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首页> 外文期刊>Australian Geomechanics >ASSESSMENT OF THE POST-COMPACTION CHARACTERISTICS OF A SILTY SAND
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ASSESSMENT OF THE POST-COMPACTION CHARACTERISTICS OF A SILTY SAND

机译：粉质砂土的压实后特性评估

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Conventional field compaction control methods are effective at the time of placement. However, the discrete nature of these measurements and a limited depth of investigation can render them unsuitable for post-construction compaction quality assessments of deeper fills or larger surface areas. In this situation, classical destructive geotechnical surveys (i.e. boreholes, cone penetration tests) are sought to evaluate the current fill conditions. Nevertheless, these methods often do not provide the required level of information because only certain locations are tested and they have tremendous implications in terms of cost. The use of available non-destructive methodologies, such as shear wave velocity surveys (i.e. SASW, spectral analysis of surface waves or HVSR, horizontal-to-vertical spectral ratio) together with electrical resistivity tomography surveys (e.g. evaluation of water content), offers a valuable alternative to efficiently control compaction over large areas during post-construction stages and locate areas within the existing formations where the soil was not sufficiently compacted.This study explores the performance of a cost effective method for evaluating the characteristics of compacted fills by measuring the shear wave velocity and matric suction to evaluate the void ratio or dry density of compacted soil. Laboratory studies of compacted specimens were used to evaluate this method and their performance under different isotropic confining pressures. The results showed that the shear wave velocity and matric suction can effectively predict how the soil is compacted, but its success requires field measurements of both shear wave velocity and matric suction. The application of this relationship would enable practitioners to efficiently control compaction over large areas during post-construction stages, and locate areas within the existing formations where the soil was not sufficiently compacted.
机译：常规的现场压实控制方法在放置时是有效的。但是，这些测量值的离散性和有限的调查深度可能使其不适用于较深填充物或较大表面积的施工后压实质量评估。在这种情况下，寻求经典的破坏性岩土勘测（即钻孔，圆锥体渗透试验）来评估当前的填充条件。但是，这些方法通常无法提供所需的信息水平，因为仅对某些位置进行了测试，并且它们在成本方面具有巨大的意义。使用可用的非破坏性方法，例如剪切波速度调查（即SASW，表面波或HVSR的频谱分析，水平与垂直频谱之比）以及电阻层析成像调查（例如，水含量的评估），可以提供在施工后阶段有效控制大面积压实并定位土壤中未充分压实的现有地层中的区域的有价值的替代方法。剪切波速度和基质吸力来评估压实土壤的空隙率或干密度。压实样本的实验室研究用于评估该方法及其在不同各向同性围压下的性能。结果表明，剪切波速度和基质吸力可以有效地预测土壤的压实方式，但要成功地进行土壤的实测，必须同时测量剪切波速度和基质吸力。这种关系的应用将使从业人员能够在施工后阶段有效地控制大面积的压实，并在土壤中未充分压实的现有地层中定位区域。

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