Soil Nailing and Subsurface Drainage for Slope Stabilization

A wide range of slope stabilization and protective measures are available. Soil nailing and subsurface drainage are amongest the very commonly used techniques for slope stabilization. The concept of soil nailing involves creating a stable block of composite material by strengthening the insitu ground with soil nails. The interaction between the ground and the soil nail is complex, and the mobilization of forces in the soil nail is dependent on many factors. The mechanism of subsurface drains in slopes involves a decrease in pore water pressures in the subsoil, and consequently an increase in effective stresses and soil shear strength in the whole drained domain. This paper gives an overview of the mechanism of soil-nailed system and subsurface drainage measures and presents some geotechnological developments related to their applications.

Landslides have resulted in the loss of human lives and properties in many parts of the world. To combat landslide risk, a wide range of risk mitigation measures are available. These range from hard engineering measures of slope stabilization and landslide protective works to soft community means of public education. Stabilization works aim at reducing the likelihood of failure of a slope whereas the other measures reduces the risk by minimizing the consequences of slope failures.

The range of slope stabilization works may be categorizes as follows:
A. Surface protection and drainage,
B. Subsurface drainage,
C. Slope regrading,
D. Retaining structures,
E. Structural reinforcement,
F. Strengthening of slope-forming material,
G. Vegetation and bioengineering,
H. Removal of hazards,
I. Special materials and techniques.