评估粘土 - 砾石混合物的强度特性

M. T. Akinleye¹, L. O. Salami¹, M. O. Salami²
1、阿德莱克大学土木工程系
2、伊巴丹大学土木工程系

摘要

剪切强度是几乎所有岩土工程问题中最重要的土壤特性之一。本研究旨在调查砾石对粘土剪切强度的影响。
两个粘土样品是从奥逊州奥索博不同地点的挖坑中获得的，砾石在当地收集。三种不同等级的砾石（2-6 mm、6-12
mm 和 12-20 mm）在干燥状态下分别以 5、10、15、20、30、40 和 50% 的比例与收集的粘土混合。首先，根据 BS
1377-3:2018 测定了粘土和砾石的一些物理特性，包括比重、粒度分析、液限和塑限。随后，根据 BS 1377（1990），
在 50、100 和 150 kN/m2 三种不同的约束压力下，以 0.5 mm/min 的加载速率对粘土 - 砾石混合物进行了加州承载比
（CBR）和固结 - 不排水（CU）三轴压缩试验。CBR 试验的结果表明，粘土 - 砾石混合料的 CBR 值高于纯粘土。
剪切强度的结果表明，随着砾石浓度从 0 到 50% 的增加，内聚力和有效内摩擦角也在增加。当砾石尺寸从 6-12 mm
增加时，有效内聚力减少，内摩擦角变大。可以得出结论，当地可用的砾石可以用来改善工程建设中粘土的强度特性。

关键词

粘土；砾石；粘土 - 砾石混合物；剪切强度；加利福尼亚承载率比

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