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首页> 外文期刊>Geotechnical testing journal >Triaxial Tests on Compacted Clays for Consolidated-Undrained Conditions
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Triaxial Tests on Compacted Clays for Consolidated-Undrained Conditions

机译：固结排水条件下压实粘土的三轴试验

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Consolidated-undrained tests must be performed on compacted soils to provide undrained soil properties for embankment design scenarios, such as rapid drawdown. These soils are subject to anisotropic consolidation under field conditions. Laboratory testing of compacted clays must consider the effects of the consolidation stress system as well as the subtleties involved in testing initially unsaturated clay specimens. This study considers the effects of anisotropic consolidation on the undrained strength of a compacted lean clay. Strengths were measured using isotropically and anisotropically consolidated undrained triaxial compression tests. It was found that anisotropic consolidation has little effect on the undrained strength of compacted clay at vertical effective consolidation stresses below 50 kPa. As the consolidation stress increased, anisotropic consolidation was shown to decrease the undrained strength by 30 % at vertical effective consolidation stress of 300 kPa. It was also found that undrained strengths can increase by 50 % of more due to increases in relative compaction of a few %. Recommendations are presented for addressing the challenges of performing consolidated-undrained tests on compacted clays.
机译：必须在压实土壤上进行固结-排水试验，以为路堤设计方案（例如快速排水）提供不排水的土壤特性。这些土壤在田间条件下会发生各向异性固结。压实粘土的实验室测试必须考虑固结应力系统的影响以及测试初始不饱和粘土样本所涉及的细微差别。这项研究考虑了各向异性固结对压实贫粘土的不排水强度的影响。使用各向同性和各向异性固结不排水三轴压缩试验测量强度。发现在50kPa以下的垂直有效固结应力下，各向异性固结对压实黏土的不排水强度影响很小。随着固结应力的增加，在300 kPa的垂直有效固结应力下，各向异性固结会降低不排水强度30％。还发现，由于相对压实度提高几个百分点，不排水强度可以提高50％以上。提出了一些建议，以应对在压实粘土上进行固结不排水测试的挑战。

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