Soil nail system is good supporting system

In loose soil and broken rock conditions, advance reinforcement should be carried out, such as grouting and micro pile underpinning.
At present, 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. So, some main points should be noticed during installation of .
1.Before excavation, distribution, physical and mechanical property of soil layer should be
2.During construction, drilling parameter should be controlled and drilling spreed should be mastered to avoid bit burying, bit jamming, hole collapse, chip off-falling, sand gushing, hole shrinkage and being difficult for casing.
3.Installing soil nail by using drill machine and then grouting.
4.Installing soil nail should be assembled according to design requirements, inserting seriously and ensuring quality.
5.Grouting should also follow design requirements, controlling mix proportion of cement paste and cement mortar, stirring evenly, making grouting equipment and pipeline in good conditions.
6.Checking drilling diameter, depth and angle, insertion length, grouting pressure and amount, sprayed concrete thickness and strength, etc.
7.After construction completion of every segment’s support, slope top and surface displacement should be checked. If there is abnormal condition, measures should be taken to guarantee normal construction.
Quality and security of project has direct relationship with people’s life, so does soil nail support.

During excavation and support slope, soil nailing has following features:
1.The formation of soil nail compound will improve overall stability and bearing capacity of project.
2.The construction equipment is simple. The length of soil nail is shorter than anchor bolt’s, it doesn’t need to add prestress.
3.Excavation work is conducted in sections, without taking up operating time, with high-efficiency and short-period.
4.Soil nailing can be operated in small spaces, with low noise and vibration, especially having buildings around.
5.The cost of soil nailing is lower than other supporting structures.
6.Self-deformation of soil nailing is small, so it has little influence on surrounding buildings.
Based on the complexities and influences of construction conditions, geological conditions, ground loading conditions and other factors, various monitoring work should be carried out before excavation, such as: rock and soil character, supporting structure and environment conditions, etc. Then reflecting monitoring results to guide design and construction.

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