The light touch probe serves as an in-situ testing method for evaluating soil properties by employing a specific drop hammer energy to drive a cone-shaped probe of a certain size into the soil at varying depths. This technique provides valuable insights into the nature of the soil, helping engineers and geologists assess its composition and strength.
### Range and Usage Considerations of the Light Touch Probe
#### (1) Applications of the Light Touch Probe
The light touch probe is well-suited for a variety of soil types, including sand, cohesive soils (such as clay), artificial fills, and loose granular materials. Its versatility makes it a popular choice for field investigations where quick and reliable soil data is needed.
#### (2) Operating Procedures for Light Touch Probes
To ensure accurate results, follow these steps when conducting a light touch probe test:
1. Begin by drilling to the desired soil level using a lightweight drill.
2. Before installation, ensure the probe is assembled smoothly and that the probe hole remains vertical to prevent any deviation during testing.
3. During the testing process, allow the piercing hammer to fall freely from a height of 50 cm. Record the penetration depth after each stroke, along with the number of hammer blows required for every 10 cm of penetration. Typically, five hammer strikes constitute one full cycle.
4. If the probe's total length exceeds 2 meters, adjustments must be made to the hammer count according to relevant standards to account for additional resistance.
#### (3) Precautions for Using the Light Touch Probe
When operating the light touch probe, it is crucial to maintain consistent conditions. Ensure the hammer falls freely from a height of 50 cm, and measure the number of hammer blows (N100) for every 30 cm of penetration into the soil layer. Additionally, always check that the equipment is functioning correctly before starting the test to avoid errors or inconsistencies in your measurements.
By adhering to these guidelines, you can maximize the effectiveness of the light touch probe while minimizing potential issues during fieldwork. Remember, proper calibration and attention to detail are key components of successful soil testing using this method.
3.96mm Pitch
3.96mm Pitch
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