掺软岩粗粒料的湿化试验研究

Study on Wetting Test of Coarse Grained Material Mixed with Soft Rocks

堆石料填筑完成后,初次蓄水可造成不可忽略的湿化变形。采用GDS土动三轴仪对软岩含量为20%的粗粒料进行单线法和双线法湿化试验,获得了不同围压、应力水平下试样的湿化应力应变关系及其轴向变形,并对比研究了单线法和双线法的湿化变形经验公式的差异。结果表明,掺软岩粗粒料三轴剪切应力应变曲线均为应变软化型,湿化应变随围压和应力水平的增大而增大,且与应力水平呈指数型关系;在应力水平较小时,单线法和双线法湿化应变计算的经验公式计算值差距较小,在应力水平较大时,双线法经验公式计算值比单线法大。

The first storage can induce wetting deformation of the rock fill engineering, which cannot be ignored. In this study, wetting tests of single line and double line methods by GDS dynamic triaxial apparatus have been performed on the coarse grained material mixed with 20% content of soft rock. The wetting strain stress curves and its axial deformation of samples were obtained under different confining pressures and stress. The differences of empirical formulas of wetting deformation for single line and double line methods were compared. The results show that the strain stress curve belongs to the type of strain soften. The wetting stain increased with the increasing of confining pressure and stress. The wetting strain was an exponential relationship with the wetting stress. When the stress is low, the deviation of wetting strain by the single line and double line methods is smaller. While the stress is high, the situation is contrary.