分析评估非饱和土壤中钢筋的抗拉能力

IF 4.7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL Geotextiles and Geomembranes Pub Date : 2024-06-28 DOI:10.1016/j.geotexmem.2024.06.003
Mahmoud Ghazavi, Abbas Mahboobi
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引用次数: 0

摘要

钢筋抗拔的有效相互作用机制包括土-固表面的表皮摩擦力、土-土剪切阻力以及对横向构件产生的压缩阻力。第三部分由被动侧压力(LPM)或承载力(BCM)方法获得。本文提出了一种分析解决方案,用于确定嵌入普通土和非饱和土中的土工格室、土工格栅和加固土工格栅的抗拔能力。对于非饱和土壤,采用了有效应力法。将解决方案预测的结果与文献报道的大规模拉拔试验结果进行了比较。结果表明,考虑二维和三维加固的 LPM 更符合实验结果。一般来说,土工格室和土工格栅的拉拔能力更多地取决于土工格室和土工格栅的摩擦肋-土界面和土-土剪切阻力。用 mpi 表示土工格室的延伸性,用 αpi 表示土工格室的柔韧性,建议第一、第二和第三排土工格室的 mpi 值分别为 1、0.7 和 0.3,第一排土工格室的 αpi= 0.4,第二排及以后各排的 αpi= 0.25。参数研究表明,最佳横向肋间距为等效肋厚度(Beq)的 50 倍以上。
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Analytical assessment of pullout capacity of reinforcements in unsaturated soils

The effective interaction mechanisms in the pullout resistance of reinforcements include skin friction mobilized at the soil-solid surface, soil-soil shear resistance, and compressive resistance created against transverse elements. The third component is obtained from passive lateral pressure (LPM) or bearing capacity (BCM) methods. An analytical solution is proposed to determine the pullout capacity of geocell, geogrid, and strengthened geogrids embedded in ordinary and unsaturated soils. For unsaturated soils, the effective stress approach was employed. The solution-predicted results were compared with those obtained from large-scale pullout tests reported in the literature. Results indicated that considering LPM for 2D and 3D reinforcements better agrees with experimental results. The mobilized frictional rib-soil interfaces and the soil-soil shear resistance components generally contribute more to the pullout capacity of the geocell and geogrid, respectively. For the extensibility represented by mpi and flexibility of geocell denoted by αpi, the values of mpi = 1, 0.7, and 0.3 for the first, second, and third row of geocell, αpi= 0.4 for the first row of geocell and 0.25 for the second and subsequent rows are suggested to be considered. Parametric studies showed that the optimum transverse rib spacing is over 50 times the equivalent rib thickness (Beq).

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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.
期刊最新文献
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