Numerical experiments of soil nails in loose fill slopes subjected to rainfall infiltration effects

2005 ◽  
Vol 32 (4) ◽  
pp. 290-303 ◽  
Author(s):  
C.Y. Cheuk ◽  
C.W.W. Ng ◽  
H.W. Sun
Keyword(s):  
Numerical Experiments ◽  
Rainfall Infiltration ◽  
Soil Nails ◽  
Loose Fill

Influence of soil nail orientations on stabilizing mechanisms of loose fill slopes

2013 ◽  
Vol 50 (12) ◽  
pp. 1236-1249 ◽  
Author(s):  
C.Y. Cheuk ◽  
K.K.S. Ho ◽  
A.Y.T. Lam
Keyword(s):  
Earth Pressure ◽  
Slope Movement ◽  
Numerical Analyses ◽  
Soil Nails ◽  
Soil Nail ◽  
Static Liquefaction ◽  
Liquefaction Failure ◽  
Loose Fill ◽  
Typical Design

Soil nailing has been used to upgrade substandard loose fill slopes in Hong Kong. Due to the possibility of static liquefaction failure, a typical design arrangement comprises a structural slope facing anchored by a grid of soil nails bonded into the in situ ground. Numerical analyses have been conducted to examine the influence of soil nail orientations on the behaviour of the ground nail–facing system. The results suggest that the use of steeply inclined nails throughout the entire slope could avoid global instability, but could lead to significant slope movement especially when sliding failure prevails, for instance, due to interface liquefaction. The numerical analyses also demonstrate that if only subhorizontal nails are used, the earth pressure exerted on the slope facing may cause uplift failure of the slope cover. To overcome the shortcomings of using soil nails at a single orientation, a hybrid nail arrangement comprising nails at two different orientations is proposed. The numerical analyses illustrate that the hybrid nail arrangement would limit slope movement and enhance the robustness of the system.

Laboratory and field evaluation of several types of soil nails for different geological conditions

2016 ◽  
Vol 53 (4) ◽  
pp. 634-645 ◽  
Author(s):  
Y.M. Cheng ◽  
S.K. Au ◽  
Albert T. Yeung
Keyword(s):  
Field Tests ◽  
Field Evaluation ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Soil Nails ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Geological Conditions ◽  
And Performance ◽  
Loose Fill

For steep slopes with difficult access or slopes in a corrosive environment, there are various problems associated with the use of conventional steel reinforcement bars as soil nails. For loose-fill slopes or clay slopes, the development of adequate nail bond strength is another practical issue that should be considered. Carbon fiber–reinforced polymer (CFRP) and glass fiber–reinforced polymer (GFRP) in several forms and installation methods have been studied as the alternatives to the classical steel bar. Extensive laboratory tests on the materials and field tests on different types of soil nails with various methods of installation have been carried out in Hong Kong, Korea, and Australia. Test results support the use of these materials with an innovative installation method as soil nails under different geological conditions, and the suitability and performance of these materials under different conditions are assessed in the present study.

Loose Fill Slope Stabilization with Soil Nails: Full-Scale Test

2008 ◽  
Vol 134 (3) ◽  
pp. 277-288 ◽  
Author(s):  
J. Li ◽  
L. G. Tham ◽  
S. M. Junaideen ◽  
Z. Q. Yue ◽  
C. F. Lee
Keyword(s):  
Full Scale ◽  
Full Scale Test ◽  
Slope Stabilization ◽  
Soil Nails ◽  
Scale Test ◽  
Loose Fill ◽  
Fill Slope

scholarly journals Three-Dimensional Modeling of Spatial Reinforcement of Soil Nails in a Field Slope under Surcharge Loads

2013 ◽  
Vol 2013 ◽  
pp. 1-12
Author(s):  
Yuan-de Zhou ◽  
Kai Xu ◽  
Xinwei Tang ◽  
Leslie George Tham
Keyword(s):  
Field Test ◽  
Strong Dependence ◽  
Three Dimensional ◽  
Soil Nails ◽  
Spatial Reinforcement ◽  
Three Dimensional Modeling ◽  
Stability Of Slopes ◽  
Numerical Predictions ◽  
The Stability ◽  
Loose Fill

Soil nailing has been one of the most popular techniques for improving the stability of slopes, in which rows of nails and a structural grillage system connecting nail heads are commonly applied. In order to examine the spatial-reinforcement effect of soil nails in slopes, a three-dimensional (3D) numerical model has been developed and used to back-analyze a field test slope under surcharge loading. Incremental elastoplastic analyses have been performed to study the internal deformation within the slope and the development of nail forces during the application of top surcharge loads. Different treatments of the grillage constraints at nail heads have been studied. It is shown that the numerical predictions compare favorably with the field test measurements. Both the numerical and the field test results suggest that soil nails are capable of increasing the overall stability of a loose fill slope for the loading conditions considered in this study. The axial force mobilization in the two rows of soil nails presents a strong dependence on the relative distance with the central section. With the surcharge loads increased near the bearing capacity of the slope, a grillage system connecting all the nail heads can affect the stabilizing mechanism to a notable extent.

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