Self-Drilling Anchor Bolt Load Testing Setups and Loading Process

Self-drilling anchor bolts' effective performance is contingent on several factors, including the adhesive properties of the interface, soil type, construction methods, and load testing setups.

Load Testing Setups for Self-Drilling Anchor Bolts

The adhesive capacity of self-drilling anchor bolts plays a fundamental role in their performance. This capacity is influenced by factors such as soil type, construction methods, grouting pressure, and hole methods. To ensure the reliability of self-drilling anchor bolts in construction projects, various load testing setups are employed:

1. Compression Load Test

This test measures the ability of self-drilling anchor bolts to withstand axial loads. It helps determine the load-bearing capacity of these bolts under compressive forces, essential for ensuring structural stability.

2. Pull-out Test

The pull-out test is indispensable when self-drilling anchor bolts are used to reinforce a project. By assessing the pull-out resistance, this test helps determine the adhesive strength between the grouting body and the self-drilling anchor bolts, as well as the shearing strength between the surrounding rocks. This is a critical step in guaranteeing the overall integrity of the anchorage.


3. Lateral Load Test

This test evaluates the performance of self-drilling anchor bolts under lateral loads. It provides valuable insights into the ability of these bolts to resist horizontal forces, an important consideration in various construction scenarios.

4. Deformation Instrumentation

Deformation instrumentation helps monitor the behavior of self-drilling anchor bolts under load and provides data for assessing their performance and long-term structural stability.

During pull-out testing, the results will reveal specific information about the self-drilling anchor bolt's load-bearing capacity:

- If self-drilling anchor bolts are pulled out from the grouting body, it indicates that the bearing capacity of the anchorage body is determined by the adhesive strength between the grouting body and the self-drilling anchor bolt.

- If self-drilling anchor bolts are pulled out with the grouting body, it signifies that the bearing capacity of the anchorage body is determined by the shearing strength between the grouting body and the surrounding rocks.

- If self-drilling anchor bolts break during the pull-out test, it suggests that the bearing capacity of the anchorage body is controlled by the tensile strength of the self-drilling anchor bolts. These comprehensive tests ensure that construction projects are not compromised by anchor bolt failures.

Therefore, it is standard practice to conduct a pull-out test during site construction to confirm the ultimate pullout capacity of self-drilling anchor bolts. This rigorous testing helps engineers and construction professionals make informed decisions about the use of self-drilling anchor bolts in their projects.

Analyzing the Loading Process of Self-Drilling Anchor Bolts

Understanding the loading process of self-drilling anchor bolts is crucial for ensuring their effectiveness in geotechnical engineering projects. This process can be divided into three stages:

1. The First Stage

At the outset of self-drilling anchor bolt installation, the grouting process is completed, but the bonding force between the grout and the soil layer has not yet fully formed. Consequently, self-drilling anchor bolts bear minimal force during this stage.

2. The Second Stage

As excavation depth increases, the slurry bonds the self-drilling anchor bolts to the stratum. Tension gradually develops within the anchor bolts, concentrating on the bonding position. The closer the anchor bolts are to the stratum, the greater the tension they experience.

3. The Third Stage

Once sufficient depth is reached, most parts of the self-drilling anchor bolts are within the slip crack range. During this stage, the internal force decreases from the middle to both sides.

When self-drilling anchor bolts reach their ultimate load-bearing capacity, various forces come into play, including grip force within the bolts, friction force between the soil and the anchor bolts, and shearing strength within the rock and soil body. It is essential to consider the friction force between the anchor bolts and the soil body when determining their bearing capacity. This consideration necessitates that the standard compressive strength of the mortar stone body should be no less than 20MPa in soil conditions and no less than 30MPa in rock conditions.


Sinorock's expertise in manufacturing self-drilling anchor bolts ensures that these crucial components perform optimally in geotechnical engineering projects. Their commitment to quality and rigorous testing procedures makes them a trusted partner for construction professionals seeking reliable anchoring solutions. If you have any needs or questions in the field of geotechnical anchoring, please feel free to contact us at

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