张峰水库粗粒料三轴湿化试验研究

Triaxial Wetting Test of Rockfill Material from Zhangfeng Reservoir

通过对张峰水库两组粗粒料试样进行高压三轴湿化试验,分析了湿化后的剪切强度特征,以及湿化体积应变、湿化轴向应变与围压和应力水平的关系。结果表明:不同应力水平对湿化后强度特征的影响较小;在应力水平较低时,湿化体积应变基本不随围压和应力水平的变化而变化;无论是在较低应力水平下还是在较高应力水平下,湿化体积应变随着围压的增大会有所波动,但总体趋势呈随围压的增大而增大;湿化轴向应变在低应力水平下随围压变化产生的变化量很小;同种试样在同样的试验条件下,在水的润滑作用下,固结排气剪试验得到的抗剪强度较大,固结排水剪试验得到的抗剪强度较小,三轴湿化试验得到的抗剪强度居中。

A number of high pressure triaxial wetting tests were performed with two sets of rockfill material from Zhangfeng Reservoir in order to in-vestigate the shear strength feature after wetting and the relationship between slaking axial strain ,volumetric strain and ambient pressure and stress level. Furthermore,this article compared the related data of triaxial wetting text and triaxial compression text. It’s found that the different stress levels have little influence on the shear strength after wetting. Besides,it’s showed that the deformation characteristic of slaking axialstrain,volu-metric strain is related to not only ambient pressure but also stress level. When the stress level is low,volumetric strain will not change with the change of ambient pressure. While when the stress level is relatively high,the variation trend of volumetric strain is growing with the increase of ambient. The variation quantity of volumetric under low stress level with the change of ambient pressure is very small. Under the same test condi-tion,and the strength values of consolidated drained,triaxial wetting text and consolidated aerofluxus increase successively.