How Does the Soil Nail Retaining Wall Support the Road Slope?
by Anna S. Optimization SpecialistA
highway retaining wall is a structure used to support the roadbed fill or
cutting soil, stabilize it, and prevent it from slipping. The more common
retaining walls are gravity type, counterweight type, cantilever type, arm
type, reinforced soil type, anchor rod type, anchor plate type, etc. In
addition, there are new forms such as vertical prestressed bolt type, soil nail
type, and pile plate type.
The
soil-nailed retaining wall is a new type of retaining wall structure, which
consists of reinforced soil, soil nails placed in the soil, protective panels,
and a drainage system. The natural soil is reinforced in situ by soil nails and
combined with the shotcrete faceplate to form a gravity retaining wall, which
resists the earth pressure and other forces behind the wall, thereby
stabilizing the excavation slope. The soil nail forms a composite body by
relying on the cohesive force, frictional resistance, and surrounding soil at
the interface with the soil body. The soil nails are passively stressed under
the condition that the soil body is deformed, and the soil body is reinforced
through its tension. The deformation of the soil between the soil nails is
restrained by the protective plate.
Types of Soil Nails in Soil Nailed Walls
There
are several types of drilling grouting nails, driving nails, grouting driving
nails, and high-pressure jetting nails. Among them, drilling grouting nails are
the most commonly used type.
The Construction Process of Soil Nail Wall
Excavation: The depth
should be controlled between 1 ~ 2 m depending on the soil properties of
different properties. It can be as small as 1 m in the saturated cohesive soil
and 2 m in dry hard cohesive soil.
Install soil nails: drill
holes, set up a row of soil nails (that is, insert a row of steel bars or
anchors), set up drainage pipes, and grout, arrange steel mesh, and spray
concrete.
Similarities and Differences Between Soil Nail Wall
and Anchor Retaining Wall
1. Soil
nailing is an in-situ reinforcement technology, that is, a geotechnical
reinforcement method that improves the mechanical properties of the soil by
laying tie bars in the soil.
2. The
anchor retaining wall can choose whether to apply prestress or not. Generally,
the soil nail type retaining wall does not apply prestress. It is required that
after the soil body undergoes slight deformation, the soil nails are passively
subjected to wear resistance and formed together with the original unstable
soil body, forming a stable soil mass similar to the specific self-supporting
capacity of a gravity retaining wall.
Advantages and Disadvantages of Soil Nailing Retaining
Walls
1. The
construction equipment is light and the operation method is simple;
2. The
construction does not occupy the site alone;
3. The
construction speed is fast;
4.
Simple structure and low cost;
5. If
self-drilling soil nails are used, grouting and anchoring can be completed in
one drilling. No casing is required for construction in soft soil, loose sandy
soil and other difficult-to-form geological structures, and the construction
efficiency is high.
The soil
nail wall is a soil retaining system formed by reinforced rods and protective
panels set in the natural slope or the slope formed by excavation. It is used
to improve the in-situ soil and work together with the in-situ soil to form a
gravity Retaining wall-type light retaining structure, thereby improving the
stability of the entire slope. Compared with other retaining walls, soil-nail
walls have unique advantages.
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Created on Aug 7th 2022 21:43. Viewed 195 times.