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首页> 外文期刊>Proceedings of the Institutuion Civil Engineers >Field behaviour of granular pile-anchors in expansive soils
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Field behaviour of granular pile-anchors in expansive soils

机译：膨胀土中粒状桩锚的场性

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摘要

Different innovative foundation techniques have been suggested for controlling the detrimental volume change behaviour of expansive soils. The efficacy of a recent innovation in the form of granular pile-anchors in controlling heave of expansive clay beds and improving the engineering behaviour of the ambient soil has also been reported, based on results obtained from laboratory model tests. Before suggesting granular pile-anchor foundations for installation in field practices, however, an in situ study of the behaviour of granular pile-anchors is also required as a support to the laboratory study. This paper describes an extensive field study of the behaviour of granular pile-anchor foundations of expansive clay beds. The field study was performed to study the rate of heave, reduction of heave and variation of heave with radial distance and with depth. Heave was found to be reduced by about 90% upon installation of granular pile-anchors. Final heave was reached in just about half the time required for final heave in the case of an unreinforced expansive clay bed. Improvement in the engineering behaviour of the ambient clay was studied through Proctor needle penetration tests and unconfined compression tests. It was found that a maximum increase of about 120% was observed in penetration resistance in the case of expansive clay beds reinforced with granular pile-anchors.
机译：已经提出了不同的创新地基技术来控制膨胀土的有害体积变化行为。基于实验室模型测试的结果，还报道了以粒状桩锚形式进行的最新创新在控制膨胀黏土床的沉沉和改善周围土壤的工程性能方面的功效。但是，在建议在现场实践中安装粒状桩锚基础之前，还需要对粒状桩锚的性能进行原位研究，以为实验室研究提供支持。本文描述了膨胀黏土床的粒状桩锚基础行为的广泛研究。进行了现场研究，以研究升沉率，升沉减少和升沉随径向距离和深度的变化。发现安装粒状桩锚后，沉陷减少了约90％。对于未增强的膨胀黏土床，最终升沉仅需进行最终升沉所需时间的一半左右。通过Proctor针刺试验和无边压缩试验研究了环境粘土工程性能的改善。发现在用粒状桩锚加固的膨胀粘土床的情况下，观察到的抗穿透性最大增加了约120％。

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