An Experimental Study of Nailed Soil Slope Models: Effects of Building Foundation and Soil Characteristics

Abstract

A soil nailing system is a proven effective and economic method used to stabilize earth slopes from the external (factors increasing the shear stress) and internal (factors decreasing material strength) failure causes. The laboratory models with scales of 1:10 are used to study the behavior of nailed soil slope with different soil and building foundation parameters. The models consist of Perspex strips as facing and steel bars as a nailing system to increase the stability of the soil slope. The models of sand beds are formed using an automatic sand raining system. Devices and instruments are installed to monitor the behavior of soil-nailed slope during and after construction. The effect of the soil type, soil slope angle, foundation width and position on the force mobilized in the nail, lateral displacement of the slope, settlement of the foundation and the earth pressure at the slope face, under and behind the soil mass at various foundation pressures, has been observed. It is found that the increase of soil density reduces both slopes facing displacement and building foundation settlements. The slope face displacement and footing settlement will increase with an increase in the width of the foundation and foundation position near the crest of the slope.

A Numerical Study of a Soil-Nail-Supported Excavation Pit Subjected to a Vertically Loaded Strip Footing at the Crest

“…The maximum wall horizontal deflection of 21.6 mm (Figures 3a and 4d) has been observed in the final stage of the excavation, and it was found to coincide with the toe of the un-socketed wall. These results coincided with the results obtained by [5]; through the experimental study of nailed soil slope models in medium-dense sand, they observed that the horizontal movement of the slope face increases with the construction stage and also with the excavation depth, and that their maximum deflection occurred in the vicinity of the toe of the slope face. For loose sand, the maximum deflection happened in the middle third of the excavation depth [5].…”

“…The axial stiffness (EA) wall and flexural rigidity (EI) wall of the shotcrete wall, with a thickness t, are given in (5), following the work of Garz ón-Roca et al [35]:…”

“…After conducting a series of laboratory experiments on a scale of 1:10 to examine the effect of footing pressure, soil type, soil slope angle, foundation width, and position on the nail force, slope lateral displacement, and foundation settlement [4,5], Mohamed et al [6] concluded that an FE analysis has the potential to replicate the behavior of the field-nailed soil slope during the construction and working stages.…”

Slope Reinforcement Model Scale Test With X-Block

“…While the soil nailing system is a technology for improving the soil that is used to stabilize slopes. The soil nailing system's behavior is determined by soil types and nailing parameters such as nail spacing, orientation, length, and technique of installation of nails, soil qualities, slope height and angle, and surcharge loading, among others [25].…”