The Comparison of Several Rock Bolts for Slope Stability

Time:2022-04-14From:sinorock View:

Currently, there are various types of rock bolts for slope stability, such as rebar anchor bolt, hollow bolt, and self-drilling rock bolt. It varies according to the conditions of the slopes. Today, we will show you the advantages and disadvantages of these three kind of rock bolts for slope stability.

1. Rebar Anchor Bolt

What

Up to now, rebar anchor is the most widely used to stabilize a slope since it is very economical. The rebar anchor is just a rebar with standard thread on the surface. It is easy to produce, and the material could be bought everywhere. Therefore, if you want to save the cost of whole project and the condition is fine to drill, the rebar anchor bolt is the most recommendable choice for slope stabilization.

Construction Process

Trim Slope: At the beginning of the whole construction, we need trim the slope to ensure that no loose rock drops during the process.

Locate Drilling Position: We must calculate the total load to arrange how many rebar anchor bolts is fine, and then make sure the distance between every two anchor bolts.

Drill A Hole: By using a drilling rig, we can easily drill a hole to a required depth. Additionally, a drill rod is also needed.

Put Rock Bolt In: Pull out of the drill rod and put the rebar anchor bolt in the hole. The rebar anchor bolt should be rolled in advance.

Grout: Through a grouting machine and a grouting pipe, we can grout the slurry with the water-cement ratio 0.45~0.6:1 into the drilling hole.

When Using A Rebar Anchor?

Usually, the rebar anchor bolt can only be applied to stabilize the slopes with good conditions, which allow us to drill and grout separately.

2. Hollow Bolt

What Is A Hollow Bolt?

hollow bolt

Hollow bolt, is relatively more advanced than rebar anchor bolt because it is not only a drill rod but also a grouting pipe. It shortens the construction process, saves the construction time, reduces the cost.

How Does Hollow Bolt Work?

If you use the hollow bolt to stabilize a slope, you must first drill a hole by a drilling rod with a rig as rebar anchor bolt.

When Using A Hollow Bolt?

Similarly, the hollow bolt could be only used to reinforce the slopes with good conditions.

3. Self-drilling Rock Bolt

What Is A Self-drilling Rock Bolt?

Self-drilling anchor bolt system is the most advanced technology. It consists of a drill bit (one-time use), a hollow bar that could be cut at any point or extended by a coupler, a coupler, a plate, a nut, and a centralizer. Self-drilling anchor bolt system is widely used to stabilize unstable slopes.

self_drilling_anchor_bolt

Construction Process

Trim Slope: At the beginning of the whole construction, we need trim the slope to ensure that no loose rock drops during the process.

Locate Drilling Position: We must calculate the total load to arrange how many rebar anchor bolts is fine, and then make sure the distance between every two anchor bolts.

Simultaneous Drilling and Grouting: Because the self-drilling anchor bolt is a drilling rod, a hollow bolt, and a grouting pipe, we can drill and grouting simultaneously in one step. As a result, the construction time of the whole project will be significantly shortened.

How Does It Work?

During the drilling process of the self-drilling hollow bolt, the hollow bolt body doubles as a drill pipe and a medium transmission channel, and finally acts as a reinforcement body for geotechnical support. After drilling into the rock formation, inject cement slurry for anchoring. Cement slurry can fill rock fissures, and can consolidate loose hole walls to prevent holes from collapsing, thereby achieving better anchoring effect.

When Using A Self-drilling Rock Bolt?

Self-drilling anchor bolt system is safe, efficient and convenient. It is suitable for broken rock, loose soil and geological conditions where are difficult to drill holes. It helps to ensure anchoring effect in complex ground conditions and achieving best construction result.

Self-drilling anchor bolt is primarily used for tunnel and underground engineering, slope engineering, and ground and foundation engineering. It can be used for pre-construction support and can effectively enhance the stability of soil and rock mass.

self-drilling-anchor-bolt-application---slope-support

Finally, I want to say, each of the above three rock bolts for slope stabilization has its own advantages and disadvantages. Choosing the most proper one to finish our construction is OK.

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