| 许成顺,文利明,杜修力,徐海滨.不同应力路径条件下的砂土剪切特性试验研究[J].水利学报,2010,41(1): |
| 不同应力路径条件下的砂土剪切特性试验研究 |
| Experimental study on shear behaviors of sand under different stress path |
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| DOI： |
| 中文关键词: 剪胀剪缩特性 三轴拉伸 三轴压缩 应力路径 |
| 英文关键词: Shear dilatancy and shrinkage behaviors triaxial extension triaxial compression stress path |
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| 中文摘要: |
| 为了探讨不同应力路径条件下的砂土剪切特性，进行了8种不同应力路径的单调剪切试验。试验结果表明，在不同剪切路径条件下，砂土的剪切特性明显不同。即在压缩条件下的剪胀特性明显大于拉伸条件下的剪胀特性，而同样的压缩路径，减压压缩路径下的剪胀特性最显著，增压剪切路径下的剪胀特性最小，常规压缩路径下的剪胀特性在其中间。且相对于均等固结，在偏压固结条件下表现出更显著的剪胀特性。在不同剪切路径条件下，砂土所发挥的最大内摩擦角也有所不同，即在三轴拉伸条件下所发挥的内摩擦角普遍比三轴压缩条件下的内摩擦角大3°~4°，而在相同的压缩或拉伸条件下，内摩擦角以及临界状态应力比基本一致，与加载路径无关。 |
| 英文摘要: |
| In order to study shear behaviors of sand under different stress path, eight monotonic shearing tests with different stress path were performed. It shows that， under different stress path， shear dilatancy behaviors of sand are obviously different： it has more notable shear dilatancy behaviors under extension than under compression，in the case of compression，more notable shear dilatancy behaviors revealed under decompression compression path， and most unconspicuous shear dilatancy behaviors under pressurized shearing path， and its shear dilatancy behaviors under conventional compression path are between two former conditions. Under deviatoric stress consolidation， it shows more obvious shear dilatancy behaviors.And that，if stress paths are different，internal friction angles of sand are different，which is 3°-4°bigger under triaxial extension than under triaxial compression. Under the same condition of compression or extension， no matter what different stress loaded， all internal friction angles tend to the same stress ratio at the critical state ultimately. |
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