| 非饱和粉土的液化特性研究 |
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| 引用本文： | 吴波,孙德安.非饱和粉土的液化特性研究[J].岩土力学,2013,34(2):411-416. |
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| 作者姓名： | 吴波 孙德安 |
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| 作者单位： | 1.上海大学 土木工程系，上海 200072；2.上海建工集团股份有限公司，上海 200080 |
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| 基金项目： | 上海市教委科研创新项目（No. 12ZZ093）；教育部博士点基金项目（No. 20093108110017） |
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| 摘 要： | 使用非饱和土动三轴试验仪，对非饱和粉土进行动力强度试验，探讨了饱和度、动应力比及固结围压对非饱和粉土动力强度特性、液化特性及孔压特性的影响。试验结果表明：（1）非饱和粉土的动强度随饱和度的增加而下降，在相同动剪应力比下饱和度与液化振次在半对数坐标上成线性关系；（2）非饱和粉土的液化与不液化的临界曲线近似成S型，非饱和粉土的抗液化能力随饱和度增大而降低，当饱和度小于60%时，土样不会液化；（3）非饱和粉土的动孔压随振次增大而增长，孔压的增长呈现出三段式的模式。
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| 关 键 词： | 非饱和粉土 动强度 液化 剪应力比 孔压 |
| 收稿时间： | 2011-11-24 |
Study of liquefaction characteristics of unsaturated silt |
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| WU Bo,SUN De-an.Study of liquefaction characteristics of unsaturated silt[J].Rock and Soil Mechanics,2013,34(2):411-416. |
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| Authors: | WU Bo SUN De-an |
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| Institution: | 1. Department of Civil Engineering, Shanghai University, Shanghai 200072, China; 2. Shanghai Construction Group Co., Ltd., Shanghai 200080, China |
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| Abstract: | The dynamic strength characteristics of unsaturated silt have been studied by using a dynamic triaxial testing apparatus for unsaturated soils. Some test results have been obtained, including the characteristics of dynamic strength, liquefaction and pore-water pressure under the conditions of different saturation degrees, shear stress ratios and cell pressures respectively. The test results show that (1)the dynamic strength decreases with increasing of saturation degree; the relationship between the saturation degree and cycle number is linear in the semi-logarithmic coordinates at failure under the same shear ratio; (2)the liquefaction critical curve of unsaturated silt approximates to be the S-shape; the liquefaction resistance is decreasing with the increasing of saturation degree; the liquefaction is no longer taken place when the saturation degree is less than 60%; (3)the pore-water pressure increases in a way of 3-stage with the increase of the cycle number. |
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| Keywords: | unsaturated silt dynamic strength liquefaction shear stress ratio pore pressure |
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