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首页> 外文期刊>Arabian Journal for Science and Engineering >Enhancement of Clay–Sand Liners Using Crushed Limestone Powder for Better Fluid Control
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Enhancement of Clay–Sand Liners Using Crushed Limestone Powder for Better Fluid Control

机译：使用碎石灰石粉增强粘土砂衬层，以更好地控制流体

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摘要

Tunnel boring machine (TBM)-crushed limestone material is a fine powder obtained during tunnel excavations. This materialis proposed for use as smart filler in clay–sand liners, which include highly plastic clay and are typically used in wastecontainment applications and other fields. Replacing a part of bentonite in these liners with an inert, low plasticity materialis an efficient way of controlling the compressibility and reducing the swelling index. The objective of this study was to testthe water retention capacity under various mixture conditions. The soil–water characteristic curves for mixtures consistingof sand and 15% clay were investigated with regard to three main proportions: clay mixture consisting of one-third of TBMpowder and two-thirds of bentonite, clay mixture consisting of two-thirds of TBM powder and one-third of bentonite, and amixture consisting of only sand and bentonite. The geotechnical properties exhibited a clear improvement in the compressibilityand swellability of the clay–sand liner owing to the addition of TBM-crushed limestone filler. The clay–sand mixtureswere enhanced by adding crushed filler and could seal off the pores and voids, retain a satisfactory hydraulic conductivity,and prevent or minimize the flow through the layer. Scanning electron microscopy and X-ray investigations were performedfor the TBM limestone powder material mixed with commercial bentonite.
机译：隧道掘进机（TBM）压碎的石灰石材料是在隧道开挖过程中获得的细粉。提议将该材料用作粘土-砂衬里的智能填料，其中包括高塑性粘土，通常用于废物遏制应用和其他领域。用惰性的低塑性材料代替这些衬里中的部分膨润土是控制可压缩性和降低溶胀指数的有效方法。这项研究的目的是测试各种混合条件下的保水能力。从三个主要比例研究了由沙子和15％粘土组成的混合物的土壤-水特征曲线：由三分之一的TBM粉末和三分之二的膨润土组成的粘土混合物，由三分之二的TBM粉末组成的粘土混合物和膨润土的三分之一，以及仅由沙子和膨润土组成的混合物。由于添加了TBM压碎的石灰石填料，岩土工程性能在粘土-砂衬层的可压缩性和可溶胀性方面显示出明显的改善。通过添加压碎的填料可以增强粘土-砂的混合物，并且可以密封孔和空隙，保持令人满意的水力传导性，并防止或最小化通过层的流量。对掺有商业膨润土的TBM石灰石粉末材料进行了扫描电子显微镜和X射线研究。

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