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为研究破碎岩体变形历程对其水沙渗流特性的影响,设计了一套水沙渗透系统,在MTS816系列电液伺服岩石力学试验机上进行了配径碎岩在2种不同变形历程下的渗透试验。研究表明:破碎岩石变形历程对其水渗流特性无明显影响;破碎岩石的孔隙率在一定范围时,水沙渗流过程中,其孔隙率会由于滤沙作用而降低,导致渗透率降低;有蠕变经历的破碎岩石在水沙渗流过程中更易于过滤沙粒,滤沙量较大,而溃沙量较小;破碎岩体初始孔隙率相同时,水压梯度的增加会导致滤沙量减少,溃沙量增加。给出了一个描述破碎岩体初始孔隙率与水压梯度对滤沙量综合影响的表达式,为破碎岩体突水溃沙的风险预测评估提供指导。
In order to study the effect of deformation process of rock mass on the seepage-flow characteristics of water and sediment, a set of water and sediment infiltration system was designed. On the MTS816 series electro-hydraulic servo rock mechanics testing machine, the infiltration of rock fragments with different deformation history test. The results show that the deformation process of crushed rock has no obvious influence on its water seepage characteristics. When the porosity of crushed rock is within a certain range, the porosity of sand will decrease due to the effect of sand filtration, which leads to the decrease of permeability. The experienced broken rocks are easier to filter sand particles in the process of seepage and sediment flow, the sand amount is larger and the amount of sand loss is smaller. When the initial porosity of fractured rock mass is the same, the increase of water pressure gradient will lead to the decrease of sediment concentration , The amount of sand loss increased. An expression describing the combined effect of the initial porosity and hydraulic gradient of the crushed rock mass on the amount of sediment is given, which can provide guidance for the risk prediction and assessment of the water inrush from the rock mass.