Parameters affecting performance of fully instrumented model testing of strip footings on geocell-reinforced soils

IF 4.7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
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Abstract

A thorough study was conducted to assess the performance of the strip footing reinforced with geocells in sand, focusing on understanding the enhancement effects and geocell reinforcement mechanisms. Critical factors such as geocell modulus, height, soil relative density and load eccentricity were examined through fully instrumented model tests. Measurements included surface displacement profiles, strains on the geocell layer, subsurface pressure distribution and other relevant parameters. Results revealed that the strip footing on geocell-reinforced sand beds exhibited better performance compared to those on unreinforced soil, characterized by increased load-carrying capacity and reduced settlements. Notably, stiffer geocells improved performance significantly, with a 40% higher modulus enhancing the bearing pressure by up to 25%, due to better confinement and anchorage effects. Conversely, geocells with a lower modulus demonstrated more effective vertical stress distribution. Furthermore, increased geocell height moderately enhanced footing performance by improving confinement, although wall buckling under eccentric loading limited major gains. Dense soils under centric loading exhibited up to a 20% better improvement in bearing pressure than loose soils due to higher strain mobilization within the geocell layer. These findings highlight the crucial role of geocell and soil properties, as well as loading conditions, in optimizing reinforcement effects for strip footings.

影响土工格室加固土上条形基脚全仪器模型试验性能的参数
为评估砂土中使用土工格室加固的条形基脚的性能,我们进行了深入研究,重点是了解增强效应和土工格室加固机制。通过全仪器模型试验,对土工格室模量、高度、土壤相对密度和荷载偏心率等关键因素进行了研究。测量包括表面位移曲线、土工格室层的应变、地下压力分布和其他相关参数。结果表明,与未加固的土壤相比,土工格室加固砂层上的条形路基具有更好的性能,其特点是承载能力提高,沉降减少。值得注意的是,较硬的土工格室能显著提高性能,由于更好的约束和锚固效果,模量高出 40% 的土工格室能将承载压力最多提高 25%。相反,模量较低的土工格室则表现出更有效的垂直应力分布。此外,增加土工格室的高度可通过改善密闭性适度提高基脚性能,但偏心荷载下的墙体屈曲限制了主要收益。由于土工格室层内的应变调动能力较强,因此在中心荷载作用下,致密土的承压力比松散土高 20%。这些发现强调了土工格室和土壤特性以及加载条件在优化条形基脚加固效果方面的关键作用。
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来源期刊
Geotextiles and Geomembranes
Geotextiles and Geomembranes 地学-地球科学综合
CiteScore
9.50
自引率
21.20%
发文量
111
审稿时长
59 days
期刊介绍: The range of products and their applications has expanded rapidly over the last decade with geotextiles and geomembranes being specified world wide. This rapid growth is paralleled by a virtual explosion of technology. Current reference books and even manufacturers' sponsored publications tend to date very quickly and the need for a vehicle to bring together and discuss the growing body of technology now available has become evident. Geotextiles and Geomembranes fills this need and provides a forum for the dissemination of information amongst research workers, designers, users and manufacturers. By providing a growing fund of information the journal increases general awareness, prompts further research and assists in the establishment of international codes and regulations.
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