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首页> 外文期刊>Acta Geotechnica: An International journal for Geoengineering >Influence of the initial water content and dry densityon the soil-water retention curve and the shrinkage behaviorof a compacted clay
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Influence of the initial water content and dry densityon the soil-water retention curve and the shrinkage behaviorof a compacted clay

机译：初始含水量和干密度对土壤保水曲线和压实粘土收缩特性的影响

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The paper presents the results of an experi-mental study on the effects of the initial water content anddry density on the soil-water retention curve and theshrinkage behavior of a compacted Lias-clay. The initialconditions after compaction (initial water content and ini-tial dry density) have been chosen on the basis of threeProctor tests of different compaction efforts. According tothe eight chosen initial conditions clay samples have beencompacted statically. The relation between total suctionand water content was determined for the drying pathstarting from the initial conditions without previous satu-ration of the specimens. A chilled-mirror dew-pointhygrometer was used for the suction measurements. For theinvestigation of the shrinkage behavior cylindrical speci-mens were dried to desired water contents step-by-stepwithout previous saturation. The volume of the specimenswas measured by means of a caliper. Based on the testresults the influence of different initial conditions onthe soil suction and the shrinkage behavior is analyzed. Thesoil-water retention curves obtained in terms of thegravimetric water content are independent of the initial drydensity. At water contents above approximately 11-12.5%a strong influence of the compaction water content isobserved. At smaller water contents, the soil-water reten-tion curve is independent of the compaction water content.The results of the shrinkage tests show that the influence ofthe compaction dry density on the shrinkage behavior isnegligible. Similar to the drying behavior of saturatedsamples a primary and a residual drying process could bedistinguished. The primary drying process is stronglyinfluenced by the initial water content. In contrast, the rateof the volume change of the residual drying process isunaffected by the initial water content.
机译：本文介绍了初始含水量和干密度对压实Lias-粘土的土壤水分保持曲线和收缩行为的影响的实验研究结果。压实后的初始条件（初始含水量和初始干密度）是根据不同压实作用的三个Proctor试验选择的。根据选择的八个初始条件，对粘土样品进行了静态压实。从初始条件开始确定干燥路径的总吸力和含水量之间的关系，而无需事先使样品饱和。使用冷镜露点湿度计进行吸力测量。为了研究收缩行为，将圆柱形试样逐步干燥至所需的水分含量，而无需事先饱和。用卡尺测量样品的体积。根据试验结果，分析了不同初始条件对土壤吸力和收缩特性的影响。根据重量水含量获得的土壤-水保留曲线与初始干密度无关。当水含量高于约11-12.5％时，观察到压实水含量的强烈影响。在较小的含水量下，土壤水分保持曲线与压实含水量无关。收缩试验结果表明，压实干密度对收缩行为的影响微不足道。类似于饱和样品的干燥行为，可以区分一次干燥和残余干燥。最初的含水量对初次干燥过程有很大的影响。相反，残余干燥过程的体积变化率不受初始含水量的影响。

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