Abstract
In order to analyze the uplift bearing capacity of transmission tower foundation in the geosythetic‐reinforced aeolian sand, a series of simplified indoor modeling tests are carried out. A simplified reduced‐scale foundation made according to the prototype and the uplift bearing capacity of transmission tower foundation in geosynthetic‐reinforced aeolian sand is studied. Three kinds of reinforcement materials are embedded in the sand according to five ways of layout spacing. A total of 15 reinforcement schemes are tested. The results show that ultimate uplift bearing capacity of transmission tower foundation can be significantly improved by the reinforcement treatment of geotechnical materials in the aeolian sand. The type and spacing of reinforced materials also have a significant influence on the uplift bearing capacity of the foundation model in reinforced aeolian sand, and the effect of reinforcement works until the end of the loading process. The comprehensive effect is evaluated by the ratio of bearing capacity improvement and the total layer of reinforced materials. Based on the above results, the bearing mechanism of transmission tower foundation in geosynthetic‐reinforced aeolian sand is elaborated and analyzed in detail.
Highlights
Simplified Modeling TestThe indoor model tests of the plate foundation in aeolian sand-reinforced composite ground with different materials and vertical spacing of reinforcement layers are conducted
(2) According to the second inflection point, the ultimate uplift capacity of model foundation can be significantly improved after the reinforcement treatment of geotechnical materials for aeolian sand
Compared with the nonreinforced soil, the ultimate uplift capacity of biaxial plastic geogrid (BPG) with the space of 50 mm and 300 mm is increased by 10% and 43% and that of steel plastic geogrid (SPG) is 4% to 41%. e uplift bearing capacity increase of geotextile is from −1.6% to 15% with the space of 50 mm and 200 mm
Summary
The indoor model tests of the plate foundation in aeolian sand-reinforced composite ground with different materials and vertical spacing of reinforcement layers are conducted. Aeolian sand from the desert and its reinforced composite soil are used as the uplift ground in the model tank, and the tested soil is from the aeolian sand in Taklimakan Desert of China. The influence of two factors, A (geotechnical material) and B (layout spacing), on the uplift bearing capacity of the composite soil and foundation model are investigated. The uplift bearing capacity test of a foundation model in unreinforced aeolian sand is added, which is recorded as T0. E last load value measured during the maintenance of each displacement level is regarded as the bearing capacity of the model, and the maximum displacement of the test is not less than 100 mm. Liu et al [30] and Kulhawy and Hirany [31] used this method to determine the ultimate bearing capacity of spread foundation and drilled piles
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