某板岩粗粒料湿化特性三轴试验研究

Triaxial tests on wetting deformation behavior of a slate rockfill material

对某板岩粗粒料进行了大型三轴湿化变形试验,分析了湿化体积应变、湿化剪应变等随围压、应力水平变化关系。试验结果表明:湿化体积应变、湿化剪应变随着围压增大或应力水平的提高而增大。利用试验结果研究了沈珠江湿化变形模型对试验所用的板岩粗粒料的适用性。结果显示,沈珠江模型不能满意地反映湿化体积应变,但是,能较好地反映湿化剪应变与应力状态的关系。分析湿化后剪切强度性质,发现不同应力水平下湿化对粗粒土的强度指标影响很小。

A number of large-scale triaxial tests are performed to investigate the wetting deformation behavior of a slate rockfill material. The relationship among wetting volumetric strain, shear strain, confining pressure and stress level is analyzed. The test results show that the wetting volumetric strain and the shear strain increase with the increase of both the confining pressure and the stress level. Using the test results, the applicability of Shen＇s wetting deformation model is verified for the test soil. It is found that Shen＇s wetting deformation model can not satisfactorily reflect the wetting volumetric strain, but it can suitably reflect the relationship between the wetting shear strain and the stress state. By analyzing the shear strength behavior after wetting, the wetting under different stress levels has little influence on the strength parameter of the coarse-grained soil.