Abstract
Bearing capacity of belled pier foundation is critical in designing transmission lines in coarse saline soil region. This paper describes model test results on belled pier foundations. Axial uplift behaviours including failure modes, load-displacement curves, and ultimate uplift bearing capacity were discussed. The failure planes in four cases were obtained from pulled out cone-shaped bodies. An empirical equation was developed with a critical parameter of an uplift angle in design. Results indicate the range where the ground uplift shows circular extension at higher loads and the overall shear failure finally occurred. The load-displacement curves are primarily softening, and the uplift bearing capacity for coarse-grained saline soils (CSS) in the crystalline state increases at larger thickness, higher than that in dissolved state. Failure planes all exhibit approximately linear change from bottom to up. The angles of uplift for soils in crystalline and dissolved states can be taken as 34° and 18°, while 32° for the conventional for the sake of safety. Uplift behaviour of belled piers in CSS was modelled incorporating a practical interface model, with both failure planes and plastic range.
Highlights
Massive infrastructures have been designed and constructed in Northern China, such as the West-East electricity transmission project, and have to face the problematic soils, e.g., coarse-grained saline soils, especially those distributed in the Gobi Desert or the desert margin in inland areas [1, 2].e coarse-grained saline soils experienced cyclic salification and desalination due to complex processes that salt in soils periodically exists in crystalline or dissolved state, accompanied by a continuing migration and accumulation of dissolved salt, resulting in particular engineering properties [3, 4]
Experiments prove that this kind of problematic soils exhibits particular behaviours because of that better bearing capacity can be obtained as soils crystallized with good bonding between particles
The belled pier foundation is Advances in Civil Engineering frequently used in designing a transmission line. is kind of foundation well utilizes the bearing capacity of soils and has the merit that no redundant abandoned soils and water will be produced during construction [11, 12]
Summary
Massive infrastructures have been designed and constructed in Northern China, such as the West-East electricity transmission project, and have to face the problematic soils, e.g., coarse-grained saline soils, especially those distributed in the Gobi Desert or the desert margin in inland areas [1, 2]. E coarse-grained saline soils experienced cyclic salification and desalination due to complex processes that salt in soils periodically exists in crystalline or dissolved state, accompanied by a continuing migration and accumulation of dissolved salt, resulting in particular engineering properties [3, 4] Experiments prove that this kind of problematic soils exhibits particular behaviours because of that better bearing capacity can be obtained as soils crystallized with good bonding between particles. E uplift behaviours of the belled pier foundations including the apparent failure mode, ground displacement, loaddisplacement curves, and ultimate uplift bearing capacity were measured, aiming to provide guidance for the foundation design in coarse-grained saline soils Two occurrence modes and three different thicknesses for saline soils were considered. e uplift behaviours of the belled pier foundations including the apparent failure mode, ground displacement, loaddisplacement curves, and ultimate uplift bearing capacity were measured, aiming to provide guidance for the foundation design in coarse-grained saline soils
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