| 刘恩龙,覃燕林,陈生水,李国英.堆石料的临界状态探讨[J].水利学报,2012,43(5): |
| 堆石料的临界状态探讨 |
| Investigation on critical state of rockfill materials |
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| DOI： |
| 中文关键词: 堆石 颗粒破碎 临界状态 三轴试验 |
| 英文关键词: rockfill grain crushing critical state triaxial test |
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| 中文摘要: |
| 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 - lg p ′ 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。 |
| 英文摘要: |
| The grain crushing of rockfill materials with high stress level has significant influence on its strength and deformation mechanisms. The soil mechanics theory based on critical state concept can describe the stress-strain relationship of reconstituted soil materials successfully， but currently for rockfill，few studies are conducted on influence of grain crushing on critical states and mathematical description ofcritical state line. The consolidation drained and undrained triaxial compression tests of 18 sets with consolidation stress ranging from 400kPa to 4MPa and isotropic compression tests of 6 sets were conducted on rockfill materials. The results demonstrated experimentally that：（1） when the consolidation confining pressure was low， soil particles crushed slightly， the samples dilated under drained conditions and the pore pressure increased firstly then reduced slightly； when the consolidation confining pressure was high， soil particles crushed heavily， the samples contracted under drained conditions and the pore pressure increased also firstly then reduced slightly； for the isotropic compression tests， with the increase of mean effective stress the soil particles broke up gradually but very small；（2） for all the consolidation confining pressures， the samples tended to critical state under drained and undrained conditions；（3） the critical state of rockfill in q-p′ plane and e-lgp′ plane behaved nonlinear. Finally a formula describing the critical state of rockfill was proposed and verified well with test data. |
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