Soil Nail Retaining Wall Construction, Self Drilling Rock Bolt Is the Best

In foundation excavating, especially in deep foundations, a retaining wall is inevitable to prevent the slope from collapsing and ensure the workers and equipment are safe. When constructing a retaining wall, we usually use soil nails. Now, there are many types of materials that can be used as soil nails, such as steel bars, strands, self-drilling rock bolts, and others. Among these materials, the self-drilling rock bolt has been proved to be the best choice.

l  What Is Soil Nail Retaining Wall?

l  What Are Self-Drilling Rock Bolts?

l  How Was Self-Drilling Rock Bolts Used in the Soil Nail Retaining Wall?

What Is Soil Nail Retaining Wall?

Soil nail retaining wall is reinforced by natural soil nails through itself and combined with sprayed concrete panels to form a similar gravity retaining wall to resist the earth pressure behind the wall to maintain the excavation surface. The soil nail wall is set by drilling, inserting reinforcement, and grouting.

Generally, we use mortar anchor, driving angle steel, and coarse steel bar to form soil nails. The method of soil nailing wall is similar to that of the shotcrete reinforcement used in mines to reinforce rock mass, so it is also called shotcrete reinforcement slope or shotcrete retaining wall.

What Are Self-Drilling Rock Bolts?

The self-drilling rock bolt is composed of a hollow bar (which is used to grout), a drill bit (which can be selected according to the geological conditions), a coupler (which can connect several hollow bars if the single length cannot meet the requirement), a nut, a plate, and a centralizer. Unlike traditional rock bolts, it can combine drilling, grouting, and anchoring in one process.

The self-drilling rock bolt is safe, efficient, and convenient. It is suitable for broken rock, loose soil, and geological conditions where is difficult to drill holes. It helps to ensure the anchoring effect in complex ground conditions and achieve the best construction result.

Self-drilling rock bolt has a rich variety of drill bits, and the drill bit can be selected according to the properties of rock and soil.

A self-drilling rock bolt system can fill cracks, consolidate rock mass and soil layer through pressure grouting, and has good grouting spreading radius and reliable anchoring quality.

The hollow anchor bar can be cut arbitrarily and lengthened by the coupler. Therefore, it is suitable for construction in a narrow space that the large equipment cannot enter.

Self-drilling rock bolt has a faster drilling speed. When processing in the strongly weathered siltstone, it can drill about 500m per day.

It has good corrosion resistance and oxidation resistance when hot-dip galvanized or coated with resin and is suitable for coastal and other corrosive environments.

How Was Self-Drilling Rock Bolts Used in the Soil Nail Retaining Wall?

Used as soil nails, the self-drilling rock bolt is through the composite soil based on the active control mechanism to enhance the stability of the slope soil itself. It not only effectively improves the overall stiffness of the soil but also makes up for the weakness of the soil with low tensile and shear strength. Through the interaction, the structural strength potential of the soil itself is fully exerted, the deformation and failure properties of the slope are changed, and the overall stability is significantly improved. The soil nail wall not only delays the development stage of plastic deformation, but also has obvious progressive deformation and cracking failure, and the overall collapse does not occur.

Above is why we should use the self-drilling rock bolt as soil nails to reinforce the retaining wall. If you’re interested in the product, please contact us at sinorock@sinorockco.com directly and we’ll reply to you as soon as possible.