distribution diameter rock fragmentation in MTS816 series of electro-hydraulic servo controlled rock mechanical test machine has been conducted under two different deformation experience. The results have shown that the broken rock deformation experience has no obvious effect on the water seepage characteristics. In addition, when the broken rock porosity is within a certain range, the porosity will reduce due to sand filtering effect and result in permeability reduction in the water and seepage process. And broken rock with creep history are easier to filter the sand in the water and seepage process. Sand filtering quality are relatively more, and sand inrush quality are less. When the initial porosity of broken rock are the same, the increase of hydraulic gradient can lead to decrease of sand filtering and increase of sand inrush. An expression to describe the comprehensive influence of the initial porosity of broken rock and hydraulic gradient on the amount of sand filter has bee given in the paper, which supports the risk prediction and assessment of water bursting and sand inrush of broken rock.

Key words: broken rock, water and sand inrush, deformation history