掺砾心墙料的中三轴渗透试验

为获得掺砾心墙料在复杂应力状态下的渗透性能,采用改进的中三轴仪进行了掺砾心墙料的渗透试验,研究了不同围压、土石比和水头差对掺砾心墙料渗透系数的影响。试验结果表明:土体围压越大,掺砾心墙料渗透系数越小,呈负指数形式递减;当围压增大到一定值时,土体很难被进一步压密,掺砾心墙料渗透系数基本不变;土石比越小,掺砾心墙料渗透系数越大,当砾石含量超过某一值时,掺砾心墙料渗透系数迅速增大;水头差较小时,不同的水头差对掺砾心墙料渗透系数几乎没有影响。

Permeability tests on middle triaxis of core wall mixed gravel

In order to obtain the permeability of core wall mixed gravel under complex stress conditions, permeability tests on core wall mixed gravel are carried out by modified middle triaxial apparatus. Thereafter, the effects of different confining pressures, soil-rock ratios, and water head differences on the permeability coefficient of core wall mixed gravel are studied. The test results show that the larger confining pressure is, the smaller permeability coefficient of core wall mixed gravel is, that is, the relationship between them is shown as a negative exponential function. When the confining pressure increases to a certain value, the permeability coefficient almost keeps unchanged because the soil particles are difficult to be further compressed. In addition, the permeability coefficient has a negative correlation with the soil-rock ratio and it increases rapidly when the gravel content exceeds a certain value. Moreover, when the water head difference is small, it has little or no effect on the permeability coefficient.