堆石料湿化变形三轴试验研究

Study on slaking deformation of rockfill materials by triaxial test

采用大型三轴仪分别进行各向等压及不同围压不同湿化应力水平条件下的三轴湿化试验,对堆石料在上述情况下的湿化变形特性进行研究。基于单线法,建立适合于堆石料湿化变形的新模型,通过研究湿化轴向变形及体积变形与围压以及湿化应力水平的关系,提出单线法湿化变形经验公式,并结合试验成果对堆石料的湿化模型参数进行拟合。研究结果表明:在各向等压条件下,湿化体积变形与轴向变形和围压的关系分别可用双曲线与直线表示;在围压一定时,偏应力引起的湿化体积变形与湿化应力水平的关系可采用线性拟合,而湿化轴向变形与湿化应力水平呈指数关系;拟合曲线与试验结果曲线较吻合,表明该模型能较好地反映堆石料湿化变形的特征,证实了该模型的合理性。

Large triaxial machine was used for the triaxial slaking tests under isotropic and different slaking stresses level with different confining pressures.The slaking deformation properties of the rockfill materials under the above mentioned conditions were analyzed.A new model that fits for the slaking deformation of rockfill was established based on the single-line method.The empirical formula of single-line method was established according to the analysis of slaking axial deformation and slaking volume deformation with slaking stress levels and confining pressures,and the model parameters were fitted from the test results.The results show that on the condition of isotropic,the relationship between slaking volume deformations and confining pressures can be expressed by hyperbolas,but the linear relation between the slaking axial deformation and confining pressures.For certain confining pressures,the slaking volume deformations which are caused by deviatoric stress are linear to the slaking stress levels,while the exponential relation between the slaking axial deformations and the slaking stress levels.The fitting value is identical with experimental curve and the properties of the rockfill materials are reflected well by the new model.So,the model is reasonable.