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首页> 外文会议>GeoShanghai International Conference; 20060606-08; Shanghai(CN) >Collapse Behavior of Unsaturated Compacted Soils
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Collapse Behavior of Unsaturated Compacted Soils

机译：不饱和压实土的坍塌行为

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This paper presents comprehensive results of a series of collapse tests on unsaturated compacted clay using a suction-controllable triaxial apparatus for identifying the collapse behaviour, which includes deformation characteristics such as volume changes and hydraulic characteristics such as degree of saturation changes. The collapse tests were conducted by decreasing the imposed matric suction from 147 to 0kPa step by step under constant isotropic net stresses. Experimental data show that the wetting-induced collapse deformation mainly depends on the initial density and mean net stress at which the collapse occurs, i.e., the denser the specimen or the larger the mean net stress, the smaller the collapse deformation. In addition, the soil-water characteristic curve obtained for an initial denser specimen tends to shift upwards in the S_r - lns plane, compared to an initially looser specimen. It is shown that the collapse mainly occurs in the suction range from 20 to 80kPa for the tested soil.
机译：本文介绍了使用可控吸力三轴仪对不饱和压实粘土进行一系列坍塌试验的综合结果，以识别坍塌行为，包括变形特征（例如体积变化）和水力特性（例如饱和度变化）。通过在恒定的各向同性净应力下逐步将施加的基质吸力从147降低到0kPa来进行坍塌测试。实验数据表明，湿润引起的塌陷变形主要取决于塌陷发生时的初始密度和平均净应力，即试样越致密或平均净应力越大，塌陷变形越小。另外，与最初较松散的标本相比，对于初始较密的标本获得的土壤-水特征曲线倾向于在S​​_r-lns平面中向上移动。结果表明，坍塌主要发生在被测土壤的20〜80kPa吸力范围内。

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