论文部分内容阅读
高应力水平时堆石料的颗粒破碎对其强度和变形机理有重要影响。为此,本文对堆石料进行了固结应力从400kPa到4MPa的18组固结排水和固结不排水常规三轴压缩试验,及6组等向压缩试验。结果表明:(1)围压低时颗粒破碎轻微,固结排水时试样剪胀,固结不排水时孔压先增加后稍有降低;围压高时颗粒破碎严重,固结排水时试样剪缩,固结不排水时孔压也是先增加后降低;等向压缩时随着平均有效应力增加颗粒逐渐破碎,但不明显;(2)不同的固结应力时,在排水条件和不排水条件下试样都趋于临界状态;(3)堆石料的临界状态在q-p′平面和e-lgp′平面均为非线性变化。最后提出了堆石料的临界状态的数学描述并较好地验证了试验结果。
Particle crushing of rockfill material has an important influence on the strength and deformation mechanism at high stress levels. In this paper, 18 sets of consolidated drainage and consolidation undrained conventional triaxial compression tests of rockfill materials with consolidation stress from 400kPa to 4MPa and 6 sets of isotropic compression tests were carried out. The results show that: (1) When the confining pressure is low, the particles are crushed slightly, and the dilatancy of specimens is observed when the consolidation drainage is made. The pore pressure first increases slightly and then decreases slightly when the consolidation drainage is not drained. The shrinkage and consolidation did not drain the pore pressure is also increased after the first reduction; isotropic compression with the average effective stress increases the particles gradually broken, but not obvious; (2) different consolidation stress, the drainage conditions and undrained (3) The critical state of rockfill material is non-linear in both qp ’plane and e-lgp’ plane. Finally, the mathematical description of the critical state of rockfill materials is proposed and the test results are well verified.