2016年08月09日

Soil nail:widely used

1. The application of soil nail .
Generally speaking, soil nail is suitable for foundation excavation support and slope stabilization in artificial soil, clayey soil and weak consolidated sand. The depth of excavation should be less than 16 meters, and the depth can be increased when combining with pre-stressed anchor bolt. Soil nail should be not used in silty sand layer with rich water, sandy gravel stratum and mucky soil.
2. The exploration of project.
As for soil nail support, the previous exploration is necessary for the security of project. It includes underground pipelines and rainfall.
3. The design and monitoring.
Accurate and reasonable design is the premise of ensuring construction quality, which influences the security, construction period and investment of project. So the design should bebased on geological survey report, analyze soil property, combining theoretical analysis with project experience. During the process of construction, design parameters should be adjusted according to site conditions. Monitoring work should be also done, it includes horizontal displacement, sedimentation, soil nail stress and soil pressure, etc.

Self drilling soil nail is a kind of supporting technology in geotechnical engineering. It drills surrounding rocks with a certain distance, direction and depth, then it is put into the drill hole and at last, grouting and fixing are carried on. Soil nail has the effect of binding, combining and reinforcing surrounding rocks. It helps to improve rocks’ self-intensity and self-stability, lighten self-gravity, ensure safety and stability of projects.At present, soil nail has been widely used in foundation pit, underground anti-floating, tunnel, slope support, water conservancy and hydropower, highway bridge, etc. Its quality will directly influence security of whole project.
The function mechanism of soil nail:Soil nail and soil body can combine together and form compound body, which will promote slope stability and carrying capacity, improve ductility, avoid collapse and benefit for construction security.




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