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Strength and consolidation characteristics of clay with geotextile-encased sand column

机译：土工织物包裹砂柱的黏土强度和固结特性

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摘要

Installing sand columns in clays is a common ground improvement technique used to treat soft soils, and the inclusion of geotextile to encase the sand column can further improve the performance of the reinforced clay composite. In this work, the shear strength and consolidation characteristics of clay, clay with an ordinary sand column (OSC) and clay with a geotextile encased sand column (GESC) were investigated by carrying out laboratory direct shear and oedometer tests to study the response of the reinforced clay composite under both lateral and vertical loading conditions. It was found that the OSC and GESC significantly increased the shear strength of the clay, mainly by improving the friction angle, with little impact on the apparent cohesion. Furthermore, the OSC and GESC reduced the compression index, swell index, and recompression index of the clay to some extent. The secondary compression indexes obtained from the reloading stage were lower than those from the initial loading stage, indicating that over-consolidated clay has a lower secondary compression index than normally consolidated clay. The coefficients of consolidation showed an upward trend as the effective consolidation stress increased. In addition, the compressibility and hydraulic conductivity tended to decrease with increasing effective consolidation stress.
机译：在粘土中安装砂柱是用于处理软土的常用地面改良技术，而土工布包裹砂柱可以进一步改善增强型粘土复合材料的性能。在这项工作中，通过进行实验室直接剪切和测压计测试来研究粘土，普通砂柱（OSC）和土工包裹砂柱（GESC）的剪切强度和固结特性，以研究粘土的响应。增强的粘土复合材料在水平和垂直荷载条件下都可以。发现OSC和GEC主要通过改善摩擦角而显着增加了粘土的剪切强度，而对表观内聚力几乎没有影响。此外，OSC和GESC在一定程度上降低了粘土的压缩指数，膨胀指数和再压缩指数。从再加载阶段获得的二次压缩指数低于从初始加载阶段得到的二次压缩指数，这表明超固结粘土的二次压缩指数低于正常固结粘土。随着有效固结应力的增加，固结系数呈上升趋势。另外，随着有效固结应力的增加，可压缩性和水力传导率趋于降低。

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