Faculty of Engineering & Built Environment, Universiti Kebangsaan Malaysia, Bangi UKM, Selangor, Malaysia.
School of Civil Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, Skudai, Johor, Malaysia.
PLoS One. 2020 Dec 17;15(12):e0243293. doi: 10.1371/journal.pone.0243293. eCollection 2020.
The main cause of problematic soil failure under a certain load is due to low bearing capacity and excessive settlement. With a growing interest in employing shallow foundation to support heavy structures, it is important to study the soil improvement techniques. The technique of using geosynthetic reinforcement is commonly applied over the last few decades. This paper aims to determine the effect of using geogrid Tensar BX1500 on the bearing capacity and settlement of strip footing for different types of soils, namely Al-Hamedat, Ba'shiqah, and Al-Rashidia in Mosul, Iraq. The analysis of reinforced and unreinforced soil foundations was conducted numerically and analytically. A series of conditions were tested by varying the number (N) and the width (b) of the geogrid layers. The results showed that the geogrid could improve the footing's bearing capacity and reduce settlement. The soil of the Al-Rashidia site was sandy and indicated better improvement than the other two sites' soils (clayey soils). The optimum geogrid width (b) was five times the footing width (B), while no optimum geogrid number (N) was obtained. Finally, the numerical results of the ultimate bearing capacity were compared with the analytical results, and the comparison showed good agreement between both the analyses and the optimum range published in the literature. The significant findings reveal that the geogrid reinforcement may induce improvement to the soil foundation, however, not directly subject to the width and number of the geogrid alone. The varying soil properties and footing size also contribute to both BCR and SRR values supported by the improvement factor calculations. Hence, the output complemented the benefit of applying reinforced soil foundations effectively.
在一定荷载下，导致土壤出现问题的主要原因是承载能力低和沉降过大。随着人们越来越倾向于采用浅基础来支撑重型结构，研究土壤改良技术变得尤为重要。在过去几十年中，土工合成材料加固技术得到了广泛应用。本文旨在确定使用 Tensar BX1500 土工格栅对伊拉克摩苏尔不同类型土壤（即 Al-Hamedat、Ba'shiqah 和 Al-Rashidia）的条形基础的承载能力和沉降的影响。通过数值和分析方法对加筋和未加筋土基础进行了分析。通过改变土工格栅层数（N）和宽度（b）测试了一系列条件。结果表明，土工格栅可以提高基础的承载能力并减少沉降。Al-Rashidia 场地的土壤为沙质，其改良效果优于其他两个场地（粘性土）。最佳土工格栅宽度（b）为基础宽度（B）的五倍，而没有获得最佳土工格栅数量（N）。最后，将极限承载力的数值结果与分析结果进行了比较，比较表明两者之间具有良好的一致性，且与文献中公布的最优范围一致。研究结果表明，土工格栅加固可能会改善地基土，但不能仅通过土工格栅的宽度和数量来直接实现。不同的土壤特性和基础尺寸也会影响改进因子计算所支持的 BCR 和 SRR 值。因此，该结果补充了有效应用加筋土基础的好处。
